fallbacks.cpp
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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 <functional>
namespace { namespace local
{
bool called_functor_int;
bool called_functor_double;
bool called_functor_foo;
bool called_function_int;
bool called_function_long;
}}
struct functor_int { int operator() () const { local:: called_functor_int = true; return INT_MAX; }};
struct functor_double { double operator() () const { local::called_functor_double = true; return INT_MAX; }};
struct functor_foo { int func (int) const { local:: called_functor_foo = true; return INT_MAX; }};
int function_int () { local:: called_function_int = true; return INT_MAX; }
long function_long () { local::called_function_long = true; return INT_MAX; }
int
main(int, char const* [])
{
auto cnv = boost::cnv::cstream();
auto foo = functor_foo();
int i01 = boost::convert<int>("uhm", cnv).value_or_eval(functor_int());
int i02 = boost::convert<int>("uhm", cnv).value_or_eval(functor_double());
int i03 = boost::convert<int>("uhm", cnv).value_or_eval(std::bind(&functor_foo::func, foo, 0));
int i04 = boost::convert<int>("uhm", cnv).value_or_eval(function_int);
int i05 = boost::convert<int>("uhm", cnv).value_or_eval(function_long);
BOOST_TEST(local:: called_functor_int && i01 == INT_MAX);
BOOST_TEST(local::called_functor_double && i02 == INT_MAX);
BOOST_TEST(local:: called_functor_foo && i03 == INT_MAX);
BOOST_TEST(local:: called_function_int && i04 == INT_MAX);
BOOST_TEST(local:: called_function_long && i05 == INT_MAX);
local:: called_functor_int = false;
local::called_functor_double = false;
local:: called_functor_foo = false;
local:: called_function_int = false;
local:: called_function_long = false;
boost::convert<int>("uhm", cnv, functor_int());
boost::convert<int>("uhm", cnv, functor_double());
boost::convert<int>("uhm", cnv, std::bind(&functor_foo::func, foo, 0));
boost::convert<int>("uhm", cnv, function_int);
boost::convert<int>("uhm", cnv, function_long);
BOOST_TEST(local:: called_functor_int && i01 == INT_MAX);
BOOST_TEST(local::called_functor_double && i02 == INT_MAX);
BOOST_TEST(local:: called_functor_foo && i03 == INT_MAX);
BOOST_TEST(local:: called_function_int && i04 == INT_MAX);
BOOST_TEST(local:: called_function_long && i05 == INT_MAX);
try
{
boost::convert<int>("uhm", cnv, boost::throw_on_failure);
BOOST_TEST(0);
}
catch (boost::bad_optional_access const&)
{
}
return boost::report_errors();
}
#endif