45 lines
1.2 KiB
C++
45 lines
1.2 KiB
C++
template <typename T>
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using void_t = void;
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template <typename T, typename U>
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struct replace_first_arg;
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template <template <typename...> typename K, typename T, typename U>
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struct replace_first_arg<K<T>, U> {
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using type = K<U>;
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};
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template <typename A, typename T, typename = void>
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struct rebind : replace_first_arg<A, T> {};
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template <typename A, typename T>
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struct rebind<A, T, void_t<typename A::template rebind<T>::other>> {
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using type = typename A::template rebind<T>::other;
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};
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template <typename A>
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struct allocator_traits {
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using value_type = typename A::value_type;
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template <typename T>
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using rebind_alloc = typename rebind<A, T>::type;
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};
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template <typename A, typename = typename A::value_type>
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struct alloc_traits {
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using base = allocator_traits<A>;
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using value_type = typename base::value_type;
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using reference = value_type&;
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template <typename T>
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struct rebind {
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using other = typename base::template rebind_alloc<T>;
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};
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};
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template <typename T, typename A = std::allocator<T>>
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struct vector {
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using alloc_type = typename alloc_traits<A>::template rebind<T>::other;
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using reference = typename alloc_traits<alloc_type>::reference;
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};
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