ceph/src/boost/boost/log/utility/functional/bind.hpp

   1 /*
   2  *          Copyright Andrey Semashev 2007 - 2015.
   3  * Distributed under the Boost Software License, Version 1.0.
   4  *    (See accompanying file LICENSE_1_0.txt or copy at
   5  *          http://www.boost.org/LICENSE_1_0.txt)
   6  */
   7 /*!
   8  * \file   bind.hpp
   9  * \author Andrey Semashev
  10  * \date   30.03.2008
  11  *
  12  * This header contains function object adapters.
  13  * This is a lightweight alternative to what Boost.Phoenix and Boost.Bind provides.
  14  */
  15
  16 #ifndef BOOST_LOG_UTILITY_FUNCTIONAL_BIND_HPP_INCLUDED_
  17 #define BOOST_LOG_UTILITY_FUNCTIONAL_BIND_HPP_INCLUDED_
  18
  19 #include <boost/type_traits/remove_cv.hpp>
  20 #include <boost/log/detail/config.hpp>
  21 #include <boost/log/detail/header.hpp>
  22
  23 #ifdef BOOST_HAS_PRAGMA_ONCE
  24 #pragma once
  25 #endif
  26
  27 namespace boost {
  28
  29 BOOST_LOG_OPEN_NAMESPACE
  30
  31 namespace aux {
  32
  33 template< typename T >
  34 struct make_arg_type
  35 {
  36     typedef T const& type;
  37 };
  38
  39 template< typename T >
  40 struct make_arg_type< T& >
  41 {
  42     typedef T& type;
  43 };
  44
  45 } // namespace aux
  46
  47 //! First argument binder
  48 template< typename FunT, typename FirstArgT >
  49 struct binder1st :
  50     private FunT
  51 {
  52     typedef typename FunT::result_type result_type;
  53
  54     binder1st(FunT const& fun, typename aux::make_arg_type< FirstArgT >::type arg) : FunT(fun), m_arg(arg) {}
  55
  56     result_type operator() () const
  57     {
  58         return FunT::operator()(m_arg);
  59     }
  60
  61     template< typename T0 >
  62     result_type operator() (T0 const& arg0) const
  63     {
  64         return FunT::operator()(m_arg, arg0);
  65     }
  66
  67     template< typename T0, typename T1 >
  68     result_type operator() (T0 const& arg0, T1 const& arg1) const
  69     {
  70         return FunT::operator()(m_arg, arg0, arg1);
  71     }
  72
  73 private:
  74     FirstArgT m_arg;
  75 };
  76
  77 //! First argument binder
  78 template< typename FunT, typename FirstArgT >
  79 struct binder1st< FunT&, FirstArgT >
  80 {
  81     typedef typename remove_cv< FunT >::type::result_type result_type;
  82
  83     binder1st(FunT& fun, typename aux::make_arg_type< FirstArgT >::type arg) : m_fun(fun), m_arg(arg) {}
  84
  85     result_type operator() () const
  86     {
  87         return m_fun(m_arg);
  88     }
  89
  90     template< typename T0 >
  91     result_type operator() (T0 const& arg0) const
  92     {
  93         return m_fun(m_arg, arg0);
  94     }
  95
  96     template< typename T0, typename T1 >
  97     result_type operator() (T0 const& arg0, T1 const& arg1) const
  98     {
  99         return m_fun(m_arg, arg0, arg1);
 100     }
 101
 102 private:
 103     FunT& m_fun;
 104     FirstArgT m_arg;
 105 };
 106
 107 template< typename FunT, typename FirstArgT >
 108 BOOST_FORCEINLINE binder1st< FunT, FirstArgT > bind1st(FunT fun, FirstArgT const& arg)
 109 {
 110     return binder1st< FunT, FirstArgT >(fun, arg);
 111 }
 112
 113 template< typename FunT, typename FirstArgT >
 114 BOOST_FORCEINLINE binder1st< FunT, FirstArgT > bind1st(FunT fun, FirstArgT& arg)
 115 {
 116     return binder1st< FunT, FirstArgT >(fun, arg);
 117 }
 118
 119 //! Second argument binder
 120 template< typename FunT, typename SecondArgT >
 121 struct binder2nd :
 122     private FunT
 123 {
 124     typedef typename FunT::result_type result_type;
 125
 126     binder2nd(FunT const& fun, typename aux::make_arg_type< SecondArgT >::type arg) : FunT(fun), m_arg(arg) {}
 127
 128     template< typename T >
 129     result_type operator() (T const& arg) const
 130     {
 131         return FunT::operator()(arg, m_arg);
 132     }
 133
 134     template< typename T0, typename T1 >
 135     result_type operator() (T0 const& arg0, T1 const& arg1) const
 136     {
 137         return FunT::operator()(arg0, m_arg, arg1);
 138     }
 139
 140 private:
 141     SecondArgT m_arg;
 142 };
 143
 144 //! Second argument binder
 145 template< typename FunT, typename SecondArgT >
 146 struct binder2nd< FunT&, SecondArgT >
 147 {
 148     typedef typename remove_cv< FunT >::type::result_type result_type;
 149
 150     binder2nd(FunT& fun, typename aux::make_arg_type< SecondArgT >::type arg) : m_fun(fun), m_arg(arg) {}
 151
 152     template< typename T >
 153     result_type operator() (T const& arg) const
 154     {
 155         return m_fun(arg, m_arg);
 156     }
 157
 158     template< typename T0, typename T1 >
 159     result_type operator() (T0 const& arg0, T1 const& arg1) const
 160     {
 161         return m_fun(arg0, m_arg, arg1);
 162     }
 163
 164 private:
 165     FunT& m_fun;
 166     SecondArgT m_arg;
 167 };
 168
 169 template< typename FunT, typename SecondArgT >
 170 BOOST_FORCEINLINE binder2nd< FunT, SecondArgT > bind2nd(FunT fun, SecondArgT const& arg)
 171 {
 172     return binder2nd< FunT, SecondArgT >(fun, arg);
 173 }
 174
 175 template< typename FunT, typename SecondArgT >
 176 BOOST_FORCEINLINE binder2nd< FunT, SecondArgT > bind2nd(FunT fun, SecondArgT& arg)
 177 {
 178     return binder2nd< FunT, SecondArgT >(fun, arg);
 179 }
 180
 181 //! Third argument binder
 182 template< typename FunT, typename ThirdArgT >
 183 struct binder3rd :
 184     private FunT
 185 {
 186     typedef typename FunT::result_type result_type;
 187
 188     binder3rd(FunT const& fun, typename aux::make_arg_type< ThirdArgT >::type arg) : FunT(fun), m_arg(arg) {}
 189
 190     template< typename T0, typename T1 >
 191     result_type operator() (T0 const& arg0, T1 const& arg1) const
 192     {
 193         return FunT::operator()(arg0, arg1, m_arg);
 194     }
 195
 196 private:
 197     ThirdArgT m_arg;
 198 };
 199
 200 //! Third argument binder
 201 template< typename FunT, typename ThirdArgT >
 202 struct binder3rd< FunT&, ThirdArgT >
 203 {
 204     typedef typename remove_cv< FunT >::type::result_type result_type;
 205
 206     binder3rd(FunT& fun, typename aux::make_arg_type< ThirdArgT >::type arg) : m_fun(fun), m_arg(arg) {}
 207
 208     template< typename T0, typename T1 >
 209     result_type operator() (T0 const& arg0, T1 const& arg1) const
 210     {
 211         return m_fun(arg0, arg1, m_arg);
 212     }
 213
 214 private:
 215     FunT& m_fun;
 216     ThirdArgT m_arg;
 217 };
 218
 219 template< typename FunT, typename ThirdArgT >
 220 BOOST_FORCEINLINE binder3rd< FunT, ThirdArgT > bind3rd(FunT fun, ThirdArgT const& arg)
 221 {
 222     return binder3rd< FunT, ThirdArgT >(fun, arg);
 223 }
 224
 225 template< typename FunT, typename ThirdArgT >
 226 BOOST_FORCEINLINE binder3rd< FunT, ThirdArgT > bind3rd(FunT fun, ThirdArgT& arg)
 227 {
 228     return binder3rd< FunT, ThirdArgT >(fun, arg);
 229 }
 230
 231 BOOST_LOG_CLOSE_NAMESPACE // namespace log
 232
 233 } // namespace boost
 234
 235 #include <boost/log/detail/footer.hpp>
 236
 237 #endif // BOOST_LOG_UTILITY_FUNCTIONAL_BIND_HPP_INCLUDED_