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Auto-generation of comparisons as a capability.

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This commit is contained in:
ADAM David Alan Martin
2023-10-22 05:15:43 -04:00
parent 08971abb06
commit 23c71c8d27
2 changed files with 38 additions and 2 deletions
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5
IOStreams/IStreamable.test/0.cc
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@ -7,16 +7,17 @@ static_assert( __cplusplus > 2020'00 );
#include <sstream>
#include <Alepha/auto_comparable.h>
namespace
{
template< typename= Alepha::Capabilities< Alepha::IOStreams::IStreamable > >
template< typename= Alepha::Capabilities< Alepha::auto_comparable, Alepha::IOStreams::IStreamable > >
struct Agg_core
{
int x;
int y;
int z;
friend bool operator == ( const Agg_core &lhs, const Agg_core &rhs )= default;
friend std::ostream &
operator << ( std::ostream &os, const Agg_core &agg )
{

35
auto_comparable.h Normal file
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@ -0,0 +1,35 @@
static_assert( __cplusplus > 2020'00 );
#pragma once
#include <Alepha/Alepha.h>
#include <Alepha/Capabilities.h>
#include <Alepha/comparisons.h>
#include <Alepha/Reflection/tuplizeAggregate.h>
namespace Alepha::Hydrogen ::detail:: auto_comparable_module
{
inline namespace exports
{
struct auto_comparable : comparable {};
}
template< typename T >
concept AutoComparableAggregate=
Capability< T, auto_comparable >
and
Aggregate< T >;
constexpr decltype( auto )
equality_lens( const AutoComparableAggregate auto &item ) noexcept
{
return detail::comparisons::magma_hook{ Reflection::tuplizeAggregate( item ) };
}
}
namespace Alepha::Hydrogen::inline exports::inline auto_comparable_module
{
using namespace detail::auto_comparable_module::exports;
}