gomp-20050608-branch/libstdc++-v3/testsuite/tr1/3_function_objects/function/6.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 struct secret {};
  31
  32 struct noncopyable_function_object_type
  33 {
  34   noncopyable_function_object_type(secret) {}
  35
  36   int operator()() const { return 42; }
  37   int operator()()       { return 17; }
  38
  39  private:
  40   noncopyable_function_object_type();
  41   noncopyable_function_object_type(const noncopyable_function_object_type&);
  42   void operator=(const noncopyable_function_object_type&);
  43 };
  44
  45 // Put reference_wrappers into function<> wrappers
  46 void test06()
  47 {
  48   using std::tr1::function;
  49   using std::tr1::ref;
  50   using std::tr1::cref;
  51
  52   secret password;
  53   noncopyable_function_object_type x(password);
  54
  55   function<int()> f(ref(x));
  56   VERIFY( f );
  57   VERIFY( f() == 17 );
  58   VERIFY( f.target_type() == typeid(noncopyable_function_object_type) );
  59   VERIFY( f.target<noncopyable_function_object_type>() == &x );
  60
  61   function<int()> g = f;
  62   VERIFY( g );
  63   VERIFY( g() == 17 );
  64   VERIFY( g.target_type() == typeid(noncopyable_function_object_type) );
  65   VERIFY( g.target<noncopyable_function_object_type>() == &x );
  66
  67   function<int()> h = cref(x);
  68   VERIFY( h );
  69   VERIFY( h() == 42 );
  70   VERIFY( h.target_type() == typeid(noncopyable_function_object_type) );
  71   VERIFY( h.target<const noncopyable_function_object_type>() == &x );
  72   VERIFY( h.target<const noncopyable_function_object_type>() == &x );
  73
  74   const function<int()>& hc = h;
  75   VERIFY( h.target<noncopyable_function_object_type>() == 0 );
  76   VERIFY( hc.target<noncopyable_function_object_type>() == &x );
  77 }
  78
  79 int main()
  80 {
  81   test06();
  82   return 0;
  83 }