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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta name="generator" content="Asciidoctor 2.0.18">
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<meta name="author" content="Peter Dimov and Matt Borland">
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<title>CharConv: An Implementation of <charconv> in C++11</title>
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<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:300,300italic,400,400italic,600,600italic%7CNoto+Serif:400,400italic,700,700italic%7CDroid+Sans+Mono:400,700">
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/*! Asciidoctor default stylesheet | MIT License | https://asciidoctor.org */
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#content h1>a.link,h2>a.link,h3>a.link,#toctitle>a.link,.sidebarblock>.content>.title>a.link,h4>a.link,h5>a.link,h6>a.link{color:#ba3925;text-decoration:none}
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details[open]>summary::before{border:solid transparent;border-top:solid;border-width:.5em .3em 0;transform:translateY(15%)}
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pre.prettyprint .linenums{line-height:1.45;margin-left:2em}
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table.linenotable{border-collapse:separate;border:0;margin-bottom:0;background:none}
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table.linenotable td[class]{color:inherit;vertical-align:top;padding:0;line-height:inherit;white-space:normal}
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table.linenotable td.code{padding-left:.75em}
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table.linenotable td.linenos,pre.pygments .linenos{border-right:1px solid;opacity:.35;padding-right:.5em;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none}
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pre.pygments span.linenos{display:inline-block;margin-right:.75em}
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.quoteblock{margin:0 1em 1.25em 1.5em;display:table}
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.quoteblock blockquote>.paragraph:last-child p{margin-bottom:0}
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.verseblock{margin:0 1em 1.25em}
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.verseblock pre{font-family:"Open Sans","DejaVu Sans",sans-serif;font-size:1.15rem;color:rgba(0,0,0,.85);font-weight:300;text-rendering:optimizeLegibility}
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.verseblock pre strong{font-weight:400}
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.verseblock .attribution{margin-top:1.25rem;margin-left:.5ex}
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p.tableblock:last-child{margin-bottom:0}
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td.tableblock>.content{margin-bottom:1.25em;word-wrap:anywhere}
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td.tableblock>.content>:last-child{margin-bottom:-1.25em}
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table.tableblock,th.tableblock,td.tableblock{border:0 solid #dedede}
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table.grid-all>*>tr>*{border-width:1px}
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table.grid-cols>*>tr>*{border-width:0 1px}
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table.grid-rows>*>tr>*{border-width:1px 0}
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table.frame-all{border-width:1px}
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table.frame-ends{border-width:1px 0}
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table.frame-sides{border-width:0 1px}
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table.frame-none>*>tr>:first-child,table.frame-ends>*>tr>:first-child{border-left-width:0}
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table.frame-none>*>tr>:last-child,table.frame-ends>*>tr>:last-child{border-right-width:0}
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table.stripes-all>*>tr,table.stripes-odd>*>tr:nth-of-type(odd),table.stripes-even>*>tr:nth-of-type(even),table.stripes-hover>*>tr:hover{background:#f8f8f7}
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th.halign-left,td.halign-left{text-align:left}
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th.halign-right,td.halign-right{text-align:right}
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th.halign-center,td.halign-center{text-align:center}
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th.valign-top,td.valign-top{vertical-align:top}
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th.valign-bottom,td.valign-bottom{vertical-align:bottom}
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th.valign-middle,td.valign-middle{vertical-align:middle}
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table thead th,table tfoot th{font-weight:bold}
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tbody tr th{background:#f7f8f7}
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tbody tr th,tbody tr th p,tfoot tr th,tfoot tr th p{color:rgba(0,0,0,.8);font-weight:bold}
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p.tableblock>code:only-child{background:none;padding:0}
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p.tableblock{font-size:1em}
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ol{margin-left:1.75em}
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ul li ol{margin-left:1.5em}
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dl dd{margin-left:1.125em}
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dl dd:last-child,dl dd:last-child>:last-child{margin-bottom:0}
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li p,ul dd,ol dd,.olist .olist,.ulist .ulist,.ulist .olist,.olist .ulist{margin-bottom:.625em}
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ul.checklist,ul.none,ol.none,ul.no-bullet,ol.no-bullet,ol.unnumbered,ul.unstyled,ol.unstyled{list-style-type:none}
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ul.no-bullet,ol.no-bullet,ol.unnumbered{margin-left:.625em}
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ul.unstyled,ol.unstyled{margin-left:0}
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li>p:empty:only-child::before{content:"";display:inline-block}
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ul.checklist>li>p:first-child{margin-left:-1em}
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ul.checklist>li>p:first-child>.fa-square-o:first-child,ul.checklist>li>p:first-child>.fa-check-square-o:first-child{width:1.25em;font-size:.8em;position:relative;bottom:.125em}
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ul.checklist>li>p:first-child>input[type=checkbox]:first-child{margin-right:.25em}
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ul.inline{display:flex;flex-flow:row wrap;list-style:none;margin:0 0 .625em -1.25em}
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ul.inline>li{margin-left:1.25em}
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.unstyled dl dt{font-weight:400;font-style:normal}
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ol.arabic{list-style-type:decimal}
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ol.decimal{list-style-type:decimal-leading-zero}
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ol.loweralpha{list-style-type:lower-alpha}
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ol.upperalpha{list-style-type:upper-alpha}
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ol.lowerroman{list-style-type:lower-roman}
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ol.upperroman{list-style-type:upper-roman}
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ol.lowergreek{list-style-type:lower-greek}
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.hdlist>table,.colist>table{border:0;background:none}
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.hdlist>table>tbody>tr,.colist>table>tbody>tr{background:none}
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td.hdlist1,td.hdlist2{vertical-align:top;padding:0 .625em}
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td.hdlist1{font-weight:bold;padding-bottom:1.25em}
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td.hdlist2{word-wrap:anywhere}
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.literalblock+.colist,.listingblock+.colist{margin-top:-.5em}
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.colist td:not([class]):first-child{padding:.4em .75em 0;line-height:1;vertical-align:top}
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.colist td:not([class]):first-child img{max-width:none}
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.colist td:not([class]):last-child{padding:.25em 0}
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.thumb,.th{line-height:0;display:inline-block;border:4px solid #fff;box-shadow:0 0 0 1px #ddd}
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.imageblock.left{margin:.25em .625em 1.25em 0}
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.imageblock.right{margin:.25em 0 1.25em .625em}
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.imageblock>.title{margin-bottom:0}
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.imageblock.thumb,.imageblock.th{border-width:6px}
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.imageblock.thumb>.title,.imageblock.th>.title{padding:0 .125em}
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.image.left,.image.right{margin-top:.25em;margin-bottom:.25em;display:inline-block;line-height:0}
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.image.left{margin-right:.625em}
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.image.right{margin-left:.625em}
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a.image{text-decoration:none;display:inline-block}
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a.image object{pointer-events:none}
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sup.footnote,sup.footnoteref{font-size:.875em;position:static;vertical-align:super}
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sup.footnote a,sup.footnoteref a{text-decoration:none}
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sup.footnote a:active,sup.footnoteref a:active{text-decoration:underline}
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#footnotes{padding-top:.75em;padding-bottom:.75em;margin-bottom:.625em}
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#footnotes hr{width:20%;min-width:6.25em;margin:-.25em 0 .75em;border-width:1px 0 0}
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#footnotes .footnote{padding:0 .375em 0 .225em;line-height:1.3334;font-size:.875em;margin-left:1.2em;margin-bottom:.2em}
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#footnotes .footnote a:first-of-type{font-weight:bold;text-decoration:none;margin-left:-1.05em}
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#footnotes .footnote:last-of-type{margin-bottom:0}
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#content #footnotes{margin-top:-.625em;margin-bottom:0;padding:.75em 0}
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div.unbreakable{page-break-inside:avoid}
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.big{font-size:larger}
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.small{font-size:smaller}
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.underline{text-decoration:underline}
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.overline{text-decoration:overline}
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.line-through{text-decoration:line-through}
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.aqua{color:#00bfbf}
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.aqua-background{background:#00fafa}
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.black{color:#000}
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.black-background{background:#000}
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.blue{color:#0000bf}
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.blue-background{background:#0000fa}
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.fuchsia{color:#bf00bf}
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.fuchsia-background{background:#fa00fa}
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.gray{color:#606060}
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.gray-background{background:#7d7d7d}
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.green{color:#006000}
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.green-background{background:#007d00}
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.lime{color:#00bf00}
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.lime-background{background:#00fa00}
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.maroon{color:#600000}
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.maroon-background{background:#7d0000}
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.navy{color:#000060}
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.navy-background{background:#00007d}
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.olive{color:#606000}
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.olive-background{background:#7d7d00}
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.purple{color:#600060}
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.purple-background{background:#7d007d}
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.red{color:#bf0000}
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.red-background{background:#fa0000}
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.silver{color:#909090}
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.silver-background{background:#bcbcbc}
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.teal{color:#006060}
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.teal-background{background:#007d7d}
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.white{color:#bfbfbf}
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.white-background{background:#fafafa}
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.yellow{color:#bfbf00}
|
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.yellow-background{background:#fafa00}
|
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span.icon>.fa{cursor:default}
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a span.icon>.fa{cursor:inherit}
|
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.admonitionblock td.icon [class^="fa icon-"]{font-size:2.5em;text-shadow:1px 1px 2px rgba(0,0,0,.5);cursor:default}
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.admonitionblock td.icon .icon-note::before{content:"\f05a";color:#19407c}
|
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.admonitionblock td.icon .icon-tip::before{content:"\f0eb";text-shadow:1px 1px 2px rgba(155,155,0,.8);color:#111}
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</head>
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<body class="article toc2 toc-left">
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<div id="header">
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<h1>CharConv: An Implementation of <charconv> in C++11</h1>
|
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<div class="details">
|
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<span id="author" class="author">Peter Dimov and Matt Borland</span><br>
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</div>
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<div id="toc" class="toc2">
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<div id="toctitle">Table of Contents</div>
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<ul class="sectlevel1">
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<li><a href="#overview">Overview</a>
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<ul class="sectlevel2">
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<li><a href="#overview_description">Description</a></li>
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<li><a href="#overview_usage_examples">Usage Examples</a></li>
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<li><a href="#overview_supported_compilers">Supported Compilers</a></li>
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</ul>
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</li>
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<li><a href="#overview_from_chars">from_chars</a>
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<ul class="sectlevel2">
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<li><a href="#from_chars_from_chars_overview">from_chars overview</a></li>
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<li><a href="#from_chars_from_chars_result">from_chars_result</a></li>
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<li><a href="#from_chars_from_chars">from_chars</a></li>
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<li><a href="#from_chars_from_chars_for_integral_types">from_chars for integral types</a></li>
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<li><a href="#from_chars_examples">Examples</a>
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<ul class="sectlevel3">
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<li><a href="#from_chars_basic_usage">Basic usage</a></li>
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<li><a href="#from_chars_hexadecimal">Hexadecimal</a></li>
|
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|
|
<li><a href="#from_chars_einval">EINVAL</a></li>
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<li><a href="#from_chars_erange">ERANGE</a></li>
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</ul>
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</li>
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</ul>
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</li>
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<li><a href="#reference">Reference</a>
|
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<ul class="sectlevel2">
|
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<li><a href="#ref_boostcharconvfrom_chars_hpp"><boost/charconv/from_chars.hpp></a>
|
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<ul class="sectlevel3">
|
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|
<li><a href="#ref_synopsis">Synopsis</a></li>
|
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</ul>
|
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</li>
|
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<li><a href="#ref_boostcharconvto_chars_hpp"><boost/charconv/to_chars.hpp></a>
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<ul class="sectlevel3">
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<li><a href="#ref_synopsis_2">Synopsis</a></li>
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</ul>
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</li>
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<li><a href="#ref_boostcharconv_hpp"><boost/charconv.hpp></a></li>
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</ul>
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</li>
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<li><a href="#copyright">Copyright and License</a></li>
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</ul>
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</div>
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</div>
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<div id="content">
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<div class="sect1">
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<h2 id="overview">Overview</h2>
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<div class="sectionbody">
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<div class="sect2">
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<h3 id="overview_description">Description</h3>
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<div class="paragraph">
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<p>Charconv is a collection of parsing functions that are locale-independent, non-allocating, and non-throwing.</p>
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</div>
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</div>
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<div class="sect2">
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<h3 id="overview_usage_examples">Usage Examples</h3>
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<div class="listingblock">
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<div class="content">
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<pre class="rouge highlight"><code data-lang="c++"><span class="cp">#include <boost/charconv.hpp>
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</span>
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<span class="k">const</span> <span class="kt">char</span><span class="o">*</span> <span class="n">buffer</span> <span class="o">=</span> <span class="s">"42"</span><span class="p">;</span>
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<span class="kt">int</span> <span class="n">v</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span>
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<span class="k">auto</span> <span class="n">r</span> <span class="o">=</span> <span class="n">boost</span><span class="o">::</span><span class="n">charconv</span><span class="o">::</span><span class="n">from_chars</span><span class="p">(</span><span class="n">buffer</span><span class="p">,</span> <span class="n">buffer</span> <span class="o">+</span> <span class="n">std</span><span class="o">::</span><span class="n">strlen</span><span class="p">(</span><span class="n">buffer</span><span class="p">),</span> <span class="n">v</span><span class="p">);</span>
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<span class="n">assert</span><span class="p">(</span><span class="n">r</span> <span class="o">==</span> <span class="mi">42</span><span class="p">);</span></code></pre>
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</div>
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</div>
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</div>
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<div class="sect2">
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<h3 id="overview_supported_compilers">Supported Compilers</h3>
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<div class="ulist">
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<ul>
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<li>
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<p>GCC 5 or later with <code>-std=c++11</code> or above</p>
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</li>
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<li>
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<p>Clang 3.9 or later with <code>-std=c++11</code> or above</p>
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</li>
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<li>
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<p>Visual Studio 2015, 2017, 2019</p>
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</li>
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</ul>
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</div>
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<div class="paragraph">
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<p>Tested on <a href="https://github.com/cppalliance/charconv/actions">Github Actions</a>.</p>
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</div>
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</div>
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</div>
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</div>
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<div class="sect1">
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<h2 id="overview_from_chars">from_chars</h2>
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<div class="sectionbody">
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<div class="sect2">
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<h3 id="from_chars_from_chars_overview">from_chars overview</h3>
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<div class="listingblock">
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<div class="content">
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<pre class="rouge highlight"><code data-lang="c++"><span class="k">struct</span> <span class="nc">from_chars_result</span>
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<span class="p">{</span>
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<span class="k">const</span> <span class="kt">char</span><span class="o">*</span> <span class="n">ptr</span><span class="p">;</span>
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<span class="kt">int</span> <span class="n">ec</span><span class="p">;</span>
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<span class="k">friend</span> <span class="k">constexpr</span> <span class="kt">bool</span> <span class="k">operator</span><span class="o">==</span><span class="p">(</span><span class="k">const</span> <span class="n">from_chars_result</span><span class="o">&</span> <span class="n">lhs</span><span class="p">,</span> <span class="k">const</span> <span class="n">from_chars_result</span><span class="o">&</span> <span class="n">rhs</span><span class="p">)</span> <span class="k">noexcept</span>
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|
<span class="k">friend</span> <span class="k">constexpr</span> <span class="kt">bool</span> <span class="k">operator</span><span class="o">!=</span><span class="p">(</span><span class="k">const</span> <span class="n">from_chars_result</span><span class="o">&</span> <span class="n">lhs</span><span class="p">,</span> <span class="k">const</span> <span class="n">from_chars_result</span><span class="o">&</span> <span class="n">rhs</span><span class="p">)</span> <span class="k">noexcept</span>
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<span class="p">}</span>
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<span class="k">template</span> <span class="o"><</span><span class="k">typename</span> <span class="nc">Integral</span><span class="p">></span>
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|
<span class="n">BOOST_CXX14_CONSTEXPR</span> <span class="n">from_chars_result</span> <span class="n">from_chars</span><span class="p">(</span><span class="k">const</span> <span class="kt">char</span><span class="o">*</span> <span class="n">first</span><span class="p">,</span> <span class="k">const</span> <span class="kt">char</span><span class="o">*</span> <span class="n">last</span><span class="p">,</span> <span class="n">Integral</span><span class="o">&</span> <span class="n">value</span><span class="p">,</span> <span class="kt">int</span> <span class="n">base</span> <span class="o">=</span> <span class="mi">10</span><span class="p">)</span> <span class="k">noexcept</span><span class="p">;</span>
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<span class="n">BOOST_CXX14_CONSTEXPR</span> <span class="n">from_chars_result</span> <span class="n">from_chars</span><span class="o"><</span><span class="kt">bool</span><span class="o">></span><span class="p">(</span><span class="k">const</span> <span class="kt">char</span><span class="o">*</span> <span class="n">first</span><span class="p">,</span> <span class="k">const</span> <span class="kt">char</span><span class="o">*</span> <span class="n">last</span><span class="p">,</span> <span class="kt">bool</span><span class="o">&</span> <span class="n">value</span><span class="p">,</span> <span class="kt">int</span> <span class="n">base</span><span class="p">)</span> <span class="o">=</span> <span class="k">delete</span><span class="p">;</span></code></pre>
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</div>
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</div>
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</div>
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<div class="sect2">
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|
|
<h3 id="from_chars_from_chars_result">from_chars_result</h3>
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|
<div class="ulist">
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<ul>
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<li>
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|
<p>ptr - points to the first character not matching the pattern, or has the value of last if all characters are successfully parsed.</p>
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</li>
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<li>
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|
<p>ec - the error code. Valid values for <cerrno> are:</p>
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|
|
<div class="ulist">
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|
<ul>
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<li>
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|
<p>0 - successful parsing</p>
|
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</li>
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<li>
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|
|
<p>EINVAL - invalid argument (e.g. parsing a negative number into an unsigned type)</p>
|
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|
</li>
|
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|
<li>
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|
|
<p>ERANGE - result out of range (e.g. overflow)</p>
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</li>
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</ul>
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</div>
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|
</li>
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<li>
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|
<p>operator== - compares the values of ptr and ec for equality</p>
|
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|
|
</li>
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|
<li>
|
|
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|
|
<p>operator!- - compares the value of ptr and ec for inequality</p>
|
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|
|
</li>
|
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|
|
|
</ul>
|
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|
</div>
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|
|
</div>
|
|
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|
|
<div class="sect2">
|
|
|
|
|
<h3 id="from_chars_from_chars">from_chars</h3>
|
|
|
|
|
<div class="ulist">
|
|
|
|
|
<ul>
|
|
|
|
|
<li>
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|
|
<p>first, last - valid range to parse</p>
|
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|
</li>
|
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|
|
<li>
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|
|
|
|
<p>value - where the output is stored upon successful parsing</p>
|
|
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|
|
</li>
|
|
|
|
|
<li>
|
|
|
|
|
<p>base - the integer base to use. Must be between 2 and 36 inclusive</p>
|
|
|
|
|
</li>
|
|
|
|
|
<li>
|
|
|
|
|
<p>from_chars for integral types is constexpr when compiled using <code>-std=c++14</code> or newer</p>
|
|
|
|
|
<div class="ulist">
|
|
|
|
|
<ul>
|
|
|
|
|
<li>
|
|
|
|
|
<p>One known exception is GCC 5 which does not support constexpr comparison of const char*.</p>
|
|
|
|
|
</li>
|
|
|
|
|
</ul>
|
|
|
|
|
</div>
|
|
|
|
|
</li>
|
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|
|
</ul>
|
|
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|
|
</div>
|
|
|
|
|
</div>
|
|
|
|
|
<div class="sect2">
|
|
|
|
|
<h3 id="from_chars_from_chars_for_integral_types">from_chars for integral types</h3>
|
|
|
|
|
<div class="ulist">
|
|
|
|
|
<ul>
|
|
|
|
|
<li>
|
|
|
|
|
<p>All built-in integral types are allowed except bool which is deleted</p>
|
|
|
|
|
</li>
|
|
|
|
|
<li>
|
|
|
|
|
<p>These function have been tested to support <code><em>int128</code> and <code>unsigned </em>int128</code> when compiling with <code>-std=gnu++11</code> or newer</p>
|
|
|
|
|
</li>
|
|
|
|
|
</ul>
|
|
|
|
|
</div>
|
|
|
|
|
</div>
|
|
|
|
|
<div class="sect2">
|
|
|
|
|
<h3 id="from_chars_examples">Examples</h3>
|
|
|
|
|
<div class="sect3">
|
|
|
|
|
<h4 id="from_chars_basic_usage">Basic usage</h4>
|
|
|
|
|
<div class="listingblock">
|
|
|
|
|
<div class="content">
|
|
|
|
|
<pre class="rouge highlight"><code data-lang="c++"><span class="k">const</span> <span class="kt">char</span><span class="o">*</span> <span class="n">buffer</span> <span class="o">=</span> <span class="s">"42"</span><span class="p">;</span>
|
|
|
|
|
<span class="kt">int</span> <span class="n">v</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span>
|
|
|
|
|
<span class="n">from_chars_result</span> <span class="n">r</span> <span class="o">=</span> <span class="n">boost</span><span class="o">::</span><span class="n">charconv</span><span class="o">::</span><span class="n">from_chars</span><span class="p">(</span><span class="n">buffer</span><span class="p">,</span> <span class="n">buffer</span> <span class="o">+</span> <span class="n">std</span><span class="o">::</span><span class="n">strlen</span><span class="p">(</span><span class="n">buffer</span><span class="p">),</span> <span class="n">v</span><span class="p">);</span>
|
|
|
|
|
<span class="n">assert</span><span class="p">(</span><span class="n">r</span><span class="p">.</span><span class="n">ec</span> <span class="o">==</span> <span class="mi">0</span><span class="p">);</span>
|
|
|
|
|
<span class="n">assert</span><span class="p">(</span><span class="n">v</span> <span class="o">==</span> <span class="mi">42</span><span class="p">);</span></code></pre>
|
|
|
|
|
</div>
|
|
|
|
|
</div>
|
|
|
|
|
</div>
|
|
|
|
|
<div class="sect3">
|
|
|
|
|
<h4 id="from_chars_hexadecimal">Hexadecimal</h4>
|
|
|
|
|
<div class="listingblock">
|
|
|
|
|
<div class="content">
|
|
|
|
|
<pre class="rouge highlight"><code data-lang="c++"><span class="k">const</span> <span class="kt">char</span><span class="o">*</span> <span class="n">buffer</span> <span class="o">=</span> <span class="s">"2a"</span><span class="p">;</span>
|
|
|
|
|
<span class="kt">unsigned</span> <span class="n">v</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span>
|
|
|
|
|
<span class="k">auto</span> <span class="n">r</span> <span class="o">=</span> <span class="n">boost</span><span class="o">::</span><span class="n">charconv</span><span class="o">::</span><span class="n">from_chars</span><span class="p">(</span><span class="n">buffer</span><span class="p">,</span> <span class="n">buffer</span> <span class="o">+</span> <span class="n">std</span><span class="o">::</span><span class="n">strlen</span><span class="p">(</span><span class="n">buffer</span><span class="p">),</span> <span class="n">v</span><span class="p">,</span> <span class="mi">16</span><span class="p">);</span>
|
|
|
|
|
<span class="n">assert</span><span class="p">(</span><span class="n">r</span><span class="p">.</span><span class="n">ec</span> <span class="o">==</span> <span class="mi">0</span><span class="p">);</span>
|
|
|
|
|
<span class="n">assert</span><span class="p">(</span><span class="n">v</span> <span class="o">==</span> <span class="mi">42</span><span class="p">);</span></code></pre>
|
|
|
|
|
</div>
|
|
|
|
|
</div>
|
|
|
|
|
</div>
|
|
|
|
|
<div class="sect3">
|
|
|
|
|
<h4 id="from_chars_einval">EINVAL</h4>
|
|
|
|
|
<div class="listingblock">
|
|
|
|
|
<div class="content">
|
|
|
|
|
<pre class="rouge highlight"><code data-lang="c++"><span class="k">const</span> <span class="kt">char</span><span class="o">*</span> <span class="n">buffer</span> <span class="o">=</span> <span class="s">"-123"</span><span class="p">;</span>
|
|
|
|
|
<span class="kt">unsigned</span> <span class="n">v</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span>
|
|
|
|
|
<span class="k">auto</span> <span class="n">r</span> <span class="o">=</span> <span class="n">boost</span><span class="o">::</span><span class="n">charconv</span><span class="o">::</span><span class="n">from_chars</span><span class="p">(</span><span class="n">buffer</span><span class="p">,</span> <span class="n">buffer</span> <span class="o">+</span> <span class="n">std</span><span class="o">::</span><span class="n">strlen</span><span class="p">(</span><span class="n">buffer</span><span class="p">),</span> <span class="n">v</span><span class="p">);</span>
|
|
|
|
|
<span class="n">assert</span><span class="p">(</span><span class="n">r</span><span class="p">.</span><span class="n">ec</span><span class="p">,</span> <span class="n">EINVAL</span><span class="p">);</span>
|
|
|
|
|
<span class="n">assert</span><span class="p">(</span><span class="n">v</span> <span class="o">==</span> <span class="mi">0</span><span class="p">);</span></code></pre>
|
|
|
|
|
</div>
|
|
|
|
|
</div>
|
|
|
|
|
<div class="paragraph">
|
|
|
|
|
<p>In the event of EINVAL v is not set by <code>from_chars</code></p>
|
|
|
|
|
</div>
|
|
|
|
|
</div>
|
|
|
|
|
<div class="sect3">
|
|
|
|
|
<h4 id="from_chars_erange">ERANGE</h4>
|
|
|
|
|
<div class="listingblock">
|
|
|
|
|
<div class="content">
|
|
|
|
|
<pre class="rouge highlight"><code data-lang="c++"><span class="k">const</span> <span class="kt">char</span><span class="o">*</span> <span class="n">buffer</span> <span class="o">=</span> <span class="s">"1234"</span><span class="p">;</span>
|
|
|
|
|
<span class="kt">unsigned</span> <span class="kt">char</span> <span class="n">v</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span>
|
|
|
|
|
<span class="k">auto</span> <span class="n">r</span> <span class="o">=</span> <span class="n">boost</span><span class="o">::</span><span class="n">charconv</span><span class="o">::</span><span class="n">from_chars</span><span class="p">(</span><span class="n">buffer</span><span class="p">,</span> <span class="n">buffer</span> <span class="o">+</span> <span class="n">std</span><span class="o">::</span><span class="n">strlen</span><span class="p">(</span><span class="n">buffer</span><span class="p">),</span> <span class="n">v</span><span class="p">);</span>
|
|
|
|
|
<span class="n">assert</span><span class="p">(</span><span class="n">r</span><span class="p">.</span><span class="n">ec</span> <span class="o">==</span> <span class="n">ERANGE</span><span class="p">);</span>
|
|
|
|
|
<span class="n">assert</span><span class="p">(</span><span class="n">v</span> <span class="o">==</span> <span class="mi">0</span><span class="p">)</span></code></pre>
|
|
|
|
|
</div>
|
|
|
|
|
</div>
|
|
|
|
|
<div class="paragraph">
|
|
|
|
|
<p>In the event of ERANGE v is not set by <code>from_chars</code></p>
|
|
|
|
|
</div>
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|
</div>
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</div>
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<div class="sect1">
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<h2 id="reference">Reference</h2>
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<div class="sectionbody">
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<div class="sect2">
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<h3 id="ref_boostcharconvfrom_chars_hpp"><boost/charconv/from_chars.hpp></h3>
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<div class="sect3">
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<h4 id="ref_synopsis">Synopsis</h4>
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<div class="listingblock">
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<div class="content">
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<pre class="rouge highlight"><code data-lang="c++"><span class="k">namespace</span> <span class="n">boost</span> <span class="p">{</span>
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<span class="k">namespace</span> <span class="n">charconv</span> <span class="p">{</span>
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<span class="k">struct</span> <span class="nc">from_chars_result</span><span class="p">;</span>
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<span class="k">template</span> <span class="o"><</span><span class="k">typename</span> <span class="nc">Integral</span><span class="p">></span>
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<span class="n">BOOST_CXX14_CONSTEXPR</span> <span class="n">from_chars_result</span> <span class="n">from_chars</span><span class="p">(</span><span class="k">const</span> <span class="kt">char</span><span class="o">*</span> <span class="n">first</span><span class="p">,</span> <span class="k">const</span> <span class="kt">char</span><span class="o">*</span> <span class="n">last</span><span class="p">,</span> <span class="n">Integral</span><span class="o">&</span> <span class="n">value</span><span class="p">,</span> <span class="kt">int</span> <span class="n">base</span> <span class="o">=</span> <span class="mi">10</span><span class="p">)</span> <span class="k">noexcept</span><span class="p">;</span>
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<span class="c1">// ...</span>
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<span class="p">}</span> <span class="c1">// namespace charconv</span>
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<span class="p">}</span> <span class="c1">// namespace boost</span></code></pre>
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</div>
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</div>
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</div>
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</div>
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<div class="sect2">
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<h3 id="ref_boostcharconvto_chars_hpp"><boost/charconv/to_chars.hpp></h3>
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<div class="sect3">
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<h4 id="ref_synopsis_2">Synopsis</h4>
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<div class="listingblock">
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<div class="content">
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<pre class="rouge highlight"><code data-lang="c++"><span class="k">namespace</span> <span class="n">boost</span> <span class="p">{</span>
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<span class="k">namespace</span> <span class="n">charconv</span> <span class="p">{</span>
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<span class="k">struct</span> <span class="nc">to_chars_result</span><span class="p">;</span>
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<span class="k">template</span><span class="o"><</span><span class="k">class</span> <span class="nc">Integral</span><span class="p">></span>
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<span class="n">to_chars_result</span> <span class="n">to_chars</span><span class="p">(</span> <span class="kt">char</span><span class="o">*</span> <span class="n">first</span><span class="p">,</span> <span class="kt">char</span><span class="o">*</span> <span class="n">last</span><span class="p">,</span> <span class="n">Integral</span> <span class="n">value</span><span class="p">,</span> <span class="kt">int</span> <span class="n">base</span> <span class="o">=</span> <span class="mi">10</span> <span class="p">);</span>
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<span class="c1">// ...</span>
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<span class="p">}</span> <span class="c1">// namespace charconv</span>
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<span class="p">}</span> <span class="c1">// namespace boost</span></code></pre>
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</div>
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</div>
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</div>
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</div>
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<div class="sect2">
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<h3 id="ref_boostcharconv_hpp"><boost/charconv.hpp></h3>
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<div class="paragraph">
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<p>This convenience header includes all headers previously
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mentioned.</p>
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</div>
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</div>
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</div>
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</div>
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<div class="sect1">
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<h2 id="copyright">Copyright and License</h2>
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<div class="sectionbody">
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<div class="paragraph">
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<p>This documentation is copyright 2022-2023 Peter Dimov and Matt Borland and is distributed under
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the <a href="http://www.boost.org/LICENSE_1_0.txt">Boost Software License, Version 1.0</a>.</p>
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</div>
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</div>
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</div>
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</div>
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<div id="footer">
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<div id="footer-text">
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Last updated 2023-01-16 08:01:11 -0800
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</div>
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<style>
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*:not(pre)>code { background: none; color: #600000; }
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:not(pre):not([class^=L])>code { background: none; color: #600000; }
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</style>
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</body>
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</html>
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Matt Borland
GitHub