libstdc++-v3/testsuite/tr1/3_function_objects/mem_fn.cc

   1 // 2005-01-26 Douglas Gregor <dgregor@cs.indiana.edu>
   2 //
   3 // Copyright (C) 2005, 2009 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 // 3.5 function template mem_fn
  21 #include <tr1/functional>
  22 #include <testsuite_hooks.h>
  23 #include <testsuite_tr1.h>
  24
  25 struct X { int bar; };
  26
  27 struct Y : X { };
  28
  29 template<typename T>
  30 struct dumb_ptr
  31 {
  32   dumb_ptr(T* p) : p(p) {}
  33
  34   T& operator*() const { return *p; }
  35
  36  private:
  37   T* p;
  38 };
  39
  40 // Test mem_fn with a data member
  41 void test01(int r = 0)
  42 {
  43   using std::tr1::mem_fn;
  44
  45   X x;
  46   Y y;
  47   const X& xc = x;
  48   const Y& yc = y;
  49   X* xp = &x;
  50   Y* yp =&y;
  51   const X* xpc = xp;
  52   const Y* ypc = yp;
  53   dumb_ptr<X> xd(xp);
  54   dumb_ptr<Y> yd(yp);
  55   const dumb_ptr<X>& xdc = xd;
  56   const dumb_ptr<Y>& ydc = yd;
  57
  58   int& bx = mem_fn(&X::bar)(x);
  59   const int& bxc = mem_fn(&X::bar)(xc);
  60   int& bxp = mem_fn(&X::bar)(xp);
  61   const int& bxpc = mem_fn(&X::bar)(xpc);
  62   const int& bxd = mem_fn(&X::bar)(xd);
  63   const int& bxdc = mem_fn(&X::bar)(xdc);
  64
  65   int& by = mem_fn(&X::bar)(y);
  66   const int& byc = mem_fn(&X::bar)(yc);
  67   int& byp = mem_fn(&X::bar)(yp);
  68   const int& bypc = mem_fn(&X::bar)(ypc);
  69   const int& byd = mem_fn(&X::bar)(yd);
  70   const int& bydc = mem_fn(&X::bar)(ydc);
  71
  72   // Avoid unused variable warnings.
  73   r = bx + bxc + bxp + bxpc + bxd + bxdc + by + byc + byp + bypc + byd + bydc;
  74 }
  75
  76 int main()
  77 {
  78   test01();
  79   return 0;
  80 }