libstdc++-v3/testsuite/20_util/function_objects/mem_fn/55463.cc

   1 // { dg-do compile { target c++11 } }
   2
   3 // Copyright (C) 2012-2019 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 // PR libstdc++/55463 Passing rvalue objects to std::mem_fn
  21
  22 #include <functional>
  23
  24 struct X
  25 {
  26   int& func();
  27   char& func_c() const;
  28   short& func_v() volatile;
  29   double& func_cv() const volatile;
  30
  31   int data;
  32 };
  33
  34 struct Y : X { };
  35
  36 using CX = const X;
  37 using CY = const Y;
  38
  39 using X_ptr = X*;
  40
  41 struct smart_ptr
  42 {
  43   X& operator*() const;
  44 };
  45
  46 std::reference_wrapper<X> ref();
  47 std::reference_wrapper<const X> cref();
  48 std::reference_wrapper<Y> yref();
  49
  50 void test01()
  51 {
  52   int& i1 __attribute__((unused)) = std::mem_fn( &X::func )( X() );
  53   int& i2 __attribute__((unused)) = std::mem_fn( &X::func )( Y() );
  54   int& i3 __attribute__((unused)) = std::mem_fn( &X::func )( ref() );
  55   int& i4 __attribute__((unused)) = std::mem_fn( &X::func )( yref() );
  56   int& i5 __attribute__((unused)) = std::mem_fn( &X::func )( X_ptr() );
  57   int& i6 __attribute__((unused)) = std::mem_fn( &X::func )( smart_ptr() );
  58
  59   char& c1 __attribute__((unused)) = std::mem_fn( &X::func_c )( X() );
  60   char& c2 __attribute__((unused)) = std::mem_fn( &X::func_c )( CX() );
  61   char& c3 __attribute__((unused)) = std::mem_fn( &X::func_c )( Y() );
  62   char& c4 __attribute__((unused)) = std::mem_fn( &X::func_c )( ref() );
  63   char& c5 __attribute__((unused)) = std::mem_fn( &X::func_c )( cref() );
  64   char& c6 __attribute__((unused)) = std::mem_fn( &X::func_c )( yref() );
  65   char& c7 __attribute__((unused)) = std::mem_fn( &X::func_c )( X_ptr() );
  66   char& c8 __attribute__((unused)) = std::mem_fn( &X::func_c )( smart_ptr() );
  67
  68   short& s1 __attribute__((unused)) = std::mem_fn( &X::func_v )( X() );
  69   short& s2 __attribute__((unused)) = std::mem_fn( &X::func_v )( Y() );
  70   short& s3 __attribute__((unused)) = std::mem_fn( &X::func_v )( ref() );
  71   short& s4 __attribute__((unused)) = std::mem_fn( &X::func_v )( yref() );
  72   short& s5 __attribute__((unused)) = std::mem_fn( &X::func_v )( X_ptr() );
  73   short& s6 __attribute__((unused)) = std::mem_fn( &X::func_v )( smart_ptr() );
  74
  75   double& d1 __attribute__((unused)) = std::mem_fn( &X::func_cv )( X() );
  76   double& d2 __attribute__((unused)) = std::mem_fn( &X::func_cv )( CX() );
  77   double& d3 __attribute__((unused)) = std::mem_fn( &X::func_cv )( Y() );
  78   double& d4 __attribute__((unused)) = std::mem_fn( &X::func_cv )( ref() );
  79   double& d5 __attribute__((unused)) = std::mem_fn( &X::func_cv )( cref() );
  80   double& d6 __attribute__((unused)) = std::mem_fn( &X::func_cv )( yref() );
  81   double& d7 __attribute__((unused)) = std::mem_fn( &X::func_cv )( X_ptr() );
  82   double& d8 __attribute__((unused))
  83     = std::mem_fn( &X::func_cv )( smart_ptr() );
  84
  85   // [expr.mptr.oper]
  86   // The result of a .* expression whose second operand is a pointer to a
  87   // data member is of the same value category (3.10) as its first operand.
  88   int&& rval __attribute__((unused)) = std::mem_fn( &X::data )( X() );
  89   const int&& crval __attribute__((unused)) = std::mem_fn( &X::data )( CX() );
  90   int&& yrval __attribute__((unused)) = std::mem_fn( &X::data )( Y() );
  91   const int&& ycrval __attribute__((unused)) = std::mem_fn( &X::data )( CY() );
  92
  93   int& val __attribute__((unused)) = std::mem_fn( &X::data )( ref() );
  94   const int& cval __attribute__((unused)) = std::mem_fn( &X::data )( cref() );
  95   int& yval __attribute__((unused)) = std::mem_fn( &X::data )( yref() );
  96
  97   int& pval __attribute__((unused)) = std::mem_fn( &X::data )( X_ptr() );
  98   int& sval __attribute__((unused)) = std::mem_fn( &X::data )( smart_ptr() );
  99 }