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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 fun_ref.hpp | |
9 | * \author Andrey Semashev | |
10 | * \date 30.03.2008 | |
11 | * | |
12 | * This header contains function object reference adapter. The adapter stores a reference to external | |
13 | * function object and forwards all calls to the referred function. | |
14 | */ | |
15 | ||
16 | #ifndef BOOST_LOG_UTILITY_FUNCTIONAL_FUN_REF_HPP_INCLUDED_ | |
17 | #define BOOST_LOG_UTILITY_FUNCTIONAL_FUN_REF_HPP_INCLUDED_ | |
18 | ||
19 | #include <boost/log/detail/config.hpp> | |
20 | #include <boost/log/detail/header.hpp> | |
21 | ||
22 | #ifdef BOOST_HAS_PRAGMA_ONCE | |
23 | #pragma once | |
24 | #endif | |
25 | ||
26 | namespace boost { | |
27 | ||
28 | BOOST_LOG_OPEN_NAMESPACE | |
29 | ||
30 | //! Reference wrapper for function objects | |
31 | template< typename FunT > | |
32 | struct function_reference_wrapper | |
33 | { | |
34 | typedef typename FunT::result_type result_type; | |
35 | ||
36 | explicit function_reference_wrapper(FunT& fun) : m_Fun(fun) {} | |
37 | ||
38 | result_type operator() () const | |
39 | { | |
40 | return m_Fun(); | |
41 | } | |
42 | ||
43 | #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) | |
44 | template< typename... ArgsT > | |
45 | result_type operator() (ArgsT const&... args) const | |
46 | { | |
47 | return m_Fun(args...); | |
48 | } | |
49 | #else | |
50 | template< typename T > | |
51 | result_type operator() (T const& arg) const | |
52 | { | |
53 | return m_Fun(arg); | |
54 | } | |
55 | ||
56 | template< typename T1, typename T2 > | |
57 | result_type operator() (T1 const& arg1, T2 const& arg2) const | |
58 | { | |
59 | return m_Fun(arg1, arg2); | |
60 | } | |
61 | #endif | |
62 | ||
63 | private: | |
64 | FunT& m_Fun; | |
65 | }; | |
66 | ||
67 | template< typename FunT > | |
68 | BOOST_FORCEINLINE function_reference_wrapper< FunT > fun_ref(FunT& fun) | |
69 | { | |
70 | return function_reference_wrapper< FunT >(fun); | |
71 | } | |
72 | ||
73 | BOOST_LOG_CLOSE_NAMESPACE // namespace log | |
74 | ||
75 | } // namespace boost | |
76 | ||
77 | #include <boost/log/detail/footer.hpp> | |
78 | ||
79 | #endif // BOOST_LOG_UTILITY_FUNCTIONAL_FUN_REF_HPP_INCLUDED_ |