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/** | ||
Copyright (c) 2022, Philip Deegan. | ||
All rights reserved. | ||
Redistribution and use in source and binary forms, with or without | ||
modification, are permitted provided that the following conditions are | ||
met: | ||
* Redistributions of source code must retain the above copyright | ||
notice, this list of conditions and the following disclaimer. | ||
* Redistributions in binary form must reproduce the above | ||
copyright notice, this list of conditions and the following disclaimer | ||
in the documentation and/or other materials provided with the | ||
distribution. | ||
* Neither the name of Philip Deegan nor the names of its | ||
contributors may be used to endorse or promote products derived from | ||
this software without specific prior written permission. | ||
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | ||
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | ||
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | ||
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | ||
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | ||
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | ||
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | ||
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
*/ | ||
#ifndef _MKN_KUL_ALLOC_BASE_HPP_ | ||
#define _MKN_KUL_ALLOC_BASE_HPP_ | ||
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#include <new> | ||
#include <cstdint> | ||
#include <cstddef> | ||
#include <cstdlib> | ||
#include <type_traits> | ||
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namespace mkn::kul { | ||
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template <typename T> | ||
class Allocator { | ||
using This = Allocator<T>; | ||
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public: | ||
using pointer = T*; | ||
using reference = T&; | ||
using value_type = T; | ||
using size_type = std::size_t; | ||
using difference_type = std::ptrdiff_t; | ||
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template <typename U> | ||
struct rebind { | ||
using other = Allocator<U>; | ||
}; | ||
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T* allocate(std::size_t const n) const { return static_cast<T*>(::operator new(n * sizeof(T))); } | ||
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void deallocate(T* const p) noexcept { | ||
if (p) ::operator delete(p); | ||
} | ||
void deallocate(T* const p, std::size_t /*n*/) noexcept { // needed from std:: | ||
if (p) ::operator delete(p); | ||
} | ||
bool operator!=(This const& that) const { return !(*this == that); } | ||
bool operator==(This const& /*that*/) const { | ||
return true; // stateless | ||
} | ||
}; | ||
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template <typename T, std::int32_t alignment = 32> | ||
class AlignedAllocator : public Allocator<T> { | ||
using This = AlignedAllocator<T, alignment>; | ||
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public: | ||
using pointer = T*; | ||
using reference = T&; | ||
using value_type = T; | ||
using size_type = std::size_t; | ||
using difference_type = std::ptrdiff_t; | ||
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template <typename U> | ||
struct rebind { | ||
using other = AlignedAllocator<U, alignment>; | ||
}; | ||
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T* allocate(std::size_t const n) const { | ||
if (n == 0) return nullptr; | ||
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auto size = n * sizeof(T); | ||
std::uint32_t diff = size % alignment; | ||
if (diff > 0) diff = alignment - diff; | ||
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void* p = std::aligned_alloc(alignment, size + diff); | ||
if (!p) throw std::bad_alloc(); | ||
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return static_cast<T*>(p); | ||
} | ||
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void deallocate(T* const p) noexcept { | ||
if (p) std::free(p); | ||
} | ||
void deallocate(T* const p, std::size_t /*n*/) noexcept { // needed from std:: | ||
deallocate(p); | ||
} | ||
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bool operator!=(This const& that) const { return !(*this == that); } | ||
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bool operator==(This const& /*that*/) const { | ||
return true; // stateless | ||
} | ||
}; | ||
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template <typename T> | ||
class NonConstructingAllocator : public Allocator<T> { | ||
using This = NonConstructingAllocator<T>; | ||
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public: | ||
template <typename U> | ||
struct rebind { | ||
using other = NonConstructingAllocator<U>; | ||
}; | ||
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T* allocate(std::size_t const n) const { | ||
// if (n == 0) return nullptr; | ||
return static_cast<T*>(malloc(n * sizeof(T))); | ||
} | ||
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template <typename U, typename... Args> | ||
void construct(U* ptr, Args&&... args) { | ||
::new ((void*)ptr) U(std::forward<Args>(args)...); | ||
} | ||
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template <typename U> | ||
void construct(U* /*ptr*/) noexcept(std::is_nothrow_default_constructible<U>::value) {} | ||
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bool operator!=(This const& that) const { return !(*this == that); } | ||
bool operator==(This const& /*that*/) const { | ||
return true; // stateless | ||
} | ||
}; | ||
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} // namespace mkn::kul | ||
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#endif /*_MKN_KUL_ALLOC_BASE_HPP_*/ |
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