libcxx/test/std/numerics/numarray/template.valarray/valarray.cons/default.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();
  14
  15 #include <valarray>
  16 #include <cassert>
  17
  18 #include "test_macros.h"
  19
  20 struct S {
  21     S() { ctor_called = true; }
  22     static bool ctor_called;
  23 };
  24
  25 bool S::ctor_called = false;
  26
  27 int main(int, char**)
  28 {
  29     {
  30         std::valarray<int> v;
  31         assert(v.size() == 0);
  32     }
  33     {
  34         std::valarray<float> v;
  35         assert(v.size() == 0);
  36     }
  37     {
  38         std::valarray<double> v;
  39         assert(v.size() == 0);
  40     }
  41     {
  42         std::valarray<std::valarray<double> > v;
  43         assert(v.size() == 0);
  44     }
  45     {
  46         std::valarray<S> v;
  47         assert(v.size() == 0);
  48         assert(!S::ctor_called);
  49     }
  50
  51   return 0;
  52 }