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// { dg-options "-std=gnu++23" }
// { dg-do compile { target c++23 } }
// { dg-require-effective-target stacktrace }
#include <stacktrace>
#ifndef __cpp_lib_stacktrace
# error "Feature-test macro for stacktrace missing in <stacktrace>"
#elif __cpp_lib_stacktrace < 202011L
# error "Feature-test macro for stacktrace has wrong value in <stacktrace>"
#endif
namespace std
{
class stacktrace_entry;
template<class Allocator>
class basic_stacktrace;
using stacktrace = basic_stacktrace<allocator<stacktrace_entry>>;
template<class Allocator>
void swap(basic_stacktrace<Allocator>& a, basic_stacktrace<Allocator>& b)
noexcept(noexcept(a.swap(b)));
string to_string(const stacktrace_entry& f);
template<class Allocator>
string to_string(const basic_stacktrace<Allocator>& st);
template<class charT, class traits>
basic_ostream<charT, traits>&
operator<<(basic_ostream<charT, traits>& os, const stacktrace_entry& f);
template<class charT, class traits, class Allocator>
basic_ostream<charT, traits>&
operator<<(basic_ostream<charT, traits>& os, const basic_stacktrace<Allocator>& st);
namespace pmr {
using stacktrace = basic_stacktrace<polymorphic_allocator<stacktrace_entry>>;
}
template<class T> struct hash;
template<> struct hash<stacktrace_entry>;
template<class Allocator> struct hash<basic_stacktrace<Allocator>>;
}
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