70 lines
1.8 KiB
C++
70 lines
1.8 KiB
C++
/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Copyright 2015 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef __UTIL_ALLOC_ALLOCATOR_HPP
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#define __UTIL_ALLOC_ALLOCATOR_HPP
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#include <cstddef>
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#include <utility>
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// C++11 allocator concept conformant allocator adaptor, going from our
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// allocator interface to that of the STL and friends.
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namespace util::alloc {
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template <typename ValueT, typename BackingT>
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class allocator {
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public:
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typedef ValueT value_type;
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template <typename ...Args>
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explicit allocator (Args&& ...args):
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m_backing (std::forward<Args> (args)...)
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{ ; }
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ValueT*
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allocate (size_t count)
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{
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return reinterpret_cast<ValueT*> (
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m_backing.template allocate (sizeof (ValueT) * count)
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);
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}
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void
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deallocate (ValueT *t, size_t count)
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{
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return m_backing.template deallocate (t, sizeof (ValueT) * count);
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}
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private:
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BackingT &m_backing;
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};
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///////////////////////////////////////////////////////////////////////////
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// convenience type-inferring constructor for allocators.
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template <typename ValueT, typename BackingT>
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auto
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make_allocator (BackingT &backing)
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{
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return allocator<ValueT,BackingT> (backing);
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}
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}
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#endif
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