375 lines
13 KiB
C++
375 lines
13 KiB
C++
// Boost.Convert test and usage example
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// Copyright (c) 2022 Dvir Yitzchaki.
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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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#if !defined(BOOST_CONVERT_CXX14) || defined(BOOST_NO_CXX17_HDR_CHARCONV)
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int main(int, char const* []) { return 0; }
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#else
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#include <boost/convert.hpp>
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#include <boost/convert/charconv.hpp>
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#include <cstdio>
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#include <cstdlib>
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#include <stdlib.h>
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#include <boost/convert.hpp>
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#include <boost/convert/printf.hpp>
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#include <boost/convert/stream.hpp>
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#include <boost/random/mersenne_twister.hpp>
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#include <boost/random/uniform_int_distribution.hpp>
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#include <boost/random/uniform_01.hpp>
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#include <boost/lexical_cast.hpp>
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#include <boost/utility/string_view.hpp>
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//[charconv_basic_deployment_header
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#include <boost/convert.hpp>
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#include <boost/convert/charconv.hpp>
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using std::string;
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using boost::convert;
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namespace cnv = boost::cnv;
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namespace arg = boost::cnv::parameter;
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struct cnv::by_default : boost::cnv::charconv {};
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//]
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static
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void
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test_str_to_uint()
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{
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string const bad_str = "not an int";
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string const neg_str = "-11";
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string const std_str = "11";
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char const* const c_str = "12";
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boost::string_view v_str = boost::string_view(c_str, 1);
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unsigned int const imax = (std::numeric_limits<unsigned int>::max)();
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unsigned long int const lmax = (std::numeric_limits<unsigned long int>::max)();
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std::string const imax_str = boost::lexical_cast<std::string>(imax);
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std::string const lmax_str = boost::lexical_cast<std::string>(lmax);
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BOOST_TEST( 0 == convert<unsigned int>(bad_str).value_or(0));
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BOOST_TEST( 0 == convert<unsigned int>(neg_str).value_or(0));
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BOOST_TEST( 0 == convert<unsigned long int>(neg_str).value_or(0));
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BOOST_TEST( 0 == convert<unsigned long int>(neg_str).value_or(0));
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BOOST_TEST(11 == convert<unsigned int>(std_str).value());
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BOOST_TEST(12 == convert<unsigned int>( c_str).value());
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BOOST_TEST( 1 == convert<unsigned int>( v_str).value_or(0));
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BOOST_TEST(11 == convert<unsigned long int>(std_str).value());
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BOOST_TEST(12 == convert<unsigned long int>( c_str).value());
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BOOST_TEST(imax == convert< unsigned int>(imax_str).value());
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BOOST_TEST(lmax == convert<unsigned long int>(lmax_str).value());
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}
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static
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void
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test_str_to_int()
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{
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//[charconv_basic_deployment
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string const bad_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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boost::string_view v_str = boost::string_view(c_str, 2);
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BOOST_TEST( -1 == convert<int>(bad_str).value_or(-1));
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BOOST_TEST(-11 == convert<int>(std_str).value());
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BOOST_TEST(-12 == convert<int>( c_str).value());
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BOOST_TEST( -1 == convert<int>( v_str).value_or(0));
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//]
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}
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static
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void
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test_int_to_str()
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{
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short const s_int = -123;
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int const i_int = -123;
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long const l_int = -123;
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long long const ll_int = -123;
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BOOST_TEST( "-123" == convert< std::string> ( s_int).value());
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BOOST_TEST( "-123" == convert< std::string> ( i_int).value());
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BOOST_TEST( "-123" == convert< std::string> ( l_int).value());
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BOOST_TEST( "-123" == convert< std::string> (ll_int).value());
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int const imin = (std::numeric_limits<int>::min)();
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int const imax = (std::numeric_limits<int>::max)();
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long int const lmin = (std::numeric_limits<long int>::min)();
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long int const lmax = (std::numeric_limits<long int>::max)();
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long long int const llmin = (std::numeric_limits<long long int>::min)();
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long long int const llmax = (std::numeric_limits<long long int>::max)();
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std::string const imin_str = boost::lexical_cast<std::string>(imin);
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std::string const imax_str = boost::lexical_cast<std::string>(imax);
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std::string const lmin_str = boost::lexical_cast<std::string>(lmin);
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std::string const lmax_str = boost::lexical_cast<std::string>(lmax);
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std::string const llmin_str = boost::lexical_cast<std::string>(llmin);
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std::string const llmax_str = boost::lexical_cast<std::string>(llmax);
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BOOST_TEST( imin_str == convert<std::string>( imin).value());
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BOOST_TEST( imax_str == convert<std::string>( imax).value());
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BOOST_TEST( lmin_str == convert<std::string>( lmin).value());
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BOOST_TEST( lmax_str == convert<std::string>( lmax).value());
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BOOST_TEST(llmin_str == convert<std::string>(llmin).value());
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BOOST_TEST(llmax_str == convert<std::string>(llmax).value());
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}
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static
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void
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test_uint_to_str()
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{
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unsigned short const us_int = 123;
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unsigned int const ui_int = 123;
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unsigned long const ul_int = 123;
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unsigned long long const ull_int = 123;
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BOOST_TEST( "123" == convert< std::string> ( us_int).value());
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BOOST_TEST( "123" == convert< std::string> ( ui_int).value());
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BOOST_TEST( "123" == convert< std::string> ( ul_int).value());
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BOOST_TEST( "123" == convert< std::string> (ull_int).value());
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unsigned int const uimax = (std::numeric_limits<unsigned int>::max)();
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unsigned long int const ulmax = (std::numeric_limits<unsigned long int>::max)();
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unsigned long long int const ullmax = (std::numeric_limits<unsigned long long int>::max)();
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std::string const uimax_str = boost::lexical_cast<std::string>( uimax);
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std::string const ulmax_str = boost::lexical_cast<std::string>( ulmax);
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std::string const ullmax_str = boost::lexical_cast<std::string>(ullmax);
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BOOST_TEST( uimax_str == convert<std::string>( uimax).value());
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BOOST_TEST( ulmax_str == convert<std::string>( ulmax).value());
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BOOST_TEST(ullmax_str == convert<std::string>(ullmax).value());
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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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//[charconv_width
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boost::cnv::charconv cnv;
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string s01 = convert<string>( 12, cnv(arg::width = 4)).value();
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string s02 = convert<string>( 12, cnv(arg::width = 5)
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(arg::fill = '*')).value();
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string s03 = convert<string>( 12, cnv(arg::width = 5)
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(arg::fill = 'x')
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(arg::adjust = cnv::adjust::left)).value();
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string s04 = convert<string>(-98, cnv(arg::width = 6)
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(arg::fill = 'Z')
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(arg::adjust = cnv::adjust::right)).value();
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string s05 = convert<string>(-12.3451, cnv(arg::precision = 2)
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(arg::width = 10)
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(arg::fill = '*')
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(arg::adjust = cnv::adjust::left)).value();
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string s06 = convert<string>(-12.3450, cnv(arg::adjust = cnv::adjust::right)).value();
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string s07 = convert<string>(-12.3450, cnv(arg::adjust = cnv::adjust::center)).value();
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BOOST_TEST(s01 == " 12");
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BOOST_TEST(s02 == "***12");
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BOOST_TEST(s03 == "12xxx");
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BOOST_TEST(s04 == "ZZZ-98");
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BOOST_TEST(s05 == "-12.35****");
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BOOST_TEST(s06 == "****-12.35");
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BOOST_TEST(s07 == "**-12.35**");
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//]
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}
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static
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void
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test_base()
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{
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//[charconv_numeric_base
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boost::cnv::charconv cnv;
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BOOST_TEST( "11111110" == convert< string>(254, cnv(arg::base = cnv::base::bin)).value());
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BOOST_TEST( "254" == convert< string>(254, cnv(arg::base = cnv::base::dec)).value());
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BOOST_TEST( "fe" == convert< string>(254, cnv(arg::base = cnv::base::hex)).value());
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BOOST_TEST( "376" == convert< string>(254, cnv(arg::base = cnv::base::oct)).value());
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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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//[charconv_skipws
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boost::cnv::charconv cnv;
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BOOST_TEST(-1 == convert<int>( " 12", cnv(arg::skipws = false)).value_or(-1));
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BOOST_TEST(12 == convert<int>( " 12", cnv(arg::skipws = true)).value_or(-1));
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//]
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}
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static
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void
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test_notation()
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{
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//[charconv_notation
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boost::cnv::charconv cnv;
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BOOST_TEST( "-3.14159" == convert<string>(-3.14159, cnv(arg::notation = cnv::notation::fixed)(arg::precision = 5)).value());
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BOOST_TEST("-3.142e+00" == convert<string>(-3.14159, cnv(arg::notation = cnv::notation::scientific)(arg::precision = 3)).value());
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BOOST_TEST("-1.9220p+1" == convert<string>(-3.14159, cnv(arg::notation = cnv::notation::hex)(arg::precision = 4)).value());
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//]
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}
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static
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void
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dbl_to_str_example()
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{
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//[charconv_precision
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boost::cnv::charconv cnv;
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BOOST_TEST( "12.3" == convert<string>(12.3456, cnv(arg::precision = 1)).value());
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BOOST_TEST( "12.35" == convert<string>(12.3456, cnv(arg::precision = 2)).value());
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BOOST_TEST("12.346" == convert<string>(12.3456, cnv(arg::precision = 3)).value());
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BOOST_TEST( "-12.3" == convert<string>(-12.3456, cnv(arg::precision = 1)).value());
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BOOST_TEST( "-12.35" == convert<string>(-12.3456, cnv(arg::precision = 2)).value());
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BOOST_TEST("-12.346" == convert<string>(-12.3456, cnv(arg::precision = 3)).value());
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//]
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}
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static
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std::pair<double, int>
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get_random()
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{
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namespace rdm = boost::random;
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static rdm::mt19937 gen (::time(0));
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static rdm::uniform_int_distribution<> precision (0, 6);
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static rdm::uniform_int_distribution<> int_part (0, SHRT_MAX);
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static rdm::uniform_01<double> fraction; // uniform double in [0,1)
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static bool sign;
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double dbl = (int_part(gen) + fraction(gen)) * ((sign = !sign) ? 1 : -1);
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// printf("%.12f\n", dbl);
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return std::make_pair(dbl, precision(gen));
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}
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static
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void
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compare(std::pair<double, int> pair)
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{
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boost::cnv::charconv cnv1;
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boost::cnv::printf cnv2;
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string s1 = convert<string>(pair.first, cnv1(arg::precision = pair.second)).value();
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string s2 = convert<string>(pair.first, cnv2(arg::precision = pair.second)).value();
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if (s1 != s2)
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printf("dbl=%.12f(%d).charconv/printf=%s/%s.\n", pair.first, pair.second, s1.c_str(), s2.c_str());
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}
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static
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void
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test_str_to_dbl()
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{
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char const* const c_str = "1.23456";
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BOOST_TEST(1.2 == convert<double>(boost::string_view(c_str, 3)).value_or(0));
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BOOST_TEST(1.23 == convert<double>(boost::string_view(c_str, 4)).value_or(0));
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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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// double round_up_abs01 = ::rint(-0.5);
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// double round_up_abs02 = ::round(-0.5);
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// double round_up_abs11 = ::rint(0.5);
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// double round_up_abs12 = ::round(0.5);
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// double huge_v = 987654321098765432109.123;
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//
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// printf("%f\n", huge_v);
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// string huge = convert<string>(huge_v, cnv1(arg::precision = 2)).value();
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// printf("%s\n", huge.c_str());
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int const num_tries = 1000000;
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double const dbls[] = { 0.90, 1.0, 1.1, 0.94, 0.96, 1.04, 1.05, 1.06, 9.654, 999.888 };
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int const num_dbls = sizeof(dbls) / sizeof(dbls[0]);
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printf("cnv::charconv::%s: started with %d random numbers...\n", __FUNCTION__, num_tries);
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BOOST_TEST( "0" == convert<string>( 0.0, cnv::charconv()(arg::precision = 0)).value());
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BOOST_TEST( "0.0" == convert<string>( 0.0, cnv::charconv()(arg::precision = 1)).value());
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BOOST_TEST("0.00" == convert<string>( 0.0, cnv::charconv()(arg::precision = 2)).value());
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BOOST_TEST( "1" == convert<string>(0.95, cnv::charconv()(arg::precision = 0)).value());
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BOOST_TEST( "0.9" == convert<string>(0.95, cnv::charconv()(arg::precision = 1)).value());
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BOOST_TEST("0.95" == convert<string>(0.95, cnv::charconv()(arg::precision = 2)).value());
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for (int k = 0; k < num_tries; ++k)
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compare(get_random());
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for (int k = 0; k < num_dbls; ++k)
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for (int precision = 0; precision < 3; ++precision)
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{
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compare(std::make_pair( dbls[k], precision));
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compare(std::make_pair(-dbls[k], precision));
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}
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printf("cnv::charconv::%s: finished.\n", __FUNCTION__);
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}
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static
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void
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test_user_string()
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{
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//[charconv_user_string
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boost::cnv::charconv cnv;
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BOOST_TEST( "12" == convert<my_string>(12, cnv).value());
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BOOST_TEST("0.95" == convert<my_string>(0.95, cnv(arg::precision = 2)).value());
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//]
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}
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static
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void
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test_user_type()
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{
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//[charconv_user_type
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boost::cnv::charconv cnv;
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change up_chg = change::up;
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change dn_chg = change::dn;
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BOOST_TEST(convert<std::string>(up_chg, cnv, "bad") == "up");
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BOOST_TEST(convert<std::string>(dn_chg, cnv, "bad") == "dn");
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BOOST_TEST(convert<std::string>( 12, cnv, "bad") == "12");
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BOOST_TEST(convert<change>("up", cnv, change::no) == change::up);
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BOOST_TEST(convert<change>("dn", cnv, change::no) == change::dn);
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BOOST_TEST(convert< int>("12", cnv, -1) == 12);
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//]
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}
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int
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main(int, char const* [])
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{
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dbl_to_str_example();
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test_str_to_int();
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test_str_to_uint();
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test_int_to_str();
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test_uint_to_str();
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test_base();
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test_skipws();
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test_notation();
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test_str_to_dbl();
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test_dbl_to_str();
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test_width();
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test_user_string();
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test_user_type();
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return boost::report_errors();
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}
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#endif
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