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63 lines
1.7 KiB
C++
63 lines
1.7 KiB
C++
/**
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* @file libpmr/allocator.h
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* @author mutouyun (orz@orzz.org)
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* @brief A generic polymorphic memory allocator.
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* @date 2022-11-13
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*/
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#pragma once
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#include <type_traits>
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#include "libimp/export.h"
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#include "libpmr/def.h"
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#include "libpmr/memory_resource.h"
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LIBPMR_NAMESPACE_BEG_
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namespace detail {
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/// @brief Helper trait for allocator.
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template <typename T, typename = void>
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struct has_allocate : std::false_type {};
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template <typename T>
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struct has_allocate<T,
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typename std::enable_if<std::is_convertible<
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decltype(std::declval<T &>().allocate(std::declval<std::size_t>())), void *
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>::value>::type> : std::true_type {};
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template <typename T, typename = void>
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struct has_deallocate : std::false_type {};
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template <typename T>
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struct has_deallocate<T,
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decltype(std::declval<T &>().deallocate(std::declval<void *>(),
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std::declval<std::size_t>()))
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> : std::true_type {};
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template <typename T>
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using is_memory_resource =
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typename std::enable_if<has_allocate <T>::value &&
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has_deallocate<T>::value>::type;
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} // namespace detail
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/**
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* @brief An allocator which exhibits different allocation behavior
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* depending upon the memory resource from which it is constructed.
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*
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* @remarks Unlike std::pmr::polymorphic_allocator, it does not
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* rely on a specific inheritance relationship and only restricts
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* the interface behavior of the incoming memory resource object to
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* conform to std::pmr::memory_resource.
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*
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* @see https://en.cppreference.com/w/cpp/memory/memory_resource
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* https://en.cppreference.com/w/cpp/memory/polymorphic_allocator
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*/
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class LIBIMP_EXPORT allocator {
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};
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LIBPMR_NAMESPACE_END_
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