libstdc++-v3/testsuite/experimental/any/misc/any_cast.cc

   1 // { dg-options "-std=gnu++14" }
   2 // { dg-do run }
   3
   4 // Copyright (C) 2014-2016 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 #include <experimental/any>
  22 #include <string>
  23 #include <cstring>
  24 #include <testsuite_hooks.h>
  25
  26 using std::experimental::any;
  27 using std::experimental::any_cast;
  28
  29 void test01()
  30 {
  31   using std::string;
  32   using std::strcmp;
  33
  34   // taken from example in N3804 proposal
  35
  36   any x(5);                                   // x holds int
  37   VERIFY(any_cast<int>(x) == 5);              // cast to value
  38   any_cast<int&>(x) = 10;                     // cast to reference
  39   VERIFY(any_cast<int>(x) == 10);
  40
  41   x = "Meow";                                 // x holds const char*
  42   VERIFY(strcmp(any_cast<const char*>(x), "Meow") == 0);
  43   any_cast<const char*&>(x) = "Harry";
  44   VERIFY(strcmp(any_cast<const char*>(x), "Harry") == 0);
  45
  46   x = string("Meow");                         // x holds string
  47   string s, s2("Jane");
  48   s = move(any_cast<string&>(x));             // move from any
  49   VERIFY(s == "Meow");
  50   any_cast<string&>(x) = move(s2);            // move to any
  51   VERIFY(any_cast<const string&>(x) == "Jane");
  52
  53   string cat("Meow");
  54   const any y(cat);                           // const y holds string
  55   VERIFY(any_cast<const string&>(y) == cat);
  56 }
  57
  58 void test02()
  59 {
  60   using std::experimental::bad_any_cast;
  61   any x(1);
  62   auto p = any_cast<double>(&x);
  63   VERIFY(p == nullptr);
  64
  65   x = 1.0;
  66   p = any_cast<double>(&x);
  67   VERIFY(p != nullptr);
  68
  69   x = any();
  70   p = any_cast<double>(&x);
  71   VERIFY(p == nullptr);
  72
  73   try {
  74     any_cast<double>(x);
  75     VERIFY(false);
  76   } catch (const bad_any_cast&) {
  77   }
  78 }
  79
  80 int main()
  81 {
  82   test01();
  83   test02();
  84 }