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// Boost.Convert test and usage example
// Copyright (c) 2009-2020 Vladimir Batov.
// Use, modification and distribution are subject to the Boost Software License,
// Version 1.0. See http://www.boost.org/LICENSE_1_0.txt.
#include "./test.hpp"
#if !defined(BOOST_CONVERT_CXX14)
int main(int, char const* []) { return 0; }
#else
#include <boost/convert.hpp>
#include <boost/convert/stream.hpp>
#include <boost/convert/printf.hpp>
#include <boost/convert/strtol.hpp>
#include <boost/convert/lexical_cast.hpp>
#include <boost/convert/spirit.hpp>
using std::string;
template<typename Converter>
void
int_to_str(Converter const& cnv)
{
string const not_int_str = "not an int";
string const std_str = "-11";
char const* const c_str = "-12";
char const array_str[] = "-15";
////////////////////////////////////////////////////////////////////////////
// Testing int-to-string conversion with various string
// containers as the fallback values.
////////////////////////////////////////////////////////////////////////////
string s01 = boost::convert<string>(-1, cnv).value_or(std_str);
string s02 = boost::convert<string>(-2, cnv).value_or(c_str);
string s05 = boost::convert<string>(-5, cnv).value_or(array_str);
boost::optional<string> rs01 = boost::convert<string>(-1, cnv);
boost::optional<string> rs02 = boost::convert<string>(-2, cnv);
boost::optional<string> rs05 = boost::convert<string>(-5, cnv);
BOOST_TEST(s01 == "-1"); BOOST_TEST(rs01 && rs01.value() == "-1");
BOOST_TEST(s02 == "-2"); BOOST_TEST(rs02 && rs02.value() == "-2");
BOOST_TEST(s05 == "-5"); BOOST_TEST(rs05 && rs05.value() == "-5");
string s11 = boost::convert<string>(-1, cnv).value();
boost::optional< string> rs11 = boost::convert<string>(-1, cnv);
BOOST_TEST( s11 == "-1");
BOOST_TEST(rs11 && rs11.value() == "-1");
}
template<typename Converter>
void
str_to_int(Converter const& cnv)
{
string const not_int_str = "not an int";
string const std_str = "-11";
char const* const c_str = "-123";
char const array_str[] = "3456";
////////////////////////////////////////////////////////////////////////////
// Testing various kinds of string containers.
// Testing implicit conversion directly to TypeOut (int).
// Testing with the fallback value value provided.
// On failure returns the provided fallback value and DOES NOT THROW.
////////////////////////////////////////////////////////////////////////////
int const a00 = boost::convert<int>(not_int_str, cnv).value_or(-1);
int const a01 = boost::convert<int>(std_str, cnv).value_or(-1);
int const a02 = boost::convert<int>(c_str, cnv).value_or(-1);
int const a05 = boost::convert<int>(array_str, cnv).value_or(-1);
BOOST_TEST(a00 == -1); // Failed conversion
BOOST_TEST(a01 == -11);
BOOST_TEST(a02 == -123);
BOOST_TEST(a05 == 3456);
////////////////////////////////////////////////////////////////////////////
// Testing "optional"
////////////////////////////////////////////////////////////////////////////
boost::optional<int> const r00 = boost::convert<int>(not_int_str, cnv);
boost::optional<int> const r01 = boost::convert<int>(std_str, cnv);
boost::optional<int> const r02 = boost::convert<int>(c_str, cnv);
boost::optional<int> const r05 = boost::convert<int>(array_str, cnv);
BOOST_TEST(!r00); // Failed conversion
BOOST_TEST( r01 && r01.value() == -11);
BOOST_TEST( r02 && r02.value() == -123);
BOOST_TEST( r05 && r05.value() == 3456);
////////////////////////////////////////////////////////////////////////////
// Testing value() on invalid result.
////////////////////////////////////////////////////////////////////////////
try
{
boost::convert<int>(not_int_str, cnv).value();
BOOST_TEST(!"failed to throw");
}
catch (std::exception&)
{
// Expected behavior: received 'boost::convert failed' exception. All well.
}
////////////////////////////////////////////////////////////////////////////
// Testing value() on valid result.
////////////////////////////////////////////////////////////////////////////
int a21 = boost::convert<int>(std_str, cnv).value();
int a22 = boost::convert<int>(c_str, cnv).value();
int a25 = boost::convert<int>(array_str, cnv).value();
BOOST_TEST(a21 == -11);
BOOST_TEST(a22 == -123);
BOOST_TEST(a25 == 3456);
////////////////////////////////////////////////////////////////////////////
// Testing empty string.
////////////////////////////////////////////////////////////////////////////
int a31 = boost::convert<int>(std::string(), cnv).value_or(-1);
int a32 = boost::convert<int>(std::string(""), cnv).value_or(-1);
int a33 = boost::convert<int>("", cnv).value_or(-1);
BOOST_ASSERT(a31 == -1);
BOOST_ASSERT(a32 == -1);
BOOST_ASSERT(a33 == -1);
}
int
main(int, char const* [])
{
auto lxcast_cnv = boost::cnv::lexical_cast();
auto stream_cnv = boost::cnv::cstream();
auto strtol_cnv = boost::cnv::strtol();
auto printf_cnv = boost::cnv::printf();
auto spirit_cnv = boost::cnv::spirit();
str_to_int(lxcast_cnv);
str_to_int(stream_cnv);
str_to_int(strtol_cnv);
str_to_int(printf_cnv);
str_to_int(spirit_cnv);
int_to_str(lxcast_cnv);
int_to_str(stream_cnv);
int_to_str(strtol_cnv);
int_to_str(printf_cnv);
int_to_str(spirit_cnv);
return boost::report_errors();
}
#endif
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