| //===----------------------------------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is dual licensed under the MIT and the University of Illinois Open |
| // Source Licenses. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: c++98, c++03, c++11, c++14 |
| |
| // <any> |
| |
| // Check that the size and alignment of any are what we expect. |
| |
| #include <any> |
| #include "any_helpers.h" |
| |
| constexpr std::size_t BufferSize = (sizeof(void*) * 3); |
| constexpr std::size_t BufferAlignment = alignof(void*); |
| // Clang doesn't like "alignof(BufferAlignment * 2)" due to PR13986. |
| // So we create "DoubleBufferAlignment" instead. |
| constexpr std::size_t DoubleBufferAlignment = BufferAlignment * 2; |
| |
| class SmallThrowsDtor |
| { |
| public: |
| SmallThrowsDtor() {} |
| SmallThrowsDtor(SmallThrowsDtor const &) noexcept {} |
| SmallThrowsDtor(SmallThrowsDtor &&) noexcept {} |
| ~SmallThrowsDtor() noexcept(false) {} |
| }; |
| |
| |
| struct alignas(1) MaxSizeType { |
| char buff[BufferSize]; |
| }; |
| |
| struct alignas(BufferAlignment) MaxAlignType { |
| }; |
| |
| struct alignas(BufferAlignment) MaxSizeAndAlignType { |
| char buff[BufferSize]; |
| }; |
| |
| |
| struct alignas(1) OverSizeType { |
| char buff[BufferSize + 1]; |
| }; |
| |
| struct alignas(DoubleBufferAlignment) OverAlignedType { |
| }; |
| |
| struct alignas(DoubleBufferAlignment) OverSizeAndAlignedType { |
| char buff[BufferSize + 1]; |
| }; |
| |
| int main() |
| { |
| using std::any; |
| using std::__any_imp::_IsSmallObject; |
| static_assert(_IsSmallObject<small>::value, ""); |
| static_assert(_IsSmallObject<void*>::value, ""); |
| static_assert(!_IsSmallObject<SmallThrowsDtor>::value, ""); |
| static_assert(!_IsSmallObject<large>::value, ""); |
| { |
| // Check a type that meets the size requirement *exactly* and has |
| // a lesser alignment requirement is considered small. |
| typedef MaxSizeType T; |
| static_assert(sizeof(T) == BufferSize, ""); |
| static_assert(alignof(T) < BufferAlignment, ""); |
| static_assert(_IsSmallObject<T>::value, ""); |
| } |
| { |
| // Check a type that meets the alignment requirement *exactly* and has |
| // a lesser size is considered small. |
| typedef MaxAlignType T; |
| static_assert(sizeof(T) < BufferSize, ""); |
| static_assert(alignof(T) == BufferAlignment, ""); |
| static_assert(_IsSmallObject<T>::value, ""); |
| } |
| { |
| // Check a type that meets the size and alignment requirements *exactly* |
| // is considered small. |
| typedef MaxSizeAndAlignType T; |
| static_assert(sizeof(T) == BufferSize, ""); |
| static_assert(alignof(T) == BufferAlignment, ""); |
| static_assert(_IsSmallObject<T>::value, ""); |
| } |
| { |
| // Check a type that meets the alignment requirements but is over-sized |
| // is not considered small. |
| typedef OverSizeType T; |
| static_assert(sizeof(T) > BufferSize, ""); |
| static_assert(alignof(T) < BufferAlignment, ""); |
| static_assert(!_IsSmallObject<T>::value, ""); |
| } |
| { |
| // Check a type that meets the size requirements but is over-aligned |
| // is not considered small. |
| typedef OverAlignedType T; |
| static_assert(sizeof(T) < BufferSize, ""); |
| static_assert(alignof(T) > BufferAlignment, ""); |
| static_assert(!_IsSmallObject<T>::value, ""); |
| } |
| { |
| // Check a type that exceeds both the size an alignment requirements |
| // is not considered small. |
| typedef OverSizeAndAlignedType T; |
| static_assert(sizeof(T) > BufferSize, ""); |
| static_assert(alignof(T) > BufferAlignment, ""); |
| static_assert(!_IsSmallObject<T>::value, ""); |
| } |
| } |