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38 lines
788 B
38 lines
788 B
#pragma once
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#include "core.h"
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namespace vlc
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{
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#ifndef VLC_HAS_STD_ALIGNED_UNION
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namespace detail
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{
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template<size_t...> struct Max;
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template<> struct Max<>
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{
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static constexpr size_t value = 0;
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};
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template<size_t val> struct Max<val>
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{
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static constexpr size_t value = val;
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};
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template<size_t A, size_t B, size_t... Rest> struct Max<A, B, Rest...> :
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public Max<A < B ? B : A, Rest...>
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{
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};
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}
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template<size_t minSize, typename... Types> struct aligned_union
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{
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static constexpr size_t len = detail::Max<minSize, sizeof(Types)...>::value;
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static constexpr size_t alignment = detail::Max<std::alignment_of<Types>::value...>::value;
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using type = typename std::aligned_storage<len, alignment>::type;
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};
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#else
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using std::aligned_union;
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#endif
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}
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