From bd1de0bba4a5871cb988763b571731ebfde7ddb9 Mon Sep 17 00:00:00 2001 From: ADAM David Alan Martin Date: Thu, 28 Aug 2025 00:21:41 -0400 Subject: [PATCH] Conceptualize member spaceship lens. --- comparisons.h | 22 ++++++++-------------- 1 file changed, 8 insertions(+), 14 deletions(-) diff --git a/comparisons.h b/comparisons.h index 2ee7fea..3ad1bd5 100644 --- a/comparisons.h +++ b/comparisons.h @@ -34,23 +34,17 @@ namespace Alepha::Hydrogen // Spaceship lens support - template< typename T, typename= void > - struct has_spaceship_lens_member : std::false_type {}; - template< typename T > - struct has_spaceship_lens_member< T, std::void_t< decltype( std::declval< const T & >().spaceship_lens() ) > > : std::true_type {}; + concept MemberSpaceshipLensed= + LensComparable< T > + and + requires( const T &lhs, const T &rhs ) + { + { lhs.spaceship_lens() <=> rhs.spaceship_lens() } -> SameAs< std::strong_ordering >; + }; - template< typename T > - constexpr bool has_spaceship_lens_member_v= has_spaceship_lens_member< T >::value; - - template - < - LensComparable T, - typename= std::enable_if_t< has_spaceship_lens_member_v< T > >, - overload< __LINE__ > = nullptr - > constexpr decltype( auto ) - spaceship_lens( T &t ) + spaceship_lens( const MemberSpaceshipLensed auto &t ) { return t.spaceship_lens(); }