Ambigous overloaded operator==(std::string, char*)

[sgn]

Not sure if I should this issue should be reported here or reported to the other upstream, but this short example is failed to be compiled:

#include <string>
#include <boost/filesystem.hpp>

using namespace boost::filesystem;

bool f(char *arg) {
	return std::string("a-str") == arg;
}

GNU's g++ reports:

test.cpp: In function 'bool f(char*)':
test.cpp:7:40: warning: ISO C++ says that these are ambiguous, even though the worst conversion for the first is better than the worst conversion for the second:
7 | return std::string("a-str") == arg;
| ^~~
In file included from /usr/include/c++/12.2/string:53,
from test.cpp:1:
/usr/include/c++/12.2/bits/basic_string.h:3599:5: note: candidate 1: 'bool std::operator==(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const _CharT*) [with _CharT = char; _Traits = char_traits; _Alloc = allocator]'
3599 | operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
| ^~~~~~~~
In file included from /usr/include/boost/filesystem.hpp:16,
from test.cpp:2:
/usr/include/boost/filesystem/path.hpp:1294:9: note: candidate 2: 'typename boost::enable_if_c<boost::filesystem::detail::path_traits::is_convertible_to_path_source<typename boost::remove_cv::type>::value, bool>::type boost::filesystem::operator==(const path&, const Source&) [with Source = char*; typename boost::enable_if_c<detail::path_traits::is_convertible_to_path_source<typename boost::remove_cv::type>::value, bool>::type = bool; typename boost::remove_cv::type = char*]'
1294 | >::type operator==(path const& lhs, Source const& rhs)
| ^~~~~~~~

clang++ reports:

test.cpp:7:30: error: use of overloaded operator '==' is ambiguous (with operand types 'std::string' (aka 'basic_string') and 'char *')
return std::string("a-str") == arg;
~~~~~~~~~~~~~~~~~~~~ ^ ~~~
/usr/bin/../lib64/gcc/x86_64-linux-gnu/12.2/../../../../include/c++/12.2/bits/basic_string.h:3599:5: note: candidate function [with _CharT = char, _Traits = std::char_traits, _Alloc = std::allocator]
operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
^
/usr/include/boost/filesystem/path.hpp:1294:9: note: candidate function [with Source = char *]

::type operator==(path const& lhs, Source const& rhs)
^
/usr/include/boost/filesystem/path.hpp:1303:9: note: candidate function [with Source = std::basic_string]
::type operator==(Source const& lhs, path const& rhs)
^
1 error generated.

[Lastique]

I think this should work if you remove using namespace boost::filesystem;.