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added new vector type for vectorized operations
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include/vec.hh
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144
include/vec.hh
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#pragma once
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/*******************************************************************************\
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vec.hh - This file is part of MUSIC2 -
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a code to generate initial conditions for cosmological simulations
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CHANGELOG (only majors, for details see repo):
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06/2019 - Oliver Hahn - first implementation
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\*******************************************************************************/
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#include <array>
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//! implements general N-dim vectors of arbitrary primtive type with some arithmetic ops
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template <int N, typename T = double>
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struct vec_t
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{
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std::array<T, N> data_;
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vec_t() {}
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vec_t(const vec_t<N, T> &v)
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: data_(v.data_) {}
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vec_t(vec_t<N, T> &&v)
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: data_(std::move(v.data_)) {}
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template <typename... E>
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vec_t(E... e)
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: data_{{std::forward<E>(e)...}}
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{
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static_assert(sizeof...(E) == N, "Brace-enclosed initialiser list doesn't match vec_t length!");
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}
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//! bracket index access to vector components
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T &operator[](size_t i) noexcept { return data_[i]; }
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//! const bracket index access to vector components
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const T &operator[](size_t i) const noexcept { return data_[i]; }
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// assignment operator
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vec_t<N, T> &operator=(const vec_t<N, T> &v) noexcept
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{
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data_ = v.data_;
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return *this;
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}
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//! implementation of summation of vec_t
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vec_t<N, T> operator+(const vec_t<N, T> &v) const noexcept
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{
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vec_t<N, T> res;
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for (int i = 0; i < N; ++i)
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res[i] = data_[i] + v[i];
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return res;
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}
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//! implementation of difference of vec_t
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vec_t<N, T> operator-(const vec_t<N, T> &v) const noexcept
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{
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vec_t<N, T> res;
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for (int i = 0; i < N; ++i)
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res[i] = data_[i] - v[i];
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return res;
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}
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//! implementation of unary negative
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vec_t<N, T> operator-() const noexcept
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{
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vec_t<N, T> res;
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for (int i = 0; i < N; ++i)
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res[i] = -data_[i];
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return res;
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}
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//! implementation of scalar multiplication
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template <typename T2>
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vec_t<N, T> operator*(T2 s) const noexcept
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{
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vec_t<N, T> res;
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for (int i = 0; i < N; ++i)
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res[i] = data_[i] * s;
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return res;
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}
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//! implementation of scalar division
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vec_t<N, T> operator/(T s) const noexcept
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{
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vec_t<N, T> res;
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for (int i = 0; i < N; ++i)
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res[i] = data_[i] / s;
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return res;
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}
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//! takes the absolute value of each element
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vec_t<N, T> abs(void) const noexcept
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{
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vec_t<N, T> res;
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for (int i = 0; i < N; ++i)
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res[i] = std::abs(data_[i]);
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return res;
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}
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//! implementation of implicit summation of vec_t
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vec_t<N, T> &operator+=(const vec_t<N, T> &v) noexcept
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{
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for (int i = 0; i < N; ++i)
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data_[i] += v[i];
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return *this;
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}
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//! implementation of implicit subtraction of vec_t
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vec_t<N, T> &operator-=(const vec_t<N, T> &v) noexcept
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{
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for (int i = 0; i < N; ++i)
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data_[i] -= v[i];
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return *this;
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}
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//! implementation of implicit scalar multiplication of vec_t
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vec_t<N, T> &operator*=(T s) noexcept
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{
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for (int i = 0; i < N; ++i)
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data_[i] *= s;
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return *this;
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}
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//! implementation of implicit scalar division of vec_t
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vec_t<N, T> &operator/=(T s) noexcept
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{
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for (int i = 0; i < N; ++i)
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data_[i] /= s;
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return *this;
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}
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size_t size(void) const noexcept { return N; }
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};
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//! multiplication with scalar
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template <typename T2, int N, typename T = double>
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inline vec_t<N, T> operator*(T2 s, const vec_t<N, T> &v)
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{
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vec_t<N, T> res;
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for (int i = 0; i < N; ++i)
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res[i] = v[i] * s;
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return res;
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}
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