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

   1 // 2005-01-15 Douglas Gregor <dgregor@cs.indiana.edu>
   2 //
   3 // Copyright (C) 2005-2024 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 struct secret {};
  28
  29 struct noncopyable_function_object_type
  30 {
  31   noncopyable_function_object_type(secret) {}
  32
  33   int operator()() const { return 42; }
  34   int operator()()       { return 17; }
  35
  36  private:
  37   noncopyable_function_object_type();
  38   noncopyable_function_object_type(const noncopyable_function_object_type&);
  39   void operator=(const noncopyable_function_object_type&);
  40 };
  41
  42 // Put reference_wrappers into function<> wrappers
  43 void test06()
  44 {
  45   using std::tr1::function;
  46   using std::tr1::ref;
  47   using std::tr1::cref;
  48
  49   secret password;
  50   noncopyable_function_object_type x(password);
  51
  52   function<int()> f(ref(x));
  53   VERIFY( f );
  54   VERIFY( f() == 17 );
  55 #if __cpp_rtti
  56   VERIFY( f.target_type() == typeid(noncopyable_function_object_type) );
  57   VERIFY( f.target<noncopyable_function_object_type>() == &x );
  58 #endif
  59
  60   function<int()> g = f;
  61   VERIFY( g );
  62   VERIFY( g() == 17 );
  63 #if __cpp_rtti
  64   VERIFY( g.target_type() == typeid(noncopyable_function_object_type) );
  65   VERIFY( g.target<noncopyable_function_object_type>() == &x );
  66 #endif
  67
  68   function<int()> h = cref(x);
  69   VERIFY( h );
  70   VERIFY( h() == 42 );
  71 #if __cpp_rtti
  72   VERIFY( h.target_type() == typeid(noncopyable_function_object_type) );
  73   VERIFY( h.target<const noncopyable_function_object_type>() == &x );
  74   VERIFY( h.target<const noncopyable_function_object_type>() == &x );
  75
  76   const function<int()>& hc = h;
  77   VERIFY( h.target<noncopyable_function_object_type>() == 0 );
  78   VERIFY( hc.target<noncopyable_function_object_type>() == &x );
  79 #endif
  80 }
  81
  82 int main()
  83 {
  84   test06();
  85   return 0;
  86 }