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Check for the existence of <compare>, include it, use it; 0 <=> 0 doesn't work without it anyway.

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Peter Dimov
2025-01-29 04:03:41 +02:00
parent 37a4833e26
commit 84d0f84c9b
1 changed files with 11 additions and 3 deletions
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14
include/boost/array.hpp
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@ -51,6 +51,12 @@
#include <utility>
#include <cstddef>
#if defined(__cpp_impl_three_way_comparison) && __cpp_impl_three_way_comparison >= 201907L
# if __has_include(<compare>)
# include <compare>
# endif
#endif
namespace boost {
template<class T, std::size_t N>
@ -383,6 +389,7 @@ namespace boost {
}
#if defined(__cpp_impl_three_way_comparison) && __cpp_impl_three_way_comparison >= 201907L
# if __has_include(<compare>)
template<class T, std::size_t N>
constexpr auto operator<=> (const array<T,N>& x, const array<T,N>& y)
@ -394,16 +401,17 @@ namespace boost {
if( r != 0 ) return r;
}
return 0 <=> 0; // std::strong_ordering::equal
return std::strong_ordering::equal;
}
template<class T>
constexpr auto operator<=> (const array<T,0>& /*x*/, const array<T,0>& /*y*/)
-> decltype( 0 <=> 0 )
-> std::strong_ordering
{
return 0 <=> 0; // std::strong_ordering::equal
return std::strong_ordering::equal;
}
# endif
#endif
// undocumented and obsolete