56 lines
1.8 KiB
C++
56 lines
1.8 KiB
C++
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/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright 2018 Danny Robson <danny@nerdcruft.net>
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*/
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#pragma once
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#include <type_traits>
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namespace cruft::alloc {
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///////////////////////////////////////////////////////////////////////////
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/// A trait that evaluates to true if the queried type models cruft::allocator
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template <
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typename AllocatorT,
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typename = std::void_t<>
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>
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struct is_allocator
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: public std::false_type
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{ };
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//-------------------------------------------------------------------------
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template <typename AllocatorT>
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struct is_allocator<AllocatorT,
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std::void_t<
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// Provides aligned and unaligned allocation
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decltype(std::declval<AllocatorT> ().allocate (0 )),
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decltype(std::declval<AllocatorT> ().allocate (0, 0)),
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//// Provides aligned an unaligned deallocation
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decltype(std::declval<AllocatorT> ().deallocate (nullptr, 0)),
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decltype(std::declval<AllocatorT> ().deallocate (nullptr, 0, 0)),
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//// Provides capacity/used/remain
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decltype(std::declval<AllocatorT> ().capacity ()),
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decltype(std::declval<AllocatorT> ().used ()),
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decltype(std::declval<AllocatorT> ().remain ()),
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decltype(std::declval<AllocatorT> ().begin ()),
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decltype(std::declval<AllocatorT> ().end ()),
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void
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>
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> : public std::true_type
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{ };
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//-------------------------------------------------------------------------
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template <typename AllocatorT>
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constexpr auto is_allocator_v = is_allocator<AllocatorT>::value;
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}
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