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Vulkan-Hpp/snippets/StructureChain.hpp

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template <typename X, typename Y>
struct StructExtends
{
enum
{
value = false
};
};
template <typename Type, class...>
struct IsPartOfStructureChain
{
static const bool valid = false;
};
template <typename Type, typename Head, typename... Tail>
struct IsPartOfStructureChain<Type, Head, Tail...>
{
static const bool valid = std::is_same<Type, Head>::value || IsPartOfStructureChain<Type, Tail...>::valid;
};
template <size_t Index, typename T, typename... ChainElements>
struct StructureChainContains
{
static const bool value = std::is_same<T, typename std::tuple_element<Index, std::tuple<ChainElements...>>::type>::value ||
StructureChainContains<Index - 1, T, ChainElements...>::value;
};
template <typename T, typename... ChainElements>
struct StructureChainContains<0, T, ChainElements...>
{
static const bool value = std::is_same<T, typename std::tuple_element<0, std::tuple<ChainElements...>>::type>::value;
};
template <size_t Index, typename... ChainElements>
struct StructureChainValidation
{
using TestType = typename std::tuple_element<Index, std::tuple<ChainElements...>>::type;
static const bool valid = StructExtends<TestType, typename std::tuple_element<0, std::tuple<ChainElements...>>::type>::value &&
( TestType::allowDuplicate || !StructureChainContains<Index - 1, TestType, ChainElements...>::value ) &&
StructureChainValidation<Index - 1, ChainElements...>::valid;
};
template <typename... ChainElements>
struct StructureChainValidation<0, ChainElements...>
{
static const bool valid = true;
};
template <typename... ChainElements>
class StructureChain : public std::tuple<ChainElements...>
{
// Note: StructureChain has no move constructor or move assignment operator, as it is not supposed to contain movable containers.
// In order to get a copy-operation on a move-operations, those functions are neither deleted nor defaulted.
public:
StructureChain() VULKAN_HPP_NOEXCEPT
{
static_assert( StructureChainValidation<sizeof...( ChainElements ) - 1, ChainElements...>::valid, "The structure chain is not valid!" );
link<sizeof...( ChainElements ) - 1>();
}
StructureChain( StructureChain const & rhs ) VULKAN_HPP_NOEXCEPT : std::tuple<ChainElements...>( rhs )
{
static_assert( StructureChainValidation<sizeof...( ChainElements ) - 1, ChainElements...>::valid, "The structure chain is not valid!" );
link( &std::get<0>( *this ),
&std::get<0>( rhs ),
reinterpret_cast<VkBaseOutStructure *>( &std::get<0>( *this ) ),
reinterpret_cast<VkBaseInStructure const *>( &std::get<0>( rhs ) ) );
}
StructureChain( ChainElements const &... elems ) VULKAN_HPP_NOEXCEPT : std::tuple<ChainElements...>( elems... )
{
static_assert( StructureChainValidation<sizeof...( ChainElements ) - 1, ChainElements...>::valid, "The structure chain is not valid!" );
link<sizeof...( ChainElements ) - 1>();
}
StructureChain & operator=( StructureChain const & rhs ) VULKAN_HPP_NOEXCEPT
{
std::tuple<ChainElements...>::operator=( rhs );
link( &std::get<0>( *this ),
&std::get<0>( rhs ),
reinterpret_cast<VkBaseOutStructure *>( &std::get<0>( *this ) ),
reinterpret_cast<VkBaseInStructure const *>( &std::get<0>( rhs ) ) );
return *this;
}
template <typename T = typename std::tuple_element<0, std::tuple<ChainElements...>>::type, size_t Which = 0>
T & get() VULKAN_HPP_NOEXCEPT
{
return std::get<ChainElementIndex<0, T, Which, void, ChainElements...>::value>( static_cast<std::tuple<ChainElements...> &>( *this ) );
}
template <typename T = typename std::tuple_element<0, std::tuple<ChainElements...>>::type, size_t Which = 0>
T const & get() const VULKAN_HPP_NOEXCEPT
{
return std::get<ChainElementIndex<0, T, Which, void, ChainElements...>::value>( static_cast<std::tuple<ChainElements...> const &>( *this ) );
}
template <typename T0, typename T1, typename... Ts>
std::tuple<T0 &, T1 &, Ts &...> get() VULKAN_HPP_NOEXCEPT
{
return std::tie( get<T0>(), get<T1>(), get<Ts>()... );
}
template <typename T0, typename T1, typename... Ts>
std::tuple<T0 const &, T1 const &, Ts const &...> get() const VULKAN_HPP_NOEXCEPT
{
return std::tie( get<T0>(), get<T1>(), get<Ts>()... );
}
// assign a complete structure to the StructureChain without modifying the chaining
template <typename T = typename std::tuple_element<0, std::tuple<ChainElements...>>::type, size_t Which = 0>
StructureChain & assign( const T & rhs ) VULKAN_HPP_NOEXCEPT
{
T & lhs = get<T, Which>();
auto pNext = lhs.pNext;
lhs = rhs;
lhs.pNext = pNext;
return *this;
}
template <typename ClassType, size_t Which = 0>
typename std::enable_if<std::is_same<ClassType, typename std::tuple_element<0, std::tuple<ChainElements...>>::type>::value && ( Which == 0 ), bool>::type
isLinked() const VULKAN_HPP_NOEXCEPT
{
return true;
}
template <typename ClassType, size_t Which = 0>
typename std::enable_if<!std::is_same<ClassType, typename std::tuple_element<0, std::tuple<ChainElements...>>::type>::value || ( Which != 0 ), bool>::type
isLinked() const VULKAN_HPP_NOEXCEPT
{
static_assert( IsPartOfStructureChain<ClassType, ChainElements...>::valid, "Can't unlink Structure that's not part of this StructureChain!" );
return isLinked( reinterpret_cast<VkBaseInStructure const *>( &get<ClassType, Which>() ) );
}
template <typename ClassType, size_t Which = 0>
typename std::enable_if<!std::is_same<ClassType, typename std::tuple_element<0, std::tuple<ChainElements...>>::type>::value || ( Which != 0 ), void>::type
relink() VULKAN_HPP_NOEXCEPT
{
static_assert( IsPartOfStructureChain<ClassType, ChainElements...>::valid, "Can't relink Structure that's not part of this StructureChain!" );
auto pNext = reinterpret_cast<VkBaseInStructure *>( &get<ClassType, Which>() );
VULKAN_HPP_ASSERT( !isLinked( pNext ) );
auto & headElement = std::get<0>( static_cast<std::tuple<ChainElements...> &>( *this ) );
pNext->pNext = reinterpret_cast<VkBaseInStructure const *>( headElement.pNext );
headElement.pNext = pNext;
}
template <typename ClassType, size_t Which = 0>
typename std::enable_if<!std::is_same<ClassType, typename std::tuple_element<0, std::tuple<ChainElements...>>::type>::value || ( Which != 0 ), void>::type
unlink() VULKAN_HPP_NOEXCEPT
{
static_assert( IsPartOfStructureChain<ClassType, ChainElements...>::valid, "Can't unlink Structure that's not part of this StructureChain!" );
unlink( reinterpret_cast<VkBaseOutStructure const *>( &get<ClassType, Which>() ) );
}
private:
template <int Index, typename T, int Which, typename, class First, class... Types>
struct ChainElementIndex : ChainElementIndex<Index + 1, T, Which, void, Types...>
{
};
template <int Index, typename T, int Which, class First, class... Types>
struct ChainElementIndex<Index, T, Which, typename std::enable_if<!std::is_same<T, First>::value, void>::type, First, Types...>
: ChainElementIndex<Index + 1, T, Which, void, Types...>
{
};
template <int Index, typename T, int Which, class First, class... Types>
struct ChainElementIndex<Index, T, Which, typename std::enable_if<std::is_same<T, First>::value, void>::type, First, Types...>
: ChainElementIndex<Index + 1, T, Which - 1, void, Types...>
{
};
template <int Index, typename T, class First, class... Types>
struct ChainElementIndex<Index, T, 0, typename std::enable_if<std::is_same<T, First>::value, void>::type, First, Types...>
: std::integral_constant<int, Index>
{
};
bool isLinked( VkBaseInStructure const * pNext ) const VULKAN_HPP_NOEXCEPT
{
VkBaseInStructure const * elementPtr =
reinterpret_cast<VkBaseInStructure const *>( &std::get<0>( static_cast<std::tuple<ChainElements...> const &>( *this ) ) );
while ( elementPtr )
{
if ( elementPtr->pNext == pNext )
{
return true;
}
elementPtr = elementPtr->pNext;
}
return false;
}
template <size_t Index>
typename std::enable_if<Index != 0, void>::type link() VULKAN_HPP_NOEXCEPT
{
auto & x = std::get<Index - 1>( static_cast<std::tuple<ChainElements...> &>( *this ) );
x.pNext = &std::get<Index>( static_cast<std::tuple<ChainElements...> &>( *this ) );
link<Index - 1>();
}
template <size_t Index>
typename std::enable_if<Index == 0, void>::type link() VULKAN_HPP_NOEXCEPT
{
}
void link( void * dstBase, void const * srcBase, VkBaseOutStructure * dst, VkBaseInStructure const * src )
{
while ( src->pNext )
{
std::ptrdiff_t offset = reinterpret_cast<char const *>( src->pNext ) - reinterpret_cast<char const *>( srcBase );
dst->pNext = reinterpret_cast<VkBaseOutStructure *>( reinterpret_cast<char *>( dstBase ) + offset );
dst = dst->pNext;
src = src->pNext;
}
dst->pNext = nullptr;
}
void unlink( VkBaseOutStructure const * pNext ) VULKAN_HPP_NOEXCEPT
{
VkBaseOutStructure * elementPtr = reinterpret_cast<VkBaseOutStructure *>( &std::get<0>( static_cast<std::tuple<ChainElements...> &>( *this ) ) );
while ( elementPtr && ( elementPtr->pNext != pNext ) )
{
elementPtr = elementPtr->pNext;
}
if ( elementPtr )
{
elementPtr->pNext = pNext->pNext;
}
else
{
VULKAN_HPP_ASSERT( false ); // fires, if the ClassType member has already been unlinked !
}
}
};
// interupt the VULKAN_HPP_NAMESPACE for a moment to add specializations of std::tuple_size and std::tuple_element for the StructureChain!
}
namespace std
{
template <typename... Elements>
struct tuple_size<VULKAN_HPP_NAMESPACE::StructureChain<Elements...>>
{
static constexpr size_t value = std::tuple_size<std::tuple<Elements...>>::value;
};
template <std::size_t Index, typename... Elements>
struct tuple_element<Index, VULKAN_HPP_NAMESPACE::StructureChain<Elements...>>
{
using type = typename std::tuple_element<Index, std::tuple<Elements...>>::type;
};
} // namespace std
namespace VULKAN_HPP_NAMESPACE
{
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