From 8423161d6b1714905642e1b5ac69e5c5ee2f2bca Mon Sep 17 00:00:00 2001
From: Oliver Hahn <oliverjhahn@gmail.com>
Date: Sun, 29 Mar 2020 14:46:25 +0200
Subject: [PATCH] added new vector type for vectorized operations

---
 include/vec.hh | 144 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 144 insertions(+)
 create mode 100644 include/vec.hh

diff --git a/include/vec.hh b/include/vec.hh
new file mode 100644
index 0000000..dd914b0
--- /dev/null
+++ b/include/vec.hh
@@ -0,0 +1,144 @@
+#pragma once
+/*******************************************************************************\
+ vec.hh - This file is part of MUSIC2 -
+ a code to generate initial conditions for cosmological simulations 
+ 
+ CHANGELOG (only majors, for details see repo):
+    06/2019 - Oliver Hahn - first implementation
+\*******************************************************************************/
+
+#include <array>
+
+//! implements general N-dim vectors of arbitrary primtive type with some arithmetic ops
+template <int N, typename T = double>
+struct vec_t
+{
+  std::array<T, N> data_;
+
+  vec_t() {}
+
+  vec_t(const vec_t<N, T> &v)
+      : data_(v.data_) {}
+
+  vec_t(vec_t<N, T> &&v)
+      : data_(std::move(v.data_)) {}
+
+  template <typename... E>
+  vec_t(E... e)
+      : data_{{std::forward<E>(e)...}}
+  {
+    static_assert(sizeof...(E) == N, "Brace-enclosed initialiser list doesn't match vec_t length!");
+  }
+
+  //! bracket index access to vector components
+  T &operator[](size_t i) noexcept { return data_[i]; }
+
+  //! const bracket index access to vector components
+  const T &operator[](size_t i) const noexcept { return data_[i]; }
+
+  // assignment operator
+  vec_t<N, T> &operator=(const vec_t<N, T> &v) noexcept
+  {
+    data_ = v.data_;
+    return *this;
+  }
+
+  //! implementation of summation of vec_t
+  vec_t<N, T> operator+(const vec_t<N, T> &v) const noexcept
+  {
+    vec_t<N, T> res;
+    for (int i = 0; i < N; ++i)
+      res[i] = data_[i] + v[i];
+    return res;
+  }
+
+  //! implementation of difference of vec_t
+  vec_t<N, T> operator-(const vec_t<N, T> &v) const noexcept
+  {
+    vec_t<N, T> res;
+    for (int i = 0; i < N; ++i)
+      res[i] = data_[i] - v[i];
+    return res;
+  }
+
+  //! implementation of unary negative
+  vec_t<N, T> operator-() const noexcept
+  {
+    vec_t<N, T> res;
+    for (int i = 0; i < N; ++i)
+      res[i] = -data_[i];
+    return res;
+  }
+
+  //! implementation of scalar multiplication
+  template <typename T2>
+  vec_t<N, T> operator*(T2 s) const noexcept
+  {
+    vec_t<N, T> res;
+    for (int i = 0; i < N; ++i)
+      res[i] = data_[i] * s;
+    return res;
+  }
+
+  //! implementation of scalar division
+  vec_t<N, T> operator/(T s) const noexcept
+  {
+    vec_t<N, T> res;
+    for (int i = 0; i < N; ++i)
+      res[i] = data_[i] / s;
+    return res;
+  }
+
+  //! takes the absolute value of each element
+  vec_t<N, T> abs(void) const noexcept
+  {
+    vec_t<N, T> res;
+    for (int i = 0; i < N; ++i)
+      res[i] = std::abs(data_[i]);
+    return res;
+  }
+
+  //! implementation of implicit summation of vec_t
+  vec_t<N, T> &operator+=(const vec_t<N, T> &v) noexcept
+  {
+    for (int i = 0; i < N; ++i)
+      data_[i] += v[i];
+    return *this;
+  }
+
+  //! implementation of implicit subtraction of vec_t
+  vec_t<N, T> &operator-=(const vec_t<N, T> &v) noexcept
+  {
+    for (int i = 0; i < N; ++i)
+      data_[i] -= v[i];
+    return *this;
+  }
+
+  //! implementation of implicit scalar multiplication of vec_t
+  vec_t<N, T> &operator*=(T s) noexcept
+  {
+    for (int i = 0; i < N; ++i)
+      data_[i] *= s;
+    return *this;
+  }
+
+  //! implementation of implicit scalar division of vec_t
+  vec_t<N, T> &operator/=(T s) noexcept
+  {
+    for (int i = 0; i < N; ++i)
+      data_[i] /= s;
+    return *this;
+  }
+
+  size_t size(void) const noexcept { return N; }
+};
+
+//! multiplication with scalar
+template <typename T2, int N, typename T = double>
+inline vec_t<N, T> operator*(T2 s, const vec_t<N, T> &v)
+{
+  vec_t<N, T> res;
+  for (int i = 0; i < N; ++i)
+    res[i] = v[i] * s;
+  return res;
+}