75 lines
2.0 KiB
C++
75 lines
2.0 KiB
C++
/*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*
|
|
* Copyright 2015-2018 Danny Robson <danny@nerdcruft.net>
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include "../view.hpp"
|
|
|
|
#include <cstddef>
|
|
#include <utility>
|
|
|
|
// C++11 allocator concept conformant(ish) allocator adaptor, going from our
|
|
// allocator interface to that of the STL and friends.
|
|
namespace util::alloc {
|
|
template <typename ValueT, typename BackingT>
|
|
class allocator {
|
|
public:
|
|
typedef ValueT value_type;
|
|
|
|
|
|
template <typename ...Args>
|
|
explicit allocator (Args&& ...args):
|
|
m_backing (std::forward<Args> (args)...)
|
|
{ ; }
|
|
|
|
|
|
util::view<ValueT*>
|
|
allocate (size_t count)
|
|
{
|
|
return {
|
|
reinterpret_cast<ValueT*> (
|
|
m_backing.template allocate (
|
|
sizeof (ValueT) * count,
|
|
alignof (ValueT)
|
|
)
|
|
),
|
|
count
|
|
};
|
|
}
|
|
|
|
|
|
void
|
|
deallocate (ValueT *t, size_t count)
|
|
{
|
|
return m_backing.template deallocate (t, sizeof (ValueT) * count);
|
|
}
|
|
|
|
|
|
private:
|
|
BackingT &m_backing;
|
|
};
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////
|
|
// convenience type-inferring constructor for allocators.
|
|
template <typename ValueT, typename BackingT>
|
|
auto
|
|
make_allocator (BackingT &backing)
|
|
{
|
|
return allocator<ValueT,BackingT> (backing);
|
|
}
|
|
}
|