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321 lines
13 KiB
C++
321 lines
13 KiB
C++
// Boost.Convert test and usage example
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// Copyright (c) 2009-2014 Vladimir Batov.
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// Use, modification and distribution are subject to the Boost Software License,
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// Version 1.0. See http://www.boost.org/LICENSE_1_0.txt.
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#include "./test.hpp"
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#include <boost/convert.hpp>
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#include <boost/convert/stream.hpp>
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#include <boost/detail/lightweight_test.hpp>
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//[stream_using
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using std::string;
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using std::wstring;
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using boost::convert;
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//]
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//[stream_cnv_namespace_shortcut
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namespace cnv = boost::cnv;
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namespace arg = boost::cnv::parameter;
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//]
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static
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void
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test_dbl_to_str()
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{
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boost::cnv::cstream cnv;
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cnv(std::fixed);
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BOOST_TEST("100.00" == convert<string>( 99.999, cnv(arg::precision = 2)).value());
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BOOST_TEST( "99.95" == convert<string>( 99.949, cnv(arg::precision = 2)).value());
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BOOST_TEST("-99.95" == convert<string>(-99.949, cnv(arg::precision = 2)).value());
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BOOST_TEST( "99.9" == convert<string>( 99.949, cnv(arg::precision = 1)).value());
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BOOST_TEST( "1.00" == convert<string>( 0.999, cnv(arg::precision = 2)).value());
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BOOST_TEST( "-1.00" == convert<string>( -0.999, cnv(arg::precision = 2)).value());
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BOOST_TEST( "0.95" == convert<string>( 0.949, cnv(arg::precision = 2)).value());
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BOOST_TEST( "-0.95" == convert<string>( -0.949, cnv(arg::precision = 2)).value());
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BOOST_TEST( "1.9" == convert<string>( 1.949, cnv(arg::precision = 1)).value());
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BOOST_TEST( "-1.9" == convert<string>( -1.949, cnv(arg::precision = 1)).value());
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}
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static
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void
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test_numbase()
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{
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//[stream_numbase_example1
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/*`The following example demonstrates the deployment of `std::dec`, `std::oct` `std::hex`
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manipulators:
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*/
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boost::cnv::cstream ccnv;
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boost::cnv::wstream wcnv;
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BOOST_TEST(convert<int>( "11", ccnv(std::hex)).value() == 17); // 11(16) = 17(10)
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BOOST_TEST(convert<int>(L"11", wcnv(std::hex)).value() == 17); // 11(16) = 17(10)
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BOOST_TEST(convert<int>( "11", ccnv(std::oct)).value() == 9); // 11(8) = 9(10)
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BOOST_TEST(convert<int>(L"11", wcnv(std::oct)).value() == 9); // 11(8) = 9(10)
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BOOST_TEST(convert<int>( "11", ccnv(std::dec)).value() == 11);
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BOOST_TEST(convert<int>(L"11", wcnv(std::dec)).value() == 11);
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BOOST_TEST(convert<string>(18, ccnv(std::hex)).value() == "12"); // 18(10) = 12(16)
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BOOST_TEST(convert<string>(10, ccnv(std::oct)).value() == "12"); // 10(10) = 12(8)
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BOOST_TEST(convert<string>(12, ccnv(std::dec)).value() == "12");
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ccnv(std::showbase);
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BOOST_TEST(convert<string>(18, ccnv(std::hex)).value() == "0x12");
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BOOST_TEST(convert<string>(10, ccnv(std::oct)).value() == "012");
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ccnv(std::uppercase);
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BOOST_TEST(convert<string>(18, ccnv(std::hex)).value() == "0X12");
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//]
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//[stream_numbase_example2
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BOOST_TEST(convert<int>("11", ccnv(arg::base = cnv::base::hex)).value() == 17);
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BOOST_TEST(convert<int>("11", ccnv(arg::base = cnv::base::oct)).value() == 9);
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BOOST_TEST(convert<int>("11", ccnv(arg::base = cnv::base::dec)).value() == 11);
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//]
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}
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static
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void
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test_boolalpha()
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{
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boost::cnv::cstream cnv;
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//[stream_boolalpha_example
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BOOST_TEST(convert<string>( true, cnv(std::boolalpha)).value() == "true");
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BOOST_TEST(convert<string>(false, cnv(std::boolalpha)).value() == "false");
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BOOST_TEST(convert<bool>( "true", cnv(std::boolalpha)).value() == true);
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BOOST_TEST(convert<bool>("false", cnv(std::boolalpha)).value() == false);
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BOOST_TEST(convert<string>( true, cnv(std::noboolalpha)).value() == "1");
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BOOST_TEST(convert<string>(false, cnv(std::noboolalpha)).value() == "0");
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BOOST_TEST(convert<bool>("1", cnv(std::noboolalpha)).value() == true);
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BOOST_TEST(convert<bool>("0", cnv(std::noboolalpha)).value() == false);
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//]
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}
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static
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void
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test_skipws()
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{
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//[stream_skipws1_example
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boost::cnv::cstream ccnv;
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boost::cnv::wstream wcnv;
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char const* const cstr_good = " 123";
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char const* const cstr_bad = " 123 "; // std::skipws only affects leading spaces.
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wchar_t const* const wstr_good = L" 123";
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wchar_t const* const wstr_bad = L" 123 ";
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ccnv(std::skipws); // Skip leading whitespaces
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wcnv(std::skipws);
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BOOST_TEST( convert<int>(cstr_good, ccnv).value() == 123);
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BOOST_TEST(!convert<int>( cstr_bad, ccnv));
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BOOST_TEST( convert<int>(wstr_good, wcnv).value() == 123);
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BOOST_TEST(!convert<int>( wstr_bad, wcnv));
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ccnv(std::noskipws); // Do not ignore leading whitespaces
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wcnv(std::noskipws);
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// All conversions fail.
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BOOST_TEST(!convert<int>(cstr_good, ccnv));
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BOOST_TEST(!convert<int>( cstr_bad, ccnv));
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BOOST_TEST(!convert<int>(wstr_good, wcnv));
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BOOST_TEST(!convert<int>( wstr_bad, wcnv));
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//]
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//[stream_skipws2_example
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ccnv(arg::skipws = true); // Skip leading whitespaces
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BOOST_TEST(convert<int>(cstr_good, ccnv).value() == 123);
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//]
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}
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static
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void
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test_width()
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{
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//[stream_width_example
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boost::cnv::cstream cnv;
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string s01 = convert<string>(12, cnv(std::setw(4))).value();
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string s02 = convert<string>(12, cnv(std::setw(5))(std::setfill('*'))).value();
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string s03 = convert<string>(12, cnv(std::setw(5))(std::setfill('*'))(std::left)).value();
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BOOST_TEST(s01 == " 12"); // Field width was set to 4.
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BOOST_TEST(s02 == "***12"); // Field width was set to 5 with the '*' filler.
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BOOST_TEST(s03 == "12***"); // Field width was set to 5 with the '*' filler and left adjustment
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/*`It needs to be remembered that `boost::cnv::stream` converter uses `std::stream` as its underlying
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conversion engine. Consequently, formatting-related behavior are driven by the `std::stream`. Namely,
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after every operation is performed, the ['default field width is restored]. The values of
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the fill character and the adjustment remain unchanged until they are modified explicitly.
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*/
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// The fill and adjustment remain '*' and 'left'.
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string s11 = convert<string>(12, cnv(arg::width = 4)).value();
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string s12 = convert<string>(12, cnv(arg::width = 5)
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(arg::fill = ' ')
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(arg::adjustment = cnv::adjustment::right)).value();
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BOOST_TEST(s11 == "12**"); // Field width was set to 4.
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BOOST_TEST(s12 == " 12"); // Field width was set to 5 with the ' ' filler.
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//]
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}
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static
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void
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test_manipulators()
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{
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boost::cnv::cstream ccnv;
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boost::cnv::wstream wcnv;
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int const hex_v01 = boost::convert<int>("FF", ccnv(std::hex)).value_or(0);
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int const hex_v02 = boost::convert<int>(L"F", wcnv(std::hex)).value_or(0);
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int const hex_v03 = boost::convert<int>("FF", ccnv(std::dec)).value_or(-5);
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int const hex_v04 = boost::convert<int>(L"F", wcnv(std::dec)).value_or(-6);
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BOOST_TEST(hex_v01 == 255); // "FF"
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BOOST_TEST(hex_v02 == 15); // L"F"
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BOOST_TEST(hex_v03 == -5); // Failed conversion
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BOOST_TEST(hex_v04 == -6); // Failed conversion
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ccnv(std::noshowbase)(std::nouppercase)(std::oct);
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BOOST_TEST(boost::convert<string>(255, ccnv).value() == "377");
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BOOST_TEST(boost::convert<string>( 15, ccnv).value() == "17");
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ccnv(std::showbase);
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BOOST_TEST(boost::convert<string>(255, ccnv).value() == "0377");
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BOOST_TEST(boost::convert<string>( 15, ccnv).value() == "017");
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ccnv(std::uppercase)(std::hex);
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BOOST_TEST(boost::convert<string>(255, ccnv).value() == "0XFF");
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BOOST_TEST(boost::convert<string>( 15, ccnv).value() == "0XF");
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ccnv(std::noshowbase)(std::nouppercase)(std::oct);
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BOOST_TEST(boost::convert<string>(255, ccnv).value() == "377");
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BOOST_TEST(boost::convert<string>( 15, ccnv).value() == "17");
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ccnv(std::showbase)(arg::uppercase = true)(arg::base = cnv::base::hex);
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BOOST_TEST(boost::convert<string>(255, ccnv).value() == "0XFF");
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BOOST_TEST(boost::convert<string>( 15, ccnv).value() == "0XF");
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}
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static
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void
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test_locale()
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{
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//[stream_locale_example1
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boost::cnv::cstream cnv;
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std::locale rus_locale;
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std::locale eng_locale;
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char const* eng_locale_name = test::cnv::is_msc ? "English_United States.1251"
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: test::cnv::is_gcc ? "en_US.UTF-8"
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: "";
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char const* rus_locale_name = test::cnv::is_msc ? "Russian_Russia.1251"
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: test::cnv::is_gcc ? "ru_RU.UTF-8"
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: "";
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char const* rus_expected = test::cnv::is_msc ? "1,235e-002"
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: test::cnv::is_gcc ? "1,235e-02" : "";
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char const* eng_expected = test::cnv::is_msc ? "1.235e-002"
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: test::cnv::is_gcc ? "1.235e-02" : "";
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char const* double_s01 = test::cnv::is_msc ? "1.2345E-002"
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: test::cnv::is_gcc ? "1.2345E-02"
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: "";
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// cnv(std::setprecision(4))(std::uppercase)(std::scientific);
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cnv(arg::precision = 4)
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(arg::uppercase = true)
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(arg::notation = cnv::notation::scientific);
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double double_v01 = convert<double>(double_s01, cnv).value();
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string double_s02 = convert<string>(double_v01, cnv).value();
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BOOST_TEST(double_s01 == double_s02);
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try { rus_locale = std::locale(rus_locale_name); }
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catch (...) { printf("Bad locale %s.\n", rus_locale_name); exit(1); }
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try { eng_locale = std::locale(eng_locale_name); }
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catch (...) { printf("Bad locale %s.\n", eng_locale_name); exit(1); }
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// cnv(std::setprecision(3))(std::nouppercase);
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cnv(arg::precision = 3)(arg::uppercase = false);
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string double_rus = convert<string>(double_v01, cnv(rus_locale)).value();
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string double_eng = convert<string>(double_v01, cnv(eng_locale)).value();
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BOOST_TEST(double_rus == rus_expected);
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BOOST_TEST(double_eng == eng_expected);
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//]
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}
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void
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test::cnv::stream_converter()
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{
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test_numbase();
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test_boolalpha();
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test_skipws();
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test_width();
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test_manipulators();
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test_locale();
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test_dbl_to_str();
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boost::cnv::cstream ccnv; // std::stringstream-based char converter
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boost::cnv::wstream wcnv; // std::stringstream-based wchar_t converter
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string const not_int_str = "not an int";
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string const std_str = "-11";
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char const* const c_str = "-12";
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wstring const wstd_str = L"-13";
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wchar_t const* const wc_str = L"-14";
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char const array_str[] = "-15";
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BOOST_TEST("377" == boost::convert<std::string>(255, ccnv(arg::base = boost::cnv::base::oct)).value());
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BOOST_TEST( "ff" == boost::convert<std::string>(255, ccnv(arg::base = boost::cnv::base::hex)).value());
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BOOST_TEST("255" == boost::convert<std::string>(255, ccnv(arg::base = boost::cnv::base::dec)).value());
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////////////////////////////////////////////////////////////////////////////
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// Testing int-to-string conversion with various string
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// containers as the fallback values.
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////////////////////////////////////////////////////////////////////////////
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string s01 = boost::convert< string>(-1, ccnv).value_or(std_str);
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string s02 = boost::convert< string>(-2, ccnv).value_or(c_str);
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wstring s03 = boost::convert<wstring>(-3, wcnv).value_or(wstd_str);
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wstring s04 = boost::convert<wstring>(-4, wcnv).value_or(wc_str);
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string s05 = boost::convert< string>(-5, ccnv).value_or(array_str);
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boost::optional< string> rs01 = boost::convert< string>(-1, ccnv);
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boost::optional< string> rs02 = boost::convert< string>(-2, ccnv);
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boost::optional<wstring> rs03 = boost::convert<wstring>(-3, wcnv);
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boost::optional<wstring> rs04 = boost::convert<wstring>(-4, wcnv);
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boost::optional< string> rs05 = boost::convert< string>(-5, ccnv);
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BOOST_TEST(s01 == "-1"); BOOST_TEST(rs01 && rs01.value() == "-1");
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BOOST_TEST(s02 == "-2"); BOOST_TEST(rs02 && rs02.value() == "-2");
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BOOST_TEST(s03 == L"-3"); BOOST_TEST(rs03 && rs03.value() == L"-3");
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BOOST_TEST(s04 == L"-4"); BOOST_TEST(rs04 && rs04.value() == L"-4");
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BOOST_TEST(s05 == "-5"); BOOST_TEST(rs05 && rs05.value() == "-5");
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////////////////////////////////////////////////////////////////////////////
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// Testing int-to-string conversion with no fallback value.
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////////////////////////////////////////////////////////////////////////////
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string s11 = boost::convert< string>(-1, ccnv).value();
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wstring s12 = boost::convert<wstring>(-2, wcnv).value();
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boost::optional< string> rs11 = boost::convert< string>(-1, ccnv);
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boost::optional<wstring> rs12 = boost::convert<wstring>(-2, wcnv);
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BOOST_TEST( s11 == "-1");
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BOOST_TEST( s12 == L"-2");
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BOOST_TEST(rs11 && rs11.value() == "-1");
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BOOST_TEST(rs12 && rs12.value() == L"-2");
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}
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