100 lines
2.7 KiB
C++
100 lines
2.7 KiB
C++
// Copyright (c) 2015 Amanieu d'Antras
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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namespace async {
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namespace detail {
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// Allocate an aligned block of memory
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LIBASYNC_EXPORT void* aligned_alloc(std::size_t size, std::size_t align);
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// Free an aligned block of memory
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LIBASYNC_EXPORT void aligned_free(void* addr) LIBASYNC_NOEXCEPT;
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// Class representing an aligned array and its length
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template<typename T, std::size_t Align = std::alignment_of<T>::value>
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class aligned_array {
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std::size_t length;
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T* ptr;
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public:
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aligned_array()
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: length(0), ptr(nullptr) {}
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aligned_array(std::nullptr_t)
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: length(0), ptr(nullptr) {}
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explicit aligned_array(std::size_t length_)
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: length(length_)
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{
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ptr = static_cast<T*>(aligned_alloc(length * sizeof(T), Align));
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std::size_t i;
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LIBASYNC_TRY {
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for (i = 0; i < length; i++)
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new(ptr + i) T;
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} LIBASYNC_CATCH(...) {
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for (std::size_t j = 0; j < i; j++)
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ptr[i].~T();
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aligned_free(ptr);
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LIBASYNC_RETHROW();
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}
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}
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aligned_array(aligned_array&& other) LIBASYNC_NOEXCEPT
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: length(other.length), ptr(other.ptr)
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{
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other.ptr = nullptr;
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other.length = 0;
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}
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aligned_array& operator=(aligned_array&& other) LIBASYNC_NOEXCEPT
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{
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aligned_array(std::move(*this));
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std::swap(ptr, other.ptr);
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std::swap(length, other.length);
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return *this;
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}
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aligned_array& operator=(std::nullptr_t)
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{
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return *this = aligned_array();
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}
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~aligned_array()
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{
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for (std::size_t i = 0; i < length; i++)
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ptr[i].~T();
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aligned_free(ptr);
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}
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T& operator[](std::size_t i) const
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{
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return ptr[i];
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}
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std::size_t size() const
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{
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return length;
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}
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T* get() const
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{
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return ptr;
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}
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explicit operator bool() const
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{
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return ptr != nullptr;
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}
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};
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} // namespace detail
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} // namespace async
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