include/o3tl/functional.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  *
   4  * Copyright (c) 1994
   5  * Hewlett-Packard Company
   6  *
   7  * Copyright (c) 1996-1998
   8  * Silicon Graphics Computer Systems, Inc.
   9  *
  10  * Copyright (c) 1997
  11  * Moscow Center for SPARC Technology
  12  *
  13  * Copyright (c) 1999
  14  * Boris Fomitchev
  15  *
  16  * This material is provided "as is", with absolutely no warranty expressed
  17  * or implied. Any use is at your own risk.
  18  *
  19  * Permission to use or copy this software for any purpose is hereby granted
  20  * without fee, provided the above notices are retained on all copies.
  21  * Permission to modify the code and to distribute modified code is granted,
  22  * provided the above notices are retained, and a notice that the code was
  23  * modified is included with the above copyright notice.
  24  *
  25  */
  26
  27 /*
  28  * Lifted and paraphrased from STLport - with additions from Fridrich
  29  * Strba and Thorsten Behrens
  30  */
  31
  32 #ifndef INCLUDED_O3TL_FUNCTIONAL_HXX
  33 #define INCLUDED_O3TL_FUNCTIONAL_HXX
  34
  35 namespace o3tl
  36 {
  37 /// Select first value of a pair
  38 template<typename P>
  39 struct select1st
  40 {
  41     typedef P argument_type;
  42     typedef typename P::first_type result_type;
  43     const result_type& operator()( const argument_type& cp ) const {
  44         return cp.first;
  45     }
  46 };
  47
  48 /// Select second value of a pair
  49 template<typename P>
  50 struct select2nd
  51 {
  52     typedef P argument_type;
  53     typedef typename P::second_type result_type;
  54     const result_type& operator()( const argument_type& cp ) const {
  55         return cp.second;
  56     }
  57 };
  58
  59 }   // namespace o3tl
  60
  61 #endif
  62
  63 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */