libstdc++-v3/testsuite/20_util/function/7.cc

   1 // { dg-options "-std=gnu++0x" }
   2 // 2005-01-15 Douglas Gregor <dgregor@cs.indiana.edu>
   3 //
   4 // Copyright (C) 2005-2013 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 #include <testsuite_tr1.h>
  25
  26 using namespace __gnu_test;
  27
  28 bool test __attribute__((unused)) = true;
  29
  30 // Put reference_wrappers to function pointers into function<> wrappers
  31 void test07()
  32 {
  33   using std::function;
  34   using std::ref;
  35   using std::cref;
  36
  37   int (*fptr)(float) = truncate_float;
  38
  39   function<int(float)> f1(ref(fptr));
  40   VERIFY( f1 );
  41   VERIFY( !!f1 );
  42   VERIFY( !(f1 == 0) );
  43   VERIFY( !(0 == f1) );
  44   VERIFY( f1 != 0 );
  45   VERIFY( 0 != f1 );
  46
  47   // Invocation
  48   VERIFY( f1(3.1f) == 3 );
  49
  50   // target_type and target() functions
  51   const function<int(float)>& f1c = f1;
  52   VERIFY( typeid(int(*)(float)) == f1.target_type() );
  53   VERIFY( f1.target<int(*)(float)>() != 0 );
  54   VERIFY( f1.target<int(*)(float)>() == &fptr );
  55   VERIFY( f1c.target<int(*)(float)>() != 0 );
  56   VERIFY( f1c.target<int(*)(float)>() == &fptr );
  57
  58   function<int(float)> f2(cref(fptr));
  59   VERIFY( f2 );
  60   VERIFY( !!f2 );
  61   VERIFY( !(f2 == 0) );
  62   VERIFY( !(0 == f2) );
  63   VERIFY( f2 != 0 );
  64   VERIFY( 0 != f2 );
  65
  66   // Invocation
  67   VERIFY( f2(3.1f) == 3 );
  68
  69   // target_type and target() functions
  70   const function<int(float)>& f2c = f2;
  71   VERIFY( typeid(int(*)(float)) == f2.target_type() );
  72   VERIFY( f2.target<int(*)(float)>() == 0 );
  73   VERIFY( f2.target<int(* const)(float)>() == &fptr );
  74   VERIFY( f2c.target<int(*)(float)>() != 0 );
  75   VERIFY( f2c.target<int(*)(float)>() == &fptr );
  76 }
  77
  78 int main()
  79 {
  80   test07();
  81   return 0;
  82 }