libstdc++-v3/testsuite/20_util/function/8.cc

   1 // { dg-do run { target c++11 } }
   2 // { dg-require-effective-target hosted }
   3
   4 // 2005-01-15 Douglas Gregor <dgregor@cs.indiana.edu>
   5 //
   6 // Copyright (C) 2005-2023 Free Software Foundation, Inc.
   7 //
   8 // This file is part of the GNU ISO C++ Library.  This library is free
   9 // software; you can redistribute it and/or modify it under the
  10 // terms of the GNU General Public License as published by the
  11 // Free Software Foundation; either version 3, or (at your option)
  12 // any later version.
  13 //
  14 // This library is distributed in the hope that it will be useful,
  15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 // GNU General Public License for more details.
  18 //
  19 // You should have received a copy of the GNU General Public License along
  20 // with this library; see the file COPYING3.  If not see
  21 // <http://www.gnu.org/licenses/>.
  22
  23 // 20.7.15 polymorphic function object wrapper
  24 #include <functional>
  25 #include <testsuite_hooks.h>
  26 #include <testsuite_tr1.h>
  27
  28 template<typename T>
  29   const T&
  30   as_const(T& t)
  31   { return t; }
  32
  33 // Check that f's target is a reference_wrapper bound to obj.
  34 template<typename Function, typename T>
  35   bool
  36   wraps(Function& f, T& obj)
  37   {
  38     using ref_wrapper_type = std::reference_wrapper<T>;
  39     auto* p = f.template target<ref_wrapper_type>();
  40     return std::addressof(p->get()) == std::addressof(obj);
  41   }
  42
  43 // Put reference_wrappers to member pointers
  44 void test08()
  45 {
  46   using std::function;
  47   using std::ref;
  48   using std::cref;
  49   using std::reference_wrapper;
  50   using __gnu_test::X;
  51
  52   int X::* X_bar = &X::bar;
  53   int (X::* X_foo)() = &X::foo;
  54   int (X::* X_foo_c)() const = &X::foo_c;
  55   int (X::* X_foo_v)() volatile = &X::foo_v;
  56   int (X::* X_foo_cv)() const volatile = &X::foo_cv;
  57
  58   X x;
  59   x.bar = 17;
  60
  61   function<int(X&)> frm(ref(X_bar));
  62   VERIFY( frm );
  63   VERIFY( frm(x) == 17 );
  64 #if __cpp_rtti
  65   VERIFY( typeid(ref(X_bar)) == frm.target_type() );
  66 #endif
  67   VERIFY( wraps(frm, X_bar) );
  68
  69   function<int(X&)> fr(ref(X_foo));
  70   VERIFY( fr );
  71   VERIFY( fr(x) == 1 );
  72 #if __cpp_rtti
  73   VERIFY( typeid(ref(X_foo)) == fr.target_type() );
  74 #endif
  75   VERIFY( wraps(fr, X_foo) );
  76
  77   function<int(const X&)> frc(ref(X_foo_c));
  78   VERIFY( frc );
  79   VERIFY( frc(x) == 2 );
  80 #if __cpp_rtti
  81   VERIFY( typeid(ref(X_foo_c)) == frc.target_type() );
  82 #endif
  83   VERIFY( wraps(frc, X_foo_c) );
  84
  85   function<int(volatile X&)> frv(ref(X_foo_v));
  86   VERIFY( frv );
  87   VERIFY( frv(x) == 3 );
  88 #if __cpp_rtti
  89   VERIFY( typeid(ref(X_foo_v)) == frv.target_type() );
  90 #endif
  91   VERIFY( wraps(frv, X_foo_v) );
  92
  93   function<int(const volatile X&)> frcv(ref(X_foo_cv));
  94   VERIFY( frcv );
  95   VERIFY( frcv(x) == 4 );
  96 #if __cpp_rtti
  97   VERIFY( typeid(ref(X_foo_cv)) == frcv.target_type() );
  98 #endif
  99   VERIFY( wraps(frcv, X_foo_cv) );
 100
 101   function<int(X*)> grm(ref(X_bar));
 102   VERIFY( grm );
 103   VERIFY( grm(&x) == 17 );
 104 #if __cpp_rtti
 105   VERIFY( typeid(ref(X_bar)) == grm.target_type() );
 106 #endif
 107   VERIFY( wraps(grm, X_bar) );
 108
 109   function<int(X*)> gr(ref(X_foo));
 110   VERIFY( gr );
 111   VERIFY( gr(&x) == 1 );
 112 #if __cpp_rtti
 113   VERIFY( typeid(ref(X_foo)) == gr.target_type() );
 114 #endif
 115   VERIFY( wraps(gr, X_foo) );
 116
 117   function<int(const X*)> grc(ref(X_foo_c));
 118   VERIFY( grc );
 119   VERIFY( grc(&x) == 2 );
 120 #if __cpp_rtti
 121   VERIFY( typeid(ref(X_foo_c)) == grc.target_type() );
 122 #endif
 123   VERIFY( wraps(grc, X_foo_c) );
 124
 125   function<int(volatile X*)> grv(ref(X_foo_v));
 126   VERIFY( grv );
 127   VERIFY( grv(&x) == 3 );
 128 #if __cpp_rtti
 129   VERIFY( typeid(ref(X_foo_v)) == grv.target_type() );
 130 #endif
 131   VERIFY( wraps(grv, X_foo_v) );
 132
 133   function<int(const volatile X*)> grcv(ref(X_foo_cv));
 134   VERIFY( grcv );
 135   VERIFY( grcv(&x) == 4 );
 136 #if __cpp_rtti
 137   VERIFY( typeid(ref(X_foo_cv)) == grcv.target_type() );
 138 #endif
 139   VERIFY( wraps(grcv, X_foo_cv) );
 140
 141   function<int(X&)> hrm(cref(X_bar));
 142   VERIFY( hrm );
 143   VERIFY( hrm(x) == 17 );
 144 #if __cpp_rtti
 145   VERIFY( typeid(cref(X_bar)) == hrm.target_type() );
 146 #endif
 147   VERIFY( wraps(hrm, as_const(X_bar)) );
 148
 149   function<int(X&)> hr(cref(X_foo));
 150   VERIFY( hr );
 151   VERIFY( hr(x) == 1 );
 152 #if __cpp_rtti
 153   VERIFY( typeid(cref(X_foo)) == hr.target_type() );
 154 #endif
 155   VERIFY( wraps(hr, as_const(X_foo)) );
 156
 157   function<int(const X&)> hrc(cref(X_foo_c));
 158   VERIFY( hrc );
 159   VERIFY( hrc(x) == 2 );
 160 #if __cpp_rtti
 161   VERIFY( typeid(cref(X_foo_c)) == hrc.target_type() );
 162 #endif
 163   VERIFY( wraps(hrc, as_const(X_foo_c)) );
 164
 165   function<int(volatile X&)> hrv(cref(X_foo_v));
 166   VERIFY( hrv );
 167   VERIFY( hrv(x) == 3 );
 168 #if __cpp_rtti
 169   VERIFY( typeid(cref(X_foo_v)) == hrv.target_type() );
 170 #endif
 171   VERIFY( wraps(hrv, as_const(X_foo_v)) );
 172
 173   function<int(const volatile X&)> hrcv(cref(X_foo_cv));
 174   VERIFY( hrcv );
 175   VERIFY( hrcv(x) == 4 );
 176 #if __cpp_rtti
 177   VERIFY( typeid(cref(X_foo_cv)) == hrcv.target_type() );
 178 #endif
 179   VERIFY( wraps(hrcv, as_const(X_foo_cv)) );
 180 }
 181
 182 int main()
 183 {
 184   test08();
 185   return 0;
 186 }