mirror of
https://github.com/boostorg/core.git
synced 2025-11-28 13:29:19 +01:00
45bd9bf69b
This avoids the potential ambiguity between boost:: and std:: functions when the user calls data() or size() unqualified and both alternatives are found via ADL. Refs https://github.com/boostorg/core/issues/206.
60 lines
1.2 KiB
C++
60 lines
1.2 KiB
C++
/*
|
|
Copyright 2023 Glen Joseph Fernandes
|
|
(glenjofe@gmail.com)
|
|
|
|
Distributed under the Boost Software License, Version 1.0.
|
|
(http://www.boost.org/LICENSE_1_0.txt)
|
|
*/
|
|
#include <boost/config.hpp>
|
|
#if !defined(BOOST_NO_CXX11_CONSTEXPR) && !defined(BOOST_NO_CXX11_DECLTYPE)
|
|
#include <boost/core/size.hpp>
|
|
#include <boost/core/lightweight_test.hpp>
|
|
#include <iterator>
|
|
|
|
struct range {
|
|
std::size_t size() const {
|
|
return 4;
|
|
}
|
|
};
|
|
|
|
void test_range()
|
|
{
|
|
range c;
|
|
BOOST_TEST_EQ(boost::size(c), 4);
|
|
}
|
|
|
|
void test_array()
|
|
{
|
|
int a[4];
|
|
BOOST_TEST_EQ(boost::size(a), 4);
|
|
}
|
|
|
|
void test_ambiguity_with_std_size()
|
|
{
|
|
// Note: This preprocessor check should be equivalent to that in boost/core/size.hpp
|
|
#if (defined(__cpp_lib_nonmember_container_access) && (__cpp_lib_nonmember_container_access >= 201411l)) || \
|
|
(defined(_MSC_VER) && (_MSC_VER >= 1900))
|
|
|
|
// https://github.com/boostorg/core/issues/206
|
|
range c;
|
|
using std::size;
|
|
using boost::size;
|
|
BOOST_TEST_EQ(size(c), c.size());
|
|
|
|
#endif
|
|
}
|
|
|
|
int main()
|
|
{
|
|
test_range();
|
|
test_array();
|
|
test_ambiguity_with_std_size();
|
|
return boost::report_errors();
|
|
}
|
|
#else
|
|
int main()
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|