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// ==========================================================================
// Type Traits for smart pointers
// Supporting is_unique_ptr< T >, is_shared_ptr< T >, is_smart_ptr< T >, is_ptr< T >
// Usage is like std::is_pointer< T >.
// Soft version type traits additionally evalute a derived class from a pointer as true.
// Just write "soft" after a type_trait to detect inheritance too.
// ==========================================================================
#ifndef _smart_pointer_type_trait
#define _smart_pointer_type_trait
#include <memory>
namespace woon2
{
namespace detail
{
// for removing const, volatile, reference.
// via this, type traits have no dependency on qualifiers.
template < typename T >
using remove_cvr_t = std::remove_cv_t< std::remove_reference_t< T > >;
}
// =======================================================================================
// shared_ptr type trait
// =======================================================================================
namespace detail
{
template < typename T >
struct is_shared_ptr_impl : std::false_type {};
template < typename T >
struct is_shared_ptr_impl< std::shared_ptr< T > > : std::true_type {};
template < typename T >
std::true_type is_shared_ptr_soft_impl( const std::shared_ptr< T >* );
std::false_type is_shared_ptr_soft_impl( ... );
}
template < typename T >
using is_shared_ptr = detail::is_shared_ptr_impl< detail::remove_cvr_t< T > >;
template < typename T >
constexpr bool is_shared_ptr_v = is_shared_ptr< T >::value;
template < typename T >
using is_shared_ptr_soft = decltype( detail::is_shared_ptr_soft_impl( std::declval< detail::remove_cvr_t< T >* >() ) );
template < typename T >
constexpr bool is_shared_ptr_soft_v = is_shared_ptr_soft< T >::value;
// shared_ptr type trait end =============================================================
// =======================================================================================
// unique_ptr type trait
// =======================================================================================
namespace detail
{
template < typename T >
struct is_unique_ptr_impl : std::false_type {};
template < typename T, typename Dx >
struct is_unique_ptr_impl< std::unique_ptr< T, Dx > > : std::true_type {};
template < typename T, typename Dx >
std::true_type is_unique_ptr_soft_impl( std::unique_ptr< T, Dx >* );
std::false_type is_unique_ptr_soft_impl( ... );
}
template < typename T >
using is_unique_ptr = detail::is_unique_ptr_impl< detail::remove_cvr_t< T > >;
template < typename T >
constexpr bool is_unique_ptr_v = is_unique_ptr< T >::value;
template < typename T >
using is_unique_ptr_soft = decltype( detail::is_unique_ptr_soft_impl( std::declval< detail::remove_cvr_t< T >* >() ) );
template < typename T >
constexpr bool is_unique_ptr_soft_v = is_unique_ptr_soft< T >::value;
// unique_ptr type trait end =============================================================
// =======================================================================================
// united type trait ( smart pointers )
// =======================================================================================
template < typename T >
using is_smart_ptr = std::conditional_t<
is_shared_ptr_v< T >,
std::true_type,
std::conditional_t<
is_unique_ptr_v< T >,
std::true_type,
std::false_type
>
>;
template < typename T >
constexpr bool is_smart_ptr_v = is_smart_ptr< T >::value;
namespace detail
{
template < typename T, typename Dx >
std::true_type is_smart_ptr_soft_impl( std::unique_ptr< T, Dx >* );
template < typename T >
std::true_type is_smart_ptr_soft_impl( std::shared_ptr< T >* );
std::false_type is_smart_ptr_soft_impl( ... );
}
template < typename T >
using is_smart_ptr_soft = decltype( detail::is_smart_ptr_soft_impl( std::declval< detail::remove_cvr_t< T >* >() ) );
template < typename T >
constexpr bool is_smart_ptr_soft_v = is_smart_ptr_soft< T >::value;
// united type trait ( smart pointers ) end ==============================================
// =======================================================================================
// united type trait ( all pointable classes )
// =======================================================================================
namespace detail
{
template < typename T, typename _ = void >
struct is_pointable_impl : std::false_type {};
template < typename T >
struct is_pointable_impl< T* > : std::true_type {};
template < typename ... Ts >
struct is_pointable_helper {};
template < typename T >
struct is_pointable_impl< T,
std::conditional_t<
false,
is_pointable_helper<
decltype( std::declval< T >().operator->() ),
decltype( std::declval< T >().operator*() )
>,
void
>
> : std::true_type {};
}
template < typename T >
using is_pointable = detail::is_pointable_impl< detail::remove_cvr_t< T > >;
template < typename T >
constexpr bool is_pointable_v = is_pointable< T >::value;
// united type trait ( all pointable classes ) end =======================================
// method trait ( trace if a pointer class has a specified method. ) =====================
namespace detail
{
// has_reset detail ==================================================================
template < typename T, typename _ = void >
struct has_reset_impl : std::false_type {};
template < typename ... Ts >
struct has_reset_helper {};
template < typename T >
struct has_reset_impl< T, std::conditional_t<
false,
has_reset_helper<
decltype( std::declval< T >().reset() )
>,
void
>
> : std::true_type {};
// has_reset detail end ==============================================================
// has_release detail ================================================================
template < typename T, typename _ = void >
struct has_release_impl : std::false_type {};
template < typename ... Ts >
struct has_release_helper {};
template < typename T >
struct has_release_impl< T, std::conditional_t<
false,
has_release_helper<
decltype( std::declval< T >().release() )
>,
void
>
> : std::true_type {};
// has_release detail end ============================================================
// has_get_deleter detail ============================================================
template < typename T, typename _ = void >
struct has_get_deleter_impl : std::false_type {};
template < typename ... Ts >
struct has_get_deleter_helper {};
template < typename T >
struct has_get_deleter_impl< T, std::conditional_t<
false,
has_get_deleter_helper<
decltype( std::declval< T >().get_deleter() ),
decltype( std::declval< T >().get_deleter() )
>,
void
>
> : std::true_type {};
// has_get_deleter detail end=========================================================
// has_swap detail ===================================================================
template < typename T, typename _ = void >
struct has_swap_impl : std::false_type {};
template < typename ... Ts >
struct has_swap_helper {};
template < typename T >
struct has_swap_impl< T, std::conditional_t<
false,
has_swap_helper<
decltype( std::declval< T >().swap( std::declval< std::add_lvalue_reference_t< T > >() ) )
>,
void
>
> : std::true_type {};
// has_swap detail end ===============================================================
} // detail
template < typename T >
using has_reset = detail::has_reset_impl< detail::remove_cvr_t< T > >;
template < typename T >
constexpr bool has_reset_v = has_reset< T >::value;
template < typename T >
using has_release = detail::has_release_impl< detail::remove_cvr_t< T > >;
template < typename T >
constexpr bool has_release_v = has_release< T >::value;
template < typename T >
using has_get_deleter = detail::has_get_deleter_impl< detail::remove_cvr_t< T > >;
template < typename T >
constexpr bool has_get_deleter_v = has_get_deleter< T >::value;
template < typename T >
using has_swap = detail::has_swap_impl< detail::remove_cvr_t< T > >;
template < typename T >
constexpr bool has_swap_v = has_swap< T >::value;
// method trait end ======================================================================
// =======================================================================================
// Additional pointer type trait
// You can add your own pointer class's type trait.
// This is the template for that.
// Can be detected by is_pointable< T >
// =======================================================================================
// just for sample, it will be better for you to make your pointer class be in another header file.
template < typename T >
struct your_pointer {};
// /sample
// just alter all "your_pointer"s to your pointer class's name.
namespace detail
{
template < typename T >
struct is_your_pointer_impl : std::false_type {};
template < typename T >
struct is_your_pointer_impl< your_pointer< T > > : std::true_type {};
template < typename T >
std::true_type is_your_pointer_soft_impl( your_pointer< T >* );
std::false_type is_your_pointer_soft_impl( ... );
}
template < typename T >
using is_your_pointer = detail::is_your_pointer_impl< detail::remove_cvr_t< T > >;
template < typename T >
constexpr bool is_your_pointer_v = is_your_pointer< T >::value;
template < typename T >
using is_your_pointer_soft = decltype( detail::is_your_pointer_soft_impl( std::declval< detail::remove_cvr_t< T >* >() ) );
template < typename T >
constexpr bool is_your_pointer_soft_v = is_your_pointer_soft< T >::value;
// additional pointer type trait end =============================================================
}
#endif // _smart_pointer_type_trait