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Add operator<=>, array_thw_test.cpp

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Peter Dimov
2025-01-27 03:40:19 +02:00
parent 527ff0a80d
commit 9a4010b88b
3 changed files with 105 additions and 0 deletions
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17
include/boost/array.hpp
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@ -381,6 +381,23 @@ namespace boost {
x.swap(y);
}
#if defined(__cpp_impl_three_way_comparison) && __cpp_impl_three_way_comparison >= 201907L
template<class T, std::size_t N>
constexpr auto operator<=> (const array<T,N>& x, const array<T,N>& y)
-> decltype( x.elems[ 0 ] <=> y.elems[ 0 ] )
{
for( std::size_t i = 0; i < N; ++i )
{
auto r = x.elems[ i ] <=> y.elems[ i ];
if( r != 0 ) return r;
}
return 0 <=> 0; // std::strong_ordering::equal
}
#endif
// undocumented and obsolete
template <typename T, std::size_t N>
BOOST_DEPRECATED( "please use `elems` instead" )