LTP GCOV extension - code coverage report
Current view: directory - usr/include/c++/4.3/backward - binders.h
Test: lcov.info
Date: 2008-08-14 Instrumented lines: 7
Code covered: 100.0 % Executed lines: 7

       1                 : // Functor implementations -*- C++ -*-
       2                 : 
       3                 : // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007
       4                 : // Free Software Foundation, Inc.
       5                 : //
       6                 : // This file is part of the GNU ISO C++ Library.  This library is free
       7                 : // software; you can redistribute it and/or modify it under the
       8                 : // terms of the GNU General Public License as published by the
       9                 : // Free Software Foundation; either version 2, or (at your option)
      10                 : // any later version.
      11                 : 
      12                 : // This library is distributed in the hope that it will be useful,
      13                 : // but WITHOUT ANY WARRANTY; without even the implied warranty of
      14                 : // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      15                 : // GNU General Public License for more details.
      16                 : 
      17                 : // You should have received a copy of the GNU General Public License along
      18                 : // with this library; see the file COPYING.  If not, write to the Free
      19                 : // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
      20                 : // USA.
      21                 : 
      22                 : // As a special exception, you may use this file as part of a free software
      23                 : // library without restriction.  Specifically, if other files instantiate
      24                 : // templates or use macros or inline functions from this file, or you compile
      25                 : // this file and link it with other files to produce an executable, this
      26                 : // file does not by itself cause the resulting executable to be covered by
      27                 : // the GNU General Public License.  This exception does not however
      28                 : // invalidate any other reasons why the executable file might be covered by
      29                 : // the GNU General Public License.
      30                 : 
      31                 : /*
      32                 :  *
      33                 :  * Copyright (c) 1994
      34                 :  * Hewlett-Packard Company
      35                 :  *
      36                 :  * Permission to use, copy, modify, distribute and sell this software
      37                 :  * and its documentation for any purpose is hereby granted without fee,
      38                 :  * provided that the above copyright notice appear in all copies and
      39                 :  * that both that copyright notice and this permission notice appear
      40                 :  * in supporting documentation.  Hewlett-Packard Company makes no
      41                 :  * representations about the suitability of this software for any
      42                 :  * purpose.  It is provided "as is" without express or implied warranty.
      43                 :  *
      44                 :  *
      45                 :  * Copyright (c) 1996-1998
      46                 :  * Silicon Graphics Computer Systems, Inc.
      47                 :  *
      48                 :  * Permission to use, copy, modify, distribute and sell this software
      49                 :  * and its documentation for any purpose is hereby granted without fee,
      50                 :  * provided that the above copyright notice appear in all copies and
      51                 :  * that both that copyright notice and this permission notice appear
      52                 :  * in supporting documentation.  Silicon Graphics makes no
      53                 :  * representations about the suitability of this software for any
      54                 :  * purpose.  It is provided "as is" without express or implied warranty.
      55                 :  */
      56                 : 
      57                 : /** @file backward/binders.h
      58                 :  *  This is an internal header file, included by other library headers.
      59                 :  *  You should not attempt to use it directly.
      60                 :  */
      61                 : 
      62                 : #ifndef _GLIBCXX_BINDERS_H
      63                 : #define _GLIBCXX_BINDERS_H 1
      64                 : 
      65                 : _GLIBCXX_BEGIN_NAMESPACE(std)
      66                 : 
      67                 :   // 20.3.6 binders
      68                 :   /** @defgroup s20_3_6_binder Binder Classes
      69                 :    *  Binders turn functions/functors with two arguments into functors with
      70                 :    *  a single argument, storing an argument to be applied later.  For
      71                 :    *  example, a variable @c B of type @c binder1st is constructed from a
      72                 :    *  functor @c f and an argument @c x.  Later, B's @c operator() is called
      73                 :    *  with a single argument @c y.  The return value is the value of @c f(x,y).
      74                 :    *  @c B can be "called" with various arguments (y1, y2, ...) and will in
      75                 :    *  turn call @c f(x,y1), @c f(x,y2), ...
      76                 :    *
      77                 :    *  The function @c bind1st is provided to save some typing.  It takes the
      78                 :    *  function and an argument as parameters, and returns an instance of
      79                 :    *  @c binder1st.
      80                 :    *
      81                 :    *  The type @c binder2nd and its creator function @c bind2nd do the same
      82                 :    *  thing, but the stored argument is passed as the second parameter instead
      83                 :    *  of the first, e.g., @c bind2nd(std::minus<float>,1.3) will create a
      84                 :    *  functor whose @c operator() accepts a floating-point number, subtracts
      85                 :    *  1.3 from it, and returns the result.  (If @c bind1st had been used,
      86                 :    *  the functor would perform "1.3 - x" instead.
      87                 :    *
      88                 :    *  Creator-wrapper functions like @c bind1st are intended to be used in
      89                 :    *  calling algorithms.  Their return values will be temporary objects.
      90                 :    *  (The goal is to not require you to type names like
      91                 :    *  @c std::binder1st<std::plus<int>> for declaring a variable to hold the
      92                 :    *  return value from @c bind1st(std::plus<int>,5).
      93                 :    *
      94                 :    *  These become more useful when combined with the composition functions.
      95                 :    *
      96                 :    *  @{
      97                 :    */
      98                 :   /// One of the @link s20_3_6_binder binder functors@endlink.
      99                 :   template<typename _Operation>
     100                 :     class binder1st
     101                 :     : public unary_function<typename _Operation::second_argument_type,
     102                 :                             typename _Operation::result_type>
     103              16 :     {
     104                 :     protected:
     105                 :       _Operation op;
     106                 :       typename _Operation::first_argument_type value;
     107                 : 
     108                 :     public:
     109                 :       binder1st(const _Operation& __x,
     110              19 :                 const typename _Operation::first_argument_type& __y)
     111              19 :       : op(__x), value(__y) { }
     112                 : 
     113                 :       typename _Operation::result_type
     114              70 :       operator()(const typename _Operation::second_argument_type& __x) const
     115              70 :       { return op(value, __x); }
     116                 : 
     117                 :       // _GLIBCXX_RESOLVE_LIB_DEFECTS
     118                 :       // 109.  Missing binders for non-const sequence elements
     119                 :       typename _Operation::result_type
     120                 :       operator()(typename _Operation::second_argument_type& __x) const
     121                 :       { return op(value, __x); }
     122                 :     } _GLIBCXX_DEPRECATED_ATTR;
     123                 : 
     124                 :   /// One of the @link s20_3_6_binder binder functors@endlink.
     125                 :   template<typename _Operation, typename _Tp>
     126                 :     inline binder1st<_Operation>
     127              19 :     bind1st(const _Operation& __fn, const _Tp& __x)
     128                 :     {
     129                 :       typedef typename _Operation::first_argument_type _Arg1_type;
     130              19 :       return binder1st<_Operation>(__fn, _Arg1_type(__x));
     131                 :     }
     132                 : 
     133                 :   /// One of the @link s20_3_6_binder binder functors@endlink.
     134                 :   template<typename _Operation>
     135                 :     class binder2nd
     136                 :     : public unary_function<typename _Operation::first_argument_type,
     137                 :                             typename _Operation::result_type>
     138                 :     {
     139                 :     protected:
     140                 :       _Operation op;
     141                 :       typename _Operation::second_argument_type value;
     142                 : 
     143                 :     public:
     144                 :       binder2nd(const _Operation& __x,
     145                 :                 const typename _Operation::second_argument_type& __y)
     146                 :       : op(__x), value(__y) { }
     147                 : 
     148                 :       typename _Operation::result_type
     149                 :       operator()(const typename _Operation::first_argument_type& __x) const
     150                 :       { return op(__x, value); }
     151                 : 
     152                 :       // _GLIBCXX_RESOLVE_LIB_DEFECTS
     153                 :       // 109.  Missing binders for non-const sequence elements
     154                 :       typename _Operation::result_type
     155                 :       operator()(typename _Operation::first_argument_type& __x) const
     156                 :       { return op(__x, value); }
     157                 :     } _GLIBCXX_DEPRECATED_ATTR;
     158                 : 
     159                 :   /// One of the @link s20_3_6_binder binder functors@endlink.
     160                 :   template<typename _Operation, typename _Tp>
     161                 :     inline binder2nd<_Operation>
     162                 :     bind2nd(const _Operation& __fn, const _Tp& __x)
     163                 :     {
     164                 :       typedef typename _Operation::second_argument_type _Arg2_type;
     165                 :       return binder2nd<_Operation>(__fn, _Arg2_type(__x));
     166                 :     } 
     167                 :   /** @}  */
     168                 : 
     169                 : _GLIBCXX_END_NAMESPACE
     170                 : 
     171                 : #endif /* _GLIBCXX_BINDERS_H */

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