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Beginnings of support for default_lens.

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The `default_lens` would be used for anything and everything.
And `tuplizeAggregate` can then be used to make a defaulted
`default_lens`.  This simplifies most lens oriented code, as
I move forward.
This commit is contained in:
ADAM David Alan Martin
2021-12-03 01:47:44 -05:00
parent 5f15b0ee38
commit 7de08953c8
3 changed files with 72 additions and 21 deletions
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27
Reflection/tuplizeAggregate.h
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@ -15,7 +15,30 @@ namespace Alepha::Hydrogen::Reflection
namespace detail::tuplize_aggregate
{
inline namespace exports
inline namespace exports {}
template< typename T, typename= void >
struct has_salient_members_constant : std::false_type {};
template< typename T >
struct has_salient_members_constant< T, std::void_t< decltype( T::salient_members ) > >
: std::true_type {};
template< typename T >
constexpr bool has_salient_members_constant_v= has_salient_members_constant< T >::value;
template< typename T >
constexpr std::size_t
compute_salient_members_count_impl()
{
if constexpr( has_salient_members_constant_v< T > ) return T::salient_members;
else return aggregate_member_count_v< std::decay_t< T > >;
}
template< typename T >
constexpr std::size_t compute_salient_members_count_v= compute_salient_members_count_impl< T >();
namespace exports
{
/*!
* Deconstruct an aggregate object into a tie-based tuple pointing at its members.
@ -170,7 +193,7 @@ namespace Alepha::Hydrogen::Reflection
constexpr decltype( auto )
tuplizeAggregate( Aggregate &&agg )
{
return tuplizeAggregate< aggregate_member_count_v< std::decay_t< Aggregate > > >( std::forward< Aggregate >( agg ) );
return tuplizeAggregate< compute_salient_members_count_v< std::decay_t< Aggregate > > >( std::forward< Aggregate >( agg ) );
}
}
}