libstdc++-v3/testsuite/tr1/3_function_objects/function/6.cc

   1 // 2005-01-15 Douglas Gregor <dgregor@cs.indiana.edu>
   2 //
   3 // Copyright (C) 2005-2016 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 3, 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 COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 // 3.7.2 polymorphic function object wrapper
  21 #include <tr1/functional>
  22 #include <testsuite_hooks.h>
  23 #include <testsuite_tr1.h>
  24
  25 using namespace __gnu_test;
  26
  27 bool test __attribute__((unused)) = true;
  28
  29 struct secret {};
  30
  31 struct noncopyable_function_object_type
  32 {
  33   noncopyable_function_object_type(secret) {}
  34
  35   int operator()() const { return 42; }
  36   int operator()()       { return 17; }
  37
  38  private:
  39   noncopyable_function_object_type();
  40   noncopyable_function_object_type(const noncopyable_function_object_type&);
  41   void operator=(const noncopyable_function_object_type&);
  42 };
  43
  44 // Put reference_wrappers into function<> wrappers
  45 void test06()
  46 {
  47   using std::tr1::function;
  48   using std::tr1::ref;
  49   using std::tr1::cref;
  50
  51   secret password;
  52   noncopyable_function_object_type x(password);
  53
  54   function<int()> f(ref(x));
  55   VERIFY( f );
  56   VERIFY( f() == 17 );
  57   VERIFY( f.target_type() == typeid(noncopyable_function_object_type) );
  58   VERIFY( f.target<noncopyable_function_object_type>() == &x );
  59
  60   function<int()> g = f;
  61   VERIFY( g );
  62   VERIFY( g() == 17 );
  63   VERIFY( g.target_type() == typeid(noncopyable_function_object_type) );
  64   VERIFY( g.target<noncopyable_function_object_type>() == &x );
  65
  66   function<int()> h = cref(x);
  67   VERIFY( h );
  68   VERIFY( h() == 42 );
  69   VERIFY( h.target_type() == typeid(noncopyable_function_object_type) );
  70   VERIFY( h.target<const noncopyable_function_object_type>() == &x );
  71   VERIFY( h.target<const noncopyable_function_object_type>() == &x );
  72
  73   const function<int()>& hc = h;
  74   VERIFY( h.target<noncopyable_function_object_type>() == 0 );
  75   VERIFY( hc.target<noncopyable_function_object_type>() == &x );
  76 }
  77
  78 int main()
  79 {
  80   test06();
  81   return 0;
  82 }