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

   1 // { dg-options "-std=gnu++11" }
   2 // 2005-01-15 Douglas Gregor <dgregor@cs.indiana.edu>
   3 //
   4 // Copyright (C) 2005-2016 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 // 20.7.15 polymorphic function object wrapper
  22 #include <functional>
  23 #include <testsuite_hooks.h>
  24
  25 using namespace __gnu_test;
  26
  27 bool test __attribute__((unused)) = true;
  28
  29 // Operations on empty function<> objects
  30 void test01()
  31 {
  32   using std::function;
  33   using std::bad_function_call;
  34
  35   // Default-construction
  36   function<int(float)> f1;
  37   VERIFY( ((bool)f1 == false) );
  38   VERIFY( !f1 );
  39   VERIFY( f1 == 0 );
  40   VERIFY( 0 == f1 );
  41   VERIFY( !(f1 != 0) );
  42   VERIFY( !(0 != f1) );
  43
  44   // Copy-construction
  45   function<int(float)> f2(f1);
  46   VERIFY( !f2 );
  47
  48   // Construct with NULL pointer
  49   function<int(float)> f3(0);
  50   VERIFY( !f3 );
  51
  52   // Assignment
  53   f1 = f2;
  54   VERIFY( !f1);
  55
  56   // Assignment to NULL pointer
  57   f1 = 0;
  58   VERIFY( !f1 );
  59
  60   // Swap
  61   swap(f1, f2);
  62   VERIFY( !f1 );
  63   VERIFY( !f2 );
  64
  65   // Invocation should throw bad_function_call
  66   bool thrown = false;
  67   try
  68     {
  69       f1(3.14159f);
  70       VERIFY( false );
  71     }
  72   catch (bad_function_call)
  73     {
  74       thrown = true;
  75     }
  76   VERIFY( thrown );
  77
  78   // target_type returns typeid(void)
  79   VERIFY( f1.target_type() == typeid(void) );
  80
  81   // target() always returns a NULL pointer
  82   VERIFY( f1.target<int (*)(float)>() == 0);
  83
  84   // Check const version
  85   const function<int(float)>& f1c = f1;
  86   VERIFY( f1c.target<int (*)(float)>() == 0 );
  87   VERIFY( !f1c );
  88 }
  89
  90 int main()
  91 {
  92   test01();
  93   return 0;
  94 }