gomp-20050608-branch/libstdc++-v3/testsuite/tr1/3_function_objects/function/3.cc

   1 // 2005-01-15 Douglas Gregor <dgregor@cs.indiana.edu>
   2 //
   3 // Copyright (C) 2005 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 2, or (at your option)
   9 // any later version.
  10 //
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15 //
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING.  If not, write to the Free
  18 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  19 // USA.
  20
  21 // 3.7.2 polymorphic function object wrapper
  22 #include <tr1/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 nearly-matching function pointers into function<> wrappers
  31 void test03()
  32 {
  33   using std::tr1::function;
  34
  35   function<int(float)> f1(truncate_double);
  36   VERIFY( f1 );
  37   VERIFY( !!f1 );
  38   VERIFY( !(f1 == 0) );
  39   VERIFY( !(0 == f1) );
  40   VERIFY( f1 != 0 );
  41   VERIFY( 0 != f1 );
  42
  43   // Copy-construction
  44   function<int(float)> f2(f1);
  45   VERIFY( f2 );
  46
  47   // Invocation
  48   VERIFY( f1(3.1f) == 3 );
  49   VERIFY( f2(3.1f) == 3 );
  50
  51   // Assignment to zero
  52   f1 = 0;
  53   VERIFY( !f1 );
  54
  55   // Swap
  56   f1.swap(f2);
  57   VERIFY( f1 );
  58   VERIFY( !f2 );
  59   VERIFY( f1(3.1f) == 3 );
  60
  61   // Assignment from a function pointer
  62   f2 = truncate_double;
  63   VERIFY( f2(3.1f) == 3 );
  64
  65   // target_type and target() functions
  66   const function<int(float)>& f1c = f1;
  67   VERIFY( typeid(long(*)(double)) == f1.target_type() );
  68   VERIFY( f2.target<long(*)(double)>() != 0 );
  69   VERIFY( *f2.target<long(*)(double)>() == &truncate_double );
  70   VERIFY( f1c.target<long(*)(double)>() != 0 );
  71   VERIFY( *f1c.target<long(*)(double)>() == &truncate_double );
  72 }
  73
  74 int main()
  75 {
  76   test03();
  77   return 0;
  78 }