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64 lines
1.6 KiB
C++
64 lines
1.6 KiB
C++
// This file is distributed under the BSD License.
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// See "license.txt" for details.
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// Copyright 2009-2012, Jonathan Turner (jonathan@emptycrate.com)
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// Copyright 2009-2017, Jason Turner (jason@emptycrate.com)
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// http://www.chaiscript.com
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// This is an open source non-commercial project. Dear PVS-Studio, please check it.
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// PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
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#ifndef CHAISCRIPT_STACK_VECTOR_HPP_
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#define CHAISCRIPT_STACK_VECTOR_HPP_
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#include <cstdint>
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#include <type_traits>
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#include <string>
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template<typename T, std::size_t MaxSize>
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struct Stack_Vector
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{
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constexpr static auto aligned_size = sizeof(T) + (sizeof(T) & std::alignment_of_v<T>) > 0 ? std::alignment_of_v<T> : 0;
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alignas(std::alignment_of_v<T>) char data[aligned_size * MaxSize];
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[[nodiscard]] T & operator[](const std::size_t idx) noexcept {
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return *reinterpret_cast<T*>(&data + aligned_size * idx);
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}
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[[nodiscard]] const T & operator[](const std::size_t idx) const noexcept {
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return *reinterpret_cast<const T*>(&data + aligned_size * idx);
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}
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template<typename ... Param>
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T& emplace_back(Param && ... param) {
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auto *p = new(&(*this)[m_size++]) T(std::forward<Param>(param)...);
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return *p;
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};
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auto size() const noexcept {
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return m_size;
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};
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void pop_back() noexcept(std::is_nothrow_destructible_v<T>) {
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(*this)[--m_size].~T();
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}
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~Stack_Vector() noexcept(std::is_nothrow_destructible_v<T>)
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{
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auto loc = m_size - 1;
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for (std::size_t pos = 0; pos < m_size; ++pos) {
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(*this)[loc--].~T();
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}
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}
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std::size_t m_size{0};
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};
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#endif CHAISCRIPT_STACK_VECTOR_HPP_
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