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Vladimir Prus
c2d2f1c20f Create branch to keep WIP patch for modular build.
[SVN r85883]
2013-09-25 08:12:19 +00:00
90 changed files with 159 additions and 498 deletions

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@@ -26,7 +26,7 @@
Lab</a>, <a class="last reference external" href="http://www.styleadvisor.com">Zephyr Associates, Inc.</a></td></tr>
<tr><th class="docinfo-name">Date:</th>
<td>2006-09-11</td></tr>
<tr class="field"><th class="docinfo-name">Number:</th><td class="field-body">This is a revised version of <a class="reference external" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1530.html">N1530</a>=03-0113, which was
<tr class="field"><th class="docinfo-name">Number:</th><td class="field-body">This is a revised version of <a class="reference external" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1530.html">N1530</a>=03-0113, which was
accepted for Technical Report 1 by the C++ standard
committee's library working group.</td>
</tr>
@@ -239,29 +239,29 @@ Iterator Concepts.</p>
<div class="section" id="iterator-concepts">
<h2><a class="toc-backref" href="#id18">Iterator Concepts</a></h2>
<p>This proposal is formulated in terms of the new <tt class="docutils literal"><span class="pre">iterator</span> <span class="pre">concepts</span></tt>
as proposed in <a class="reference external" href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2003/n1550.htm">n1550</a>, since user-defined and especially adapted
as proposed in <a class="reference external" href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/papers/2003/n1550.html">n1550</a>, since user-defined and especially adapted
iterators suffer from the well known categorization problems that are
inherent to the current iterator categories.</p>
<p>This proposal does not strictly depend on proposal <a class="reference external" href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2003/n1550.htm">n1550</a>, as there
<p>This proposal does not strictly depend on proposal <a class="reference external" href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/papers/2003/n1550.html">n1550</a>, as there
is a direct mapping between new and old categories. This proposal
could be reformulated using this mapping if <a class="reference external" href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2003/n1550.htm">n1550</a> was not accepted.</p>
could be reformulated using this mapping if <a class="reference external" href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/papers/2003/n1550.html">n1550</a> was not accepted.</p>
</div>
<div class="section" id="interoperability">
<h2><a class="toc-backref" href="#id19">Interoperability</a></h2>
<p>The question of iterator interoperability is poorly addressed in the
current standard. There are currently two defect reports that are
concerned with interoperability issues.</p>
<p>Issue <a class="reference external" href="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#179">179</a> concerns the fact that mutable container iterator types
<p>Issue <a class="reference external" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/lwg-defects.html#179">179</a> concerns the fact that mutable container iterator types
are only required to be convertible to the corresponding constant
iterator types, but objects of these types are not required to
interoperate in comparison or subtraction expressions. This situation
is tedious in practice and out of line with the way built in types
work. This proposal implements the proposed resolution to issue
<a class="reference external" href="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#179">179</a>, as most standard library implementations do nowadays. In other
<a class="reference external" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/lwg-defects.html#179">179</a>, as most standard library implementations do nowadays. In other
words, if an iterator type A has an implicit or user defined
conversion to an iterator type B, the iterator types are interoperable
and the usual set of operators are available.</p>
<p>Issue <a class="reference external" href="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-active.html#280">280</a> concerns the current lack of interoperability between
<p>Issue <a class="reference external" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/lwg-active.html#280">280</a> concerns the current lack of interoperability between
reverse iterator types. The proposed new reverse_iterator template
fixes the issues raised in 280. It provides the desired
interoperability without introducing unwanted overloads.</p>
@@ -422,8 +422,8 @@ member (e.g. <a class="reference internal" href="#counting"><tt class="docutils
into the temporary iterator <tt class="docutils literal"><span class="pre">p+n</span></tt>, which is destroyed when
<tt class="docutils literal"><span class="pre">operator[]</span></tt> returns.</p>
<p>Writable iterators built with <tt class="docutils literal"><span class="pre">iterator_facade</span></tt> implement the
semantics required by the preferred resolution to <a class="reference external" href="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-active.html#299">issue 299</a> and
adopted by proposal <a class="reference external" href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2003/n1550.htm">n1550</a>: the result of <tt class="docutils literal"><span class="pre">p[n]</span></tt> is an object
semantics required by the preferred resolution to <a class="reference external" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/lwg-active.html#299">issue 299</a> and
adopted by proposal <a class="reference external" href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/papers/2003/n1550.html">n1550</a>: the result of <tt class="docutils literal"><span class="pre">p[n]</span></tt> is an object
convertible to the iterator's <tt class="docutils literal"><span class="pre">value_type</span></tt>, and <tt class="docutils literal"><span class="pre">p[n]</span> <span class="pre">=</span> <span class="pre">x</span></tt> is
equivalent to <tt class="docutils literal"><span class="pre">*(p</span> <span class="pre">+</span> <span class="pre">n)</span> <span class="pre">=</span> <span class="pre">x</span></tt> (Note: This result object may be
implemented as a proxy containing a copy of <tt class="docutils literal"><span class="pre">p+n</span></tt>). This approach

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@@ -19,7 +19,7 @@
.. Version 1.9 of this ReStructuredText document corresponds to
n1530_, the paper accepted by the LWG.
.. _n1530: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1530.html
.. _n1530: http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1530.html
:copyright: Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003.
@@ -140,7 +140,7 @@ as proposed in n1550_, since user-defined and especially adapted
iterators suffer from the well known categorization problems that are
inherent to the current iterator categories.
.. _n1550: http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2003/n1550.htm
.. _n1550: http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/papers/2003/n1550.html
This proposal does not strictly depend on proposal n1550_, as there
is a direct mapping between new and old categories. This proposal
@@ -169,8 +169,8 @@ reverse iterator types. The proposed new reverse_iterator template
fixes the issues raised in 280. It provides the desired
interoperability without introducing unwanted overloads.
.. _179: http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#179
.. _280: http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-active.html#280
.. _179: http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/lwg-defects.html#179
.. _280: http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/lwg-active.html#280
Iterator Facade

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@@ -1,163 +0,0 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Language" content="en-us">
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<title>Generator Iterator Adaptor Documentation</title>
</head>
<body bgcolor="#FFFFFF" text="#000000">
<img src="../../boost.png" alt="boost.png (6897 bytes)" align="middle"
width="277" height="86">
<h1>Generator Iterator Adaptor</h1>
<p>Defined in header <a href=
"../../boost/generator_iterator.hpp">boost/generator_iterator.hpp</a></p>
<p>The generator iterator adaptor makes it easier to create custom input
iterators from 0-ary functions and function objects. The adaptor takes a
<a href="http://www.sgi.com/tech/stl/Generator.html">Generator</a> and
creates a model of <a href=
"http://www.sgi.com/tech/stl/InputIterator.html">Input Iterator</a>. Each
increment retrieves an item from the generator and makes it available to be
retrieved by dereferencing. The motivation for this iterator is that some
concepts can be more naturally expressed as a generator, while most STL
algorithms expect an iterator. An example is the <a href=
"../random/index.html">Random Number</a> library.</p>
<h2>Synopsis</h2>
<blockquote>
<pre>
namespace boost {
template &lt;class Generator&gt;
class generator_iterator_policies;
template &lt;class Generator&gt;
class generator_iterator_generator;
template &lt;class Generator&gt;
typename generator_iterator_generator&lt;Generator&gt;::type
make_generator_iterator(Generator &amp; gen);
}
</pre>
</blockquote>
<hr>
<h2>The Generator Iterator Generator Class</h2>
<p>The class generator_iterator_generator is a helper class whose purpose
is to construct a generator iterator type. The template parameter for this
class is the Generator function object type that is being wrapped. The
generator iterator adaptor only holds a reference (or pointer) to the
function object, therefore the function object must outlive the generator
iterator adaptor constructed from it.</p>
<pre>
template &lt;class Generator&gt;
class generator_iterator_generator
{
public:
typedef <i>unspecified</i> type; // the resulting generator iterator type
}
</pre>
<h3>Template Parameters</h3>
<table border summary="">
<tr>
<th>Parameter</th>
<th>Description</th>
</tr>
<tr>
<td><tt><a href=
"http://www.sgi.com/tech/stl/Generator.html">Generator</a></tt></td>
<td>The generator (0-ary function object) type being wrapped. The
return type of the function must be defined as
<tt>Generator::result_type</tt>. The function object must be a model of
<a href=
"http://www.sgi.com/tech/stl/Generator.html">Generator</a>.</td>
</tr>
</table>
<h3>Concept Model</h3>
<p>The generator iterator class is a model of <a href=
"http://www.sgi.com/tech/stl/InputIterator.html">Input Iterator</a>.</p>
<h3>Members</h3>
<p>The generator iterator implements the member functions and operators
required of the <a href=
"http://www.sgi.com/tech/stl/InputIterator.html">Input Iterator</a>
concept.<br></p>
<hr>
<h2><a name="make_generator_iterator" id="make_generator_iterator">The
Generator Iterator Object Generator</a></h2>
<p>The <tt>make_generator_iterator()</tt> function provides a convenient
way to create generator iterator objects. The function saves the user the
trouble of explicitly writing out the iterator types.</p>
<blockquote>
<pre>
template &lt;class Generator&gt;
typename generator_iterator_generator&lt;Generator&gt;::type
make_generator_iterator(Generator &amp; gen);
</pre>
</blockquote>
<hr>
<h3>Example</h3>
<p>The following program shows how <code>generator_iterator</code>
transforms a generator into an input iterator.</p>
<blockquote>
<pre>
#include &lt;iostream&gt;
#include &lt;boost/generator_iterator.hpp&gt;
class my_generator
{
public:
typedef int result_type;
my_generator() : state(0) { }
int operator()() { return ++state; }
private:
int state;
};
int main()
{
my_generator gen;
boost::generator_iterator_generator&lt;my_generator&gt;::type it = boost::make_generator_iterator(gen);
for(int i = 0; i &lt; 10; ++i, ++it)
std::cout &lt;&lt; *it &lt;&lt; std::endl;
}
</pre>
</blockquote>
<hr>
<p><a href="http://validator.w3.org/check?uri=referer"><img border="0" src=
"../../doc/images/valid-html401.png" alt="Valid HTML 4.01 Transitional"
height="31" width="88"></a></p>
<p>Revised
<!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %B, %Y" startspan -->05 December, 2006<!--webbot bot="Timestamp" endspan i-checksum="38516" --></p>
<p><i>Copyright &copy; 2001 <a href=
"http://www.boost.org/people/jens_maurer.htm">Jens Maurer</a></i></p>
<p><i>Distributed under the Boost Software License, Version 1.0. (See
accompanying file <a href="../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
copy at <a href=
"http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</a>)</i></p>
</body>
</html>

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@@ -3,7 +3,7 @@
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
.. _N1550: http://www.boost-consulting.com/writing/n1550.html
.. _N1530: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1530.html
.. _N1530: http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1530.html
:Author: David Abrahams and Jeremy Siek
:Contact: dave@boost-consulting.com, jsiek@osl.iu.edu

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@@ -242,8 +242,8 @@ member (e.g. <a class="reference external" href="counting_iterator.html"><tt cla
into the temporary iterator <tt class="docutils literal"><span class="pre">p+n</span></tt>, which is destroyed when
<tt class="docutils literal"><span class="pre">operator[]</span></tt> returns.</p>
<p>Writable iterators built with <tt class="docutils literal"><span class="pre">iterator_facade</span></tt> implement the
semantics required by the preferred resolution to <a class="reference external" href="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-active.html#299">issue 299</a> and
adopted by proposal <a class="reference external" href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2003/n1550.htm">n1550</a>: the result of <tt class="docutils literal"><span class="pre">p[n]</span></tt> is an object
semantics required by the preferred resolution to <a class="reference external" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/lwg-active.html#299">issue 299</a> and
adopted by proposal <a class="reference external" href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/papers/2003/n1550.html">n1550</a>: the result of <tt class="docutils literal"><span class="pre">p[n]</span></tt> is an object
convertible to the iterator's <tt class="docutils literal"><span class="pre">value_type</span></tt>, and <tt class="docutils literal"><span class="pre">p[n]</span> <span class="pre">=</span> <span class="pre">x</span></tt> is
equivalent to <tt class="docutils literal"><span class="pre">*(p</span> <span class="pre">+</span> <span class="pre">n)</span> <span class="pre">=</span> <span class="pre">x</span></tt> (Note: This result object may be
implemented as a proxy containing a copy of <tt class="docutils literal"><span class="pre">p+n</span></tt>). This approach

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@@ -167,9 +167,9 @@ the implementation of her iterator is free to implement an
class; it will hide the one supplied by ``iterator_facade`` from
clients of her iterator.
.. _n1550: http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2003/n1550.htm
.. _n1550: http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/papers/2003/n1550.html
.. _`issue 299`: http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-active.html#299
.. _`issue 299`: http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/lwg-active.html#299
.. _`operator arrow`:

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@@ -27,10 +27,10 @@
Lab</a>, <a class="last reference external" href="http://www.styleadvisor.com">Zephyr Associates, Inc.</a></td></tr>
<tr><th class="docinfo-name">Date:</th>
<td>2006-09-11</td></tr>
<tr class="field"><th class="docinfo-name">Number:</th><td class="field-body">This is a revised version of <a class="reference external" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1550.htm">n1550</a>=03-0133, which was
<tr class="field"><th class="docinfo-name">Number:</th><td class="field-body">This is a revised version of <a class="reference external" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1550.html">n1550</a>=03-0133, which was
accepted for Technical Report 1 by the C++ standard
committee's library working group. This proposal is a
revision of paper <a class="reference external" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2001/n1297.html">n1297</a>, <a class="reference external" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1477.html">n1477</a>, and <a class="reference external" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1531.html">n1531</a>.</td>
revision of paper <a class="reference external" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2001/n1297.html">n1297</a>, <a class="reference external" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1477.html">n1477</a>, and <a class="reference external" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1531.html">n1531</a>.</td>
</tr>
<tr><th class="docinfo-name">Copyright:</th>
<td>Copyright David Abrahams, Jeremy Siek, and Thomas Witt
@@ -127,12 +127,12 @@ requirements in the iterator categories.</p>
<td><tt class="docutils literal"><span class="pre">*i</span></tt> is convertible to <tt class="docutils literal"><span class="pre">T</span></tt></td>
</tr>
<tr><td>Forward Iterator</td>
<td><tt class="docutils literal"><span class="pre">*i</span></tt> is <tt class="docutils literal"><span class="pre">T&amp;</span></tt> (or <tt class="docutils literal"><span class="pre">const</span> <span class="pre">T&amp;</span></tt> once <a class="reference external" href="http://www.open-std.org/JTC1/SC22/WG21/docs/lwg-active.html#200">issue 200</a>
<td><tt class="docutils literal"><span class="pre">*i</span></tt> is <tt class="docutils literal"><span class="pre">T&amp;</span></tt> (or <tt class="docutils literal"><span class="pre">const</span> <span class="pre">T&amp;</span></tt> once <a class="reference external" href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/lwg-active.html#200">issue 200</a>
is resolved)</td>
</tr>
<tr><td>Random Access Iterator</td>
<td><tt class="docutils literal"><span class="pre">i[n]</span></tt> is convertible to <tt class="docutils literal"><span class="pre">T</span></tt> (also <tt class="docutils literal"><span class="pre">i[n]</span> <span class="pre">=</span> <span class="pre">t</span></tt>
is required for mutable iterators once <a class="reference external" href="http://www.open-std.org/JTC1/SC22/WG21/docs/lwg-active.html#299">issue 299</a>
is required for mutable iterators once <a class="reference external" href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/lwg-active.html#299">issue 299</a>
is resolved)</td>
</tr>
</tbody>
@@ -141,7 +141,7 @@ is resolved)</td>
single hierarchy, many useful iterators can not be appropriately
categorized. For example, <tt class="docutils literal"><span class="pre">vector&lt;bool&gt;::iterator</span></tt> is almost a
random access iterator, but the return type is not <tt class="docutils literal"><span class="pre">bool&amp;</span></tt> (see
<a class="reference external" href="http://www.open-std.org/JTC1/SC22/WG21/docs/lwg-active.html#96">issue 96</a> and Herb Sutter's paper J16/99-0008 = WG21
<a class="reference external" href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/lwg-active.html#96">issue 96</a> and Herb Sutter's paper J16/99-0008 = WG21
N1185). Therefore, the iterators of <tt class="docutils literal"><span class="pre">vector&lt;bool&gt;</span></tt> only meet the
requirements of input iterator and output iterator. This is so
nonintuitive that the C++ standard contradicts itself on this point.
@@ -344,7 +344,7 @@ approach for specifying <tt class="docutils literal"><span class="pre">operator[
direction would mean that an iterator satisfying the old Random Access
Iterator requirements would not necessarily be a model of Readable or
Writable Lvalue Iterator. Instead we have chosen a design that
matches the preferred resolution of <a class="reference external" href="http://www.open-std.org/JTC1/SC22/WG21/docs/lwg-active.html#299">issue 299</a>: <tt class="docutils literal"><span class="pre">operator[]</span></tt> is
matches the preferred resolution of <a class="reference external" href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/lwg-active.html#299">issue 299</a>: <tt class="docutils literal"><span class="pre">operator[]</span></tt> is
only required to return something convertible to the <tt class="docutils literal"><span class="pre">value_type</span></tt>
(for a Readable Iterator), and is required to support assignment
<tt class="docutils literal"><span class="pre">i[n]</span> <span class="pre">=</span> <span class="pre">t</span></tt> (for a Writable Iterator).</p>
@@ -976,7 +976,7 @@ struct random_access_traversal_tag : bidirectional_traversal_tag { };
<div class="section" id="addition-to-lib-iterator-traits">
<h2><a class="toc-backref" href="#id23">Addition to [lib.iterator.traits]</a></h2>
<p>The <tt class="docutils literal"><span class="pre">is_readable_iterator</span></tt> class
template satisfies the <a class="reference external" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1519.htm">UnaryTypeTrait</a> requirements.</p>
template satisfies the <a class="reference external" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1519.htm">UnaryTypeTrait</a> requirements.</p>
<p>Given an iterator type <tt class="docutils literal"><span class="pre">X</span></tt>, <tt class="docutils literal"><span class="pre">is_readable_iterator&lt;X&gt;::value</span></tt>
yields <tt class="docutils literal"><span class="pre">true</span></tt> if, for an object <tt class="docutils literal"><span class="pre">a</span></tt> of type <tt class="docutils literal"><span class="pre">X</span></tt>, <tt class="docutils literal"><span class="pre">*a</span></tt> is
convertible to <tt class="docutils literal"><span class="pre">iterator_traits&lt;X&gt;::value_type</span></tt>, and <tt class="docutils literal"><span class="pre">false</span></tt>
@@ -1007,7 +1007,7 @@ otherwise.</p>
</div>
<div class="section" id="footnotes">
<h1><a class="toc-backref" href="#id24">Footnotes</a></h1>
<p>The UnaryTypeTrait concept is defined in <a class="reference external" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1519.htm">n1519</a>; the LWG is
<p>The UnaryTypeTrait concept is defined in <a class="reference external" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1519.htm">n1519</a>; the LWG is
considering adding the requirement that specializations are derived
from their nested <tt class="docutils literal"><span class="pre">::type</span></tt>.</p>
<!-- LocalWords: Abrahams Siek Witt const bool Sutter's WG int UL LI href Lvalue

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@@ -38,10 +38,10 @@
.. contents:: Table of Contents
.. _n1297: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2001/n1297.html
.. _n1477: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1477.html
.. _n1531: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1531.html
.. _n1550: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1550.htm
.. _n1297: http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2001/n1297.html
.. _n1477: http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1477.html
.. _n1531: http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1531.html
.. _n1550: http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1550.html
============
Motivation
@@ -76,8 +76,8 @@ requirements in the iterator categories.
| |is resolved) |
+------------------------+-----------------------------------------------------+
.. _issue 200: http://www.open-std.org/JTC1/SC22/WG21/docs/lwg-active.html#200
.. _issue 299: http://www.open-std.org/JTC1/SC22/WG21/docs/lwg-active.html#299
.. _issue 200: http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/lwg-active.html#200
.. _issue 299: http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/lwg-active.html#299
Because iterator traversal and value access are mixed together in a
@@ -91,7 +91,7 @@ nonintuitive that the C++ standard contradicts itself on this point.
In paragraph 23.2.4/1 it says that a ``vector`` is a sequence that
supports random access iterators.
.. _issue 96: http://www.open-std.org/JTC1/SC22/WG21/docs/lwg-active.html#96
.. _issue 96: http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/lwg-active.html#96
Another difficult-to-categorize iterator is the transform iterator, an
adaptor which applies a unary function object to the dereferenced
@@ -791,7 +791,7 @@ The UnaryTypeTrait concept is defined in n1519_; the LWG is
considering adding the requirement that specializations are derived
from their nested ``::type``.
.. _n1519: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1519.htm
.. _n1519: http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1519.htm
..
LocalWords: Abrahams Siek Witt const bool Sutter's WG int UL LI href Lvalue

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@@ -165,9 +165,9 @@ the implementation of her iterator is free to implement an
class; it will hide the one supplied by `iterator_facade` from
clients of her iterator.
.. _n1550: http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2003/n1550.htm
.. _n1550: http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/papers/2003/n1550.html
.. _`issue 299`: http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-active.html#299
.. _`issue 299`: http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/lwg-active.html#299
.. _`operator arrow`:

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@@ -3,7 +3,7 @@
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
.. _N1550: http://www.boost-consulting.com/writing/n1550.html
.. _N1530: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1530.html
.. _N1530: http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1530.html
:Author: David Abrahams and Jeremy Siek
:Contact: dave@boost-consulting.com, jsiek@osl.iu.edu

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@@ -1,80 +0,0 @@
// (C) Copyright Jens Maurer 2001.
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// Revision History:
// 15 Nov 2001 Jens Maurer
// created.
// See http://www.boost.org/libs/utility/iterator_adaptors.htm for documentation.
#ifndef BOOST_ITERATOR_ADAPTOR_GENERATOR_ITERATOR_HPP
#define BOOST_ITERATOR_ADAPTOR_GENERATOR_ITERATOR_HPP
#include <boost/iterator/iterator_facade.hpp>
#include <boost/ref.hpp>
namespace boost {
template<class Generator>
class generator_iterator
: public iterator_facade<
generator_iterator<Generator>
, typename Generator::result_type
, single_pass_traversal_tag
, typename Generator::result_type const&
>
{
typedef iterator_facade<
generator_iterator<Generator>
, typename Generator::result_type
, single_pass_traversal_tag
, typename Generator::result_type const&
> super_t;
public:
generator_iterator() {}
generator_iterator(Generator* g) : m_g(g), m_value((*m_g)()) {}
void increment()
{
m_value = (*m_g)();
}
const typename Generator::result_type&
dereference() const
{
return m_value;
}
bool equal(generator_iterator const& y) const
{
return this->m_g == y.m_g && this->m_value == y.m_value;
}
private:
Generator* m_g;
typename Generator::result_type m_value;
};
template<class Generator>
struct generator_iterator_generator
{
typedef generator_iterator<Generator> type;
};
template <class Generator>
inline generator_iterator<Generator>
make_generator_iterator(Generator & gen)
{
typedef generator_iterator<Generator> result_t;
return result_t(&gen);
}
} // namespace boost
#endif // BOOST_ITERATOR_ADAPTOR_GENERATOR_ITERATOR_HPP

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@@ -1,43 +0,0 @@
#ifndef INDIRECT_REFERENCE_DWA200415_HPP
# define INDIRECT_REFERENCE_DWA200415_HPP
//
// Copyright David Abrahams 2004. Use, modification and distribution is
// subject to the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// typename indirect_reference<P>::type provides the type of *p.
//
// http://www.boost.org/libs/iterator/doc/pointee.html
//
# include <boost/detail/is_incrementable.hpp>
# include <boost/iterator/iterator_traits.hpp>
# include <boost/type_traits/remove_cv.hpp>
# include <boost/mpl/eval_if.hpp>
# include <boost/pointee.hpp>
namespace boost {
namespace detail
{
template <class P>
struct smart_ptr_reference
{
typedef typename boost::pointee<P>::type& type;
};
}
template <class P>
struct indirect_reference
: mpl::eval_if<
detail::is_incrementable<P>
, iterator_reference<P>
, detail::smart_ptr_reference<P>
>
{
};
} // namespace boost
#endif // INDIRECT_REFERENCE_DWA200415_HPP

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@@ -0,0 +1,59 @@
// iterator.hpp workarounds for non-conforming standard libraries ---------//
// (C) Copyright Beman Dawes 2000. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
// See http://www.boost.org/libs/utility for documentation.
// Revision History
// 12 Jan 01 added <cstddef> for std::ptrdiff_t (Jens Maurer)
// 28 Jun 00 Workarounds to deal with known MSVC bugs (David Abrahams)
// 26 Jun 00 Initial version (Jeremy Siek)
#ifndef BOOST_ITERATOR_HPP
#define BOOST_ITERATOR_HPP
#include <iterator>
#include <cstddef> // std::ptrdiff_t
#include <boost/config.hpp>
namespace boost
{
# if defined(BOOST_NO_STD_ITERATOR) && !defined(BOOST_MSVC_STD_ITERATOR)
template <class Category, class T,
class Distance = std::ptrdiff_t,
class Pointer = T*, class Reference = T&>
struct iterator
{
typedef T value_type;
typedef Distance difference_type;
typedef Pointer pointer;
typedef Reference reference;
typedef Category iterator_category;
};
# else
// declare iterator_base in namespace detail to work around MSVC bugs which
// prevent derivation from an identically-named class in a different namespace.
namespace detail {
template <class Category, class T, class Distance, class Pointer, class Reference>
# if !defined(BOOST_MSVC_STD_ITERATOR)
struct iterator_base : std::iterator<Category, T, Distance, Pointer, Reference> {};
# else
struct iterator_base : std::iterator<Category, T, Distance>
{
typedef Reference reference;
typedef Pointer pointer;
typedef Distance difference_type;
};
# endif
}
template <class Category, class T, class Distance = std::ptrdiff_t,
class Pointer = T*, class Reference = T&>
struct iterator : boost::detail::iterator_base<Category, T, Distance, Pointer, Reference> {};
# endif
} // namespace boost
#endif // BOOST_ITERATOR_HPP

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@@ -76,7 +76,6 @@ struct iterator_writability_disabled
// Due to changeset 21683, this now never results in a category convertible
// to output_iterator_tag.
//
// Change at: https://svn.boost.org/trac/boost/changeset/21683
template <class Traversal, class ValueParam, class Reference>
struct iterator_facade_default_category
: mpl::eval_if<

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@@ -1,6 +1,7 @@
// (C) Copyright David Abrahams 2002.
// (C) Copyright Jeremy Siek 2002.
// (C) Copyright Thomas Witt 2002.
// (C) copyright Jeffrey Lee Hellrung, Jr. 2012.
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
@@ -13,6 +14,7 @@
#include <boost/iterator/detail/facade_iterator_category.hpp>
#include <boost/iterator/detail/enable_if.hpp>
#include <boost/iterator/detail/operator_brackets_dispatch.hpp>
#include <boost/static_assert.hpp>
#include <boost/utility/addressof.hpp>
@@ -75,7 +77,7 @@ namespace boost
, Return
, int[3]
>::type type;
};
};
#else
: ::boost::iterators::enable_if<
mpl::or_<
@@ -85,7 +87,7 @@ namespace boost
, Return
>
{};
#endif
#endif
//
// Generates associated types for an iterator_facade with the
@@ -94,7 +96,7 @@ namespace boost
template <
class ValueParam
, class CategoryOrTraversal
, class Reference
, class Reference
, class Difference
>
struct iterator_facade_types
@@ -102,16 +104,16 @@ namespace boost
typedef typename facade_iterator_category<
CategoryOrTraversal, ValueParam, Reference
>::type iterator_category;
typedef typename remove_const<ValueParam>::type value_type;
// Not the real associated pointer type
typedef typename mpl::eval_if<
boost::detail::iterator_writability_disabled<ValueParam,Reference>
, add_pointer<const value_type>
, add_pointer<value_type>
>::type pointer;
# if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) \
&& (BOOST_WORKAROUND(_STLPORT_VERSION, BOOST_TESTED_AT(0x452)) \
|| BOOST_WORKAROUND(BOOST_DINKUMWARE_STDLIB, BOOST_TESTED_AT(310))) \
@@ -157,7 +159,7 @@ namespace boost
private:
mutable value_type stored_value;
};
//
// In general, we can't determine that such an iterator isn't
// writable -- we also need to store a copy of the old iterator so
@@ -209,7 +211,7 @@ namespace boost
{
return stored_iterator;
}
private:
mutable value_type stored_value;
Iterator stored_iterator;
@@ -221,7 +223,7 @@ namespace boost
struct is_non_proxy_reference_impl
{
static Reference r;
template <class R>
static typename mpl::if_<
is_convertible<
@@ -231,17 +233,17 @@ namespace boost
, char[1]
, char[2]
>::type& helper(R const&);
BOOST_STATIC_CONSTANT(bool, value = sizeof(helper(r)) == 1);
};
template <class Reference, class Value>
struct is_non_proxy_reference
: mpl::bool_<
is_non_proxy_reference_impl<Reference, Value>::value
>
{};
# else
# else
template <class Reference, class Value>
struct is_non_proxy_reference
: is_convertible<
@@ -250,8 +252,8 @@ namespace boost
, Value const volatile*
>
{};
# endif
# endif
// A metafunction to choose the result type of postfix ++
//
// Because the C++98 input iterator requirements say that *r++ has
@@ -273,7 +275,7 @@ namespace boost
mpl::and_<
// A proxy is only needed for readable iterators
is_convertible<Reference,Value const&>
// No multipass iterator can have values that disappear
// before positions can be re-visited
, mpl::not_<
@@ -296,7 +298,7 @@ namespace boost
// standard's requirements. If *i is not a reference type, we must still
// produce an lvalue to which a pointer can be formed. We do that by
// returning a proxy object containing an instance of the reference object.
template <class Reference, class Pointer>
template <class Reference>
struct operator_arrow_dispatch // proxy references
{
struct proxy
@@ -315,10 +317,10 @@ namespace boost
}
};
template <class T, class Pointer>
struct operator_arrow_dispatch<T&, Pointer> // "real" references
template <class T>
struct operator_arrow_dispatch<T&> // "real" references
{
typedef Pointer result_type;
typedef T* result_type;
static result_type apply(T& x)
{
return boost::addressof(x);
@@ -328,79 +330,12 @@ namespace boost
# if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
// Deal with ETI
template<>
struct operator_arrow_dispatch<int, int>
struct operator_arrow_dispatch<int>
{
typedef int result_type;
};
# endif
// A proxy return type for operator[], needed to deal with
// iterators that may invalidate referents upon destruction.
// Consider the temporary iterator in *(a + n)
template <class Iterator>
class operator_brackets_proxy
{
// Iterator is actually an iterator_facade, so we do not have to
// go through iterator_traits to access the traits.
typedef typename Iterator::reference reference;
typedef typename Iterator::value_type value_type;
public:
operator_brackets_proxy(Iterator const& iter)
: m_iter(iter)
{}
operator reference() const
{
return *m_iter;
}
operator_brackets_proxy& operator=(value_type const& val)
{
*m_iter = val;
return *this;
}
private:
Iterator m_iter;
};
// A metafunction that determines whether operator[] must return a
// proxy, or whether it can simply return a copy of the value_type.
template <class ValueType, class Reference>
struct use_operator_brackets_proxy
: mpl::not_<
mpl::and_<
// Really we want an is_copy_constructible trait here,
// but is_POD will have to suffice in the meantime.
boost::is_POD<ValueType>
, iterator_writability_disabled<ValueType,Reference>
>
>
{};
template <class Iterator, class Value, class Reference>
struct operator_brackets_result
{
typedef typename mpl::if_<
use_operator_brackets_proxy<Value,Reference>
, operator_brackets_proxy<Iterator>
, Value
>::type type;
};
template <class Iterator>
operator_brackets_proxy<Iterator> make_operator_brackets_result(Iterator const& iter, mpl::true_)
{
return operator_brackets_proxy<Iterator>(iter);
}
template <class Iterator>
typename Iterator::value_type make_operator_brackets_result(Iterator const& iter, mpl::false_)
{
return *iter;
}
struct choose_difference_type
{
template <class I1, class I2>
@@ -414,13 +349,13 @@ namespace boost
, typename I1::difference_type
, typename I2::difference_type
>
# else
# else
mpl::eval_if<
is_convertible<I2,I1>
, iterator_difference<I1>
, iterator_difference<I2>
>
# endif
# endif
{};
};
@@ -438,7 +373,7 @@ namespace boost
operator op( \
iterator_facade<Derived1, V1, TC1, Reference1, Difference1> const& lhs \
, iterator_facade<Derived2, V2, TC2, Reference2, Difference2> const& rhs)
# else
# else
# define BOOST_ITERATOR_FACADE_INTEROP_HEAD(prefix, op, result_type) \
template < \
class Derived1, class V1, class TC1, class Reference1, class Difference1 \
@@ -451,7 +386,7 @@ namespace boost
operator op( \
iterator_facade<Derived1, V1, TC1, Reference1, Difference1> const& lhs \
, iterator_facade<Derived2, V2, TC2, Reference2, Difference2> const& rhs)
# endif
# endif
# define BOOST_ITERATOR_FACADE_PLUS_HEAD(prefix,args) \
template <class Derived, class V, class TC, class R, class D> \
@@ -468,12 +403,12 @@ namespace boost
//
class iterator_core_access
{
# if defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS)
# if defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS)
// Tasteless as this may seem, making all members public allows member templates
// to work in the absence of member template friends.
public:
# else
template <class I, class V, class TC, class R, class D> friend class iterator_facade;
# define BOOST_ITERATOR_FACADE_RELATION(op) \
@@ -616,14 +551,15 @@ namespace boost
> associated_types;
typedef boost::detail::operator_arrow_dispatch<
Reference
, typename associated_types::pointer
> operator_arrow_dispatch_;
Reference> operator_arrow_dispatch_;
typedef typename boost::detail::operator_brackets_dispatch<
Derived, Value, Reference>::type operator_brackets_dispatch_;
protected:
// For use by derived classes
typedef iterator_facade<Derived,Value,CategoryOrTraversal,Reference,Difference> iterator_facade_;
public:
typedef typename associated_types::value_type value_type;
@@ -643,16 +579,11 @@ namespace boost
{
return operator_arrow_dispatch_::apply(*this->derived());
}
typename boost::detail::operator_brackets_result<Derived,Value,reference>::type
typename operator_brackets_dispatch_::result_type
operator[](difference_type n) const
{
typedef boost::detail::use_operator_brackets_proxy<Value,Reference> use_proxy;
return boost::detail::make_operator_brackets_result<Derived>(
this->derived() + n
, use_proxy()
);
return operator_brackets_dispatch_::apply(this->derived() + n);
}
Derived& operator++()
@@ -671,7 +602,7 @@ namespace boost
return tmp;
}
# endif
Derived& operator--()
{
iterator_core_access::decrement(this->derived());
@@ -726,14 +657,14 @@ namespace boost
{
typename boost::detail::postfix_increment_result<I,V,R,TC>::type
tmp(*static_cast<I*>(&i));
++i;
return tmp;
}
# endif
# endif
//
// Comparison operator implementation. The library supplied operators
// enables the user to provide fully interoperable constant/mutable

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@@ -25,6 +25,7 @@
# include <boost/static_assert.hpp>
# include <boost/concept_archetype.hpp> // for detail::dummy_constructor
# include <boost/implicit_cast.hpp>
# include <boost/type_traits/broken_compiler_spec.hpp>
namespace boost {
@@ -40,6 +41,8 @@ struct dummyT {
}
BOOST_TT_BROKEN_COMPILER_SPEC(boost::dummyT)
namespace boost {
// Tests whether type Iterator satisfies the requirements for a

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@@ -1,63 +0,0 @@
//
// Copyright 2014 Peter Dimov
//
// Distributed under the Boost Software License, Version 1.0.
// See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt
//
#include <boost/generator_iterator.hpp>
#include <boost/detail/lightweight_test.hpp>
#include <algorithm>
class X
{
private:
int v;
public:
typedef int result_type;
X(): v( 0 )
{
}
int operator()()
{
return ++v;
}
};
template<class InputIterator, class Size, class OutputIterator> OutputIterator copy_n( InputIterator first, Size n, OutputIterator result )
{
while( n-- > 0 )
{
*result++ = *first++;
}
return result;
}
void copy_test()
{
X x;
boost::generator_iterator<X> in( &x );
int const N = 4;
int v[ N ] = { 0 };
::copy_n( in, 4, v );
BOOST_TEST_EQ( v[0], 1 );
BOOST_TEST_EQ( v[1], 2 );
BOOST_TEST_EQ( v[2], 3 );
BOOST_TEST_EQ( v[3], 4 );
}
int main()
{
copy_test();
return boost::report_errors();
}

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@@ -27,6 +27,8 @@ struct my_ptr {
// typedef boost::no_traversal_tag iterator_category;
};
BOOST_TT_BROKEN_COMPILER_SPEC(my_ptr)
BOOST_TT_BROKEN_COMPILER_SPEC(zow)
// Borland 5.6.4 and earlier drop const all over the place, so this
// test will fail in the lines marked with (**)
@@ -80,7 +82,7 @@ int main()
typedef boost::indirect_iterator<char**, int, std::random_access_iterator_tag, long&, short> Iter;
STATIC_ASSERT_SAME(Iter::value_type, int);
STATIC_ASSERT_SAME(Iter::reference, long&);
STATIC_ASSERT_SAME(Iter::pointer, int*);
STATIC_ASSERT_SAME(Iter::pointer, long*);
STATIC_ASSERT_SAME(Iter::difference_type, short);
}
return 0;

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@@ -27,6 +27,8 @@
#include <boost/mpl/has_xxx.hpp>
#include <boost/type_traits/broken_compiler_spec.hpp>
#include <boost/detail/lightweight_test.hpp>
#include <vector>
@@ -51,6 +53,7 @@ template <int I> struct see_val;
struct my_iterator_tag : public std::random_access_iterator_tag { };
using boost::dummyT;
BOOST_TT_BROKEN_COMPILER_SPEC(boost::shared_ptr<dummyT>)
typedef std::vector<int> storage;
typedef std::vector<int*> pointer_ra_container;

0
test/interoperable.cpp Executable file → Normal file
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@@ -7,6 +7,7 @@
#include <iostream>
#include <boost/static_assert.hpp>
#include <boost/noncopyable.hpp>
#include <boost/type_traits/broken_compiler_spec.hpp>
#include <boost/iterator/is_lvalue_iterator.hpp>
#include <boost/iterator.hpp>
@@ -19,6 +20,7 @@ struct v
~v();
};
BOOST_TT_BROKEN_COMPILER_SPEC(v)
struct value_iterator : boost::iterator<std::input_iterator_tag,v>
{
@@ -81,6 +83,8 @@ struct constant_lvalue_iterator
constant_lvalue_iterator operator++(int);
};
BOOST_TT_BROKEN_COMPILER_SPEC(proxy_iterator<v>::proxy)
BOOST_TT_BROKEN_COMPILER_SPEC(proxy_iterator<int>::proxy)
int main()
{

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@@ -7,6 +7,7 @@
#include <iostream>
#include <boost/static_assert.hpp>
#include <boost/noncopyable.hpp>
#include <boost/type_traits/broken_compiler_spec.hpp>
#include <boost/iterator/is_readable_iterator.hpp>
#include <boost/iterator.hpp>
@@ -19,6 +20,7 @@ struct v
~v();
};
BOOST_TT_BROKEN_COMPILER_SPEC(v)
struct value_iterator : boost::iterator<std::input_iterator_tag,v>
{
@@ -69,6 +71,7 @@ struct proxy_iterator2 : boost::iterator<std::output_iterator_tag,v>
proxy operator*() const;
};
BOOST_TT_BROKEN_COMPILER_SPEC(proxy_iterator::proxy)
int main()
{

0
test/iter_archetype_default_ctor.cpp Executable file → Normal file
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@@ -19,6 +19,8 @@
#endif
#include <boost/pending/iterator_tests.hpp>
# include <boost/type_traits/broken_compiler_spec.hpp>
# include <boost/detail/lightweight_test.hpp>
#include <stdlib.h>

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@@ -35,6 +35,7 @@ struct X {
template <class T> operator T&() const;
};
BOOST_TT_BROKEN_COMPILER_SPEC(X)
int main()
{

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@@ -7,10 +7,13 @@
#include "static_assert_same.hpp"
#include <boost/type_traits/broken_compiler_spec.hpp>
#include <boost/iterator/detail/minimum_category.hpp>
struct X { int a; };
BOOST_TT_BROKEN_COMPILER_SPEC(X)
struct Xiter : boost::iterator_adaptor<Xiter,X*>
{