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Conceptualize member strict_weak_order_lens.

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ADAM David Alan Martin
2025-08-28 00:26:54 -04:00
parent 9987e962a3
commit 0ba1ea988a
1 changed files with 8 additions and 14 deletions
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22
comparisons.h
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@ -151,23 +151,17 @@ namespace Alepha::Hydrogen
// Strict weak order lens support
template< typename T, typename= void >
struct has_strict_weak_order_lens_member : std::false_type {};
template< typename T >
struct has_strict_weak_order_lens_member< T, std::void_t< decltype( std::declval< const T & >().strict_weak_order_lens() ) > > : std::true_type {};
concept MemberStrictWeakOrderLensed=
LensComparable< T >
and
requires( const T &val )
{
{ val.strict_weak_order_lens() } -> Concepts::LessThanComparable;
};
template< typename T >
constexpr bool has_strict_weak_order_lens_member_v= has_strict_weak_order_lens_member< T >::value;
template
<
LensComparable T,
typename= std::enable_if_t< has_strict_weak_order_lens_member_v< T > >,
overload< __LINE__ > = nullptr
>
constexpr decltype( auto )
strict_weak_order_lens( T &t )
strict_weak_order_lens( const MemberStrictWeakOrderLensed auto &t )
{
return t.strict_weak_order_lens();
}