libstdc++-v3/testsuite/20_util/function/1.cc

   1 // { dg-do run { target c++11 } }
   2 // 2005-01-15 Douglas Gregor <dgregor@cs.indiana.edu>
   3 //
   4 // Copyright (C) 2005-2020 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 // 20.7.15 polymorphic function object wrapper
  22 #include <functional>
  23 #include <testsuite_hooks.h>
  24
  25 using namespace __gnu_test;
  26
  27 // Operations on empty function<> objects
  28 void test01()
  29 {
  30   using std::function;
  31   using std::bad_function_call;
  32
  33   // Default-construction
  34   function<int(float)> f1;
  35   VERIFY( ((bool)f1 == false) );
  36   VERIFY( !f1 );
  37   VERIFY( f1 == 0 );
  38   VERIFY( 0 == f1 );
  39   VERIFY( !(f1 != 0) );
  40   VERIFY( !(0 != f1) );
  41
  42   // Copy-construction
  43   function<int(float)> f2(f1);
  44   VERIFY( !f2 );
  45
  46   // Construct with NULL pointer
  47   function<int(float)> f3(0);
  48   VERIFY( !f3 );
  49
  50   // Assignment
  51   f1 = f2;
  52   VERIFY( !f1);
  53
  54   // Assignment to NULL pointer
  55   f1 = 0;
  56   VERIFY( !f1 );
  57
  58   // Swap
  59   swap(f1, f2);
  60   VERIFY( !f1 );
  61   VERIFY( !f2 );
  62
  63   // Invocation should throw bad_function_call
  64   bool thrown = false;
  65   try
  66     {
  67       f1(3.14159f);
  68       VERIFY( false );
  69     }
  70   catch (bad_function_call)
  71     {
  72       thrown = true;
  73     }
  74   VERIFY( thrown );
  75
  76   // target_type returns typeid(void)
  77   VERIFY( f1.target_type() == typeid(void) );
  78
  79   // target() always returns a NULL pointer
  80   VERIFY( f1.target<int (*)(float)>() == 0);
  81
  82   // Check const version
  83   const function<int(float)>& f1c = f1;
  84   VERIFY( f1c.target<int (*)(float)>() == 0 );
  85   VERIFY( !f1c );
  86 }
  87
  88 int main()
  89 {
  90   test01();
  91   return 0;
  92 }