LCOV - lcov.info - /usr/include/c++/4.3/backward/binders.h

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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