libcxx/test/std/numerics/numarray/template.valarray/valarray.members/apply_cref.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 apply(value_type f(const value_type&)) const;
  14
  15 #include <valarray>
  16 #include <cassert>
  17
  18 #include "test_macros.h"
  19
  20 typedef int T;
  21
  22 T f(const T& t) {return t + 5;}
  23
  24 int main(int, char**)
  25 {
  26     {
  27         T a1[] = {1, 2, 3, 4,  5,  6,  7,  8,  9, 10};
  28         T a2[] = {6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
  29         const unsigned N1 = sizeof(a1)/sizeof(a1[0]);
  30         std::valarray<T> v1(a1, N1);
  31         std::valarray<T> v2 = v1.apply(f);
  32         assert(v2.size() == N1);
  33         for (unsigned i = 0; i < N1; ++i)
  34             assert(v2[i] == a2[i]);
  35     }
  36     {
  37         const unsigned N1 = 0;
  38         std::valarray<T> v1;
  39         std::valarray<T> v2 = v1.apply(f);
  40         assert(v2.size() == N1);
  41     }
  42     {
  43         T a1[] = {1, 2, 3, 4,  5,  6,  7,  8,  9, 10};
  44         T a2[] = {7, 9, 11, 13, 15, 17, 19, 21, 23, 25};
  45         const unsigned N1 = sizeof(a1)/sizeof(a1[0]);
  46         std::valarray<T> v1(a1, N1);
  47         std::valarray<T> v2 = (v1+v1).apply(f);
  48         assert(v2.size() == N1);
  49         for (unsigned i = 0; i < N1; ++i)
  50             assert(v2[i] == a2[i]);
  51     }
  52
  53   return 0;
  54 }