💿🐜 Antkeeper source code
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136 lines
5.0 KiB
136 lines
5.0 KiB
/*
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* Copyright (C) 2021 Christopher J. Howard
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*
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* This file is part of Antkeeper source code.
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*
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* Antkeeper source code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Antkeeper source code is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef ANTKEEPER_MATH_VECTOR_TYPE_HPP
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#define ANTKEEPER_MATH_VECTOR_TYPE_HPP
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#include <array>
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#include <cstddef>
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namespace math {
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/**
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* An `N`-dimensional Euclidean vector.
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*
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* @tparam T Vector component type.
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* @tparam N Number of dimensions.
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*/
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template <typename T, std::size_t N>
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struct vector
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{
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typedef T scalar_type;
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typedef std::array<T, N> array_type;
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scalar_type components[N];
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inline constexpr scalar_type& operator[](std::size_t i) noexcept { return components[i]; }
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inline constexpr const scalar_type& operator[](std::size_t i) const noexcept { return components[i]; }
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inline constexpr operator array_type&() noexcept { return reinterpret_cast<array_type&>(components[0]); }
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inline constexpr operator const array_type&() const noexcept { return reinterpret_cast<const array_type&>(components[0]); }
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inline constexpr const scalar_type* data() const noexcept { return components; };
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inline constexpr scalar_type* data() noexcept { return components; };
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inline constexpr std::size_t size() const noexcept { return N; };
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};
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template <typename T>
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struct vector<T, 1>
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{
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typedef T scalar_type;
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typedef std::array<T, 1> array_type;
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scalar_type x;
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inline constexpr scalar_type& operator[](std::size_t i) noexcept { return *((&x) + i); }
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inline constexpr const scalar_type& operator[](std::size_t i) const noexcept { return *((&x) + i); }
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inline constexpr operator array_type&() noexcept { return reinterpret_cast<array_type&>(x); }
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inline constexpr operator const array_type&() const noexcept { return reinterpret_cast<const array_type&>(x); }
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inline constexpr const scalar_type* data() const noexcept { return &x; };
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inline constexpr scalar_type* data() noexcept { return &x; };
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inline constexpr std::size_t size() const noexcept { return 1; };
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};
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template <typename T>
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struct vector<T, 2>
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{
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typedef T scalar_type;
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typedef std::array<T, 2> array_type;
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scalar_type x;
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scalar_type y;
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inline constexpr scalar_type& operator[](std::size_t i) noexcept { return *((&x) + i); }
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inline constexpr const scalar_type& operator[](std::size_t i) const noexcept { return *((&x) + i); }
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inline constexpr operator array_type&() noexcept { return reinterpret_cast<array_type&>(x); }
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inline constexpr operator const array_type&() const noexcept { return reinterpret_cast<const array_type&>(x); }
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inline constexpr const scalar_type* data() const noexcept { return &x; };
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inline constexpr scalar_type* data() noexcept { return &x; };
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inline constexpr std::size_t size() const noexcept { return 2; };
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};
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template <typename T>
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struct vector<T, 3>
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{
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typedef T scalar_type;
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typedef std::array<T, 3> array_type;
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scalar_type x;
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scalar_type y;
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scalar_type z;
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inline constexpr scalar_type& operator[](std::size_t i) noexcept { return *((&x) + i); }
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inline constexpr const scalar_type& operator[](std::size_t i) const noexcept { return *((&x) + i); }
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inline constexpr operator array_type&() noexcept { return reinterpret_cast<array_type&>(x); }
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inline constexpr operator const array_type&() const noexcept { return reinterpret_cast<const array_type&>(x); }
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inline constexpr const scalar_type* data() const noexcept { return &x; };
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inline constexpr scalar_type* data() noexcept { return &x; };
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inline constexpr std::size_t size() const noexcept { return 3; };
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};
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template <typename T>
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struct vector<T, 4>
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{
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typedef T scalar_type;
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typedef std::array<T, 4> array_type;
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scalar_type x;
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scalar_type y;
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scalar_type z;
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scalar_type w;
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inline constexpr scalar_type& operator[](std::size_t i) noexcept { return *((&x) + i); }
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inline constexpr const scalar_type& operator[](std::size_t i) const noexcept { return *((&x) + i); }
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inline constexpr operator array_type&() noexcept { return reinterpret_cast<array_type&>(x); }
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inline constexpr operator const array_type&() const noexcept { return reinterpret_cast<const array_type&>(x); }
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inline constexpr const scalar_type* data() const noexcept { return &x; };
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inline constexpr scalar_type* data() noexcept { return &x; };
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inline constexpr std::size_t size() const noexcept { return 4; };
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};
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/// 2D vector.
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template <typename T>
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using vector2 = vector<T, 2>;
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/// 3D vector.
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template <typename T>
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using vector3 = vector<T, 3>;
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/// 4D vector.
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template <typename T>
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using vector4 = vector<T, 4>;
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} // namespace math
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#endif // ANTKEEPER_MATH_VECTOR_TYPE_HPP
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