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 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 2, 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 COPYING.  If not, write to the Free
  18 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  19 // USA.
  20
  21 // 3.5 function template mem_fn
  22 #include <tr1/functional>
  23 #include <testsuite_hooks.h>
  24 #include <testsuite_tr1.h>
  25
  26 struct X { int bar; };
  27
  28 struct Y : X { };
  29
  30 template<typename T>
  31 struct dumb_ptr
  32 {
  33   dumb_ptr(T* p) : p(p) {}
  34
  35   T& operator*() const { return *p; }
  36
  37  private:
  38   T* p;
  39 };
  40
  41 // Test mem_fn with a data member
  42 void test01(int r = 0)
  43 {
  44   using std::tr1::mem_fn;
  45
  46   X x;
  47   Y y;
  48   const X& xc = x;
  49   const Y& yc = y;
  50   X* xp = &x;
  51   Y* yp =&y;
  52   const X* xpc = xp;
  53   const Y* ypc = yp;
  54   dumb_ptr<X> xd(xp);
  55   dumb_ptr<Y> yd(yp);
  56   const dumb_ptr<X>& xdc = xd;
  57   const dumb_ptr<Y>& ydc = yd;
  58
  59   int& bx = mem_fn(&X::bar)(x);
  60   const int& bxc = mem_fn(&X::bar)(xc);
  61   int& bxp = mem_fn(&X::bar)(xp);
  62   const int& bxpc = mem_fn(&X::bar)(xpc);
  63   const int& bxd = mem_fn(&X::bar)(xd);
  64   const int& bxdc = mem_fn(&X::bar)(xdc);
  65
  66   int& by = mem_fn(&X::bar)(y);
  67   const int& byc = mem_fn(&X::bar)(yc);
  68   int& byp = mem_fn(&X::bar)(yp);
  69   const int& bypc = mem_fn(&X::bar)(ypc);
  70   const int& byd = mem_fn(&X::bar)(yd);
  71   const int& bydc = mem_fn(&X::bar)(ydc);
  72
  73   // Avoid unused variable warnings.
  74   r = bx + bxc + bxp + bxpc + bxd + bxdc + by + byc + byp + bypc + byd + bydc;
  75 }
  76
  77 int main()
  78 {
  79   test01();
  80   return 0;
  81 }