libcxx/test/std/numerics/numarray/template.valarray/valarray.assign/copy_assign.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // <valarray>
  10
  11 // template<class T> class valarray;
  12
  13 // valarray& operator=(const valarray& v);
  14
  15 #include <valarray>
  16 #include <cassert>
  17 #include <cstddef>
  18
  19 #include "test_macros.h"
  20
  21 struct S
  22 {
  23     S() : x_(0) { default_ctor_called = true; }
  24     S(int x) : x_(x) {}
  25     int x_;
  26     static bool default_ctor_called;
  27 };
  28
  29 bool S::default_ctor_called = false;
  30
  31 bool operator==(const S& lhs, const S& rhs)
  32 {
  33     return lhs.x_ == rhs.x_;
  34 }
  35
  36 int main(int, char**)
  37 {
  38     {
  39         typedef int T;
  40         T a[] = {1, 2, 3, 4, 5};
  41         const unsigned N = sizeof(a)/sizeof(a[0]);
  42         std::valarray<T> v(a, N);
  43         std::valarray<T> v2;
  44         v2 = v;
  45         assert(v2.size() == v.size());
  46         for (std::size_t i = 0; i < v2.size(); ++i)
  47             assert(v2[i] == v[i]);
  48     }
  49     {
  50         typedef double T;
  51         T a[] = {1, 2.5, 3, 4.25, 5};
  52         const unsigned N = sizeof(a)/sizeof(a[0]);
  53         std::valarray<T> v(a, N);
  54         std::valarray<T> v2;
  55         v2 = v;
  56         assert(v2.size() == v.size());
  57         for (std::size_t i = 0; i < v2.size(); ++i)
  58             assert(v2[i] == v[i]);
  59     }
  60     {
  61         typedef std::valarray<double> T;
  62         T a[] = {T(1), T(2), T(3), T(4), T(5)};
  63         const unsigned N = sizeof(a)/sizeof(a[0]);
  64         std::valarray<T> v(a, N);
  65         std::valarray<T> v2(a, N-2);
  66         v2 = v;
  67         assert(v2.size() == v.size());
  68         for (unsigned i = 0; i < N; ++i)
  69         {
  70             assert(v2[i].size() == v[i].size());
  71             for (std::size_t j = 0; j < v[i].size(); ++j)
  72                 assert(v2[i][j] == v[i][j]);
  73         }
  74     }
  75     {
  76         typedef S T;
  77         T a[] = {T(1), T(2), T(3), T(4), T(5)};
  78         const unsigned N = sizeof(a)/sizeof(a[0]);
  79         std::valarray<T> v(a, N);
  80         std::valarray<T> v2;
  81         v2 = v;
  82         assert(v2.size() == v.size());
  83         for (std::size_t i = 0; i < v2.size(); ++i)
  84             assert(v2[i] == v[i]);
  85         assert(!S::default_ctor_called);
  86     }
  87
  88   return 0;
  89 }