ceph/src/boost/boost/log/expressions/predicates/begins_with.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   begins_with.hpp
   9  * \author Andrey Semashev
  10  * \date   02.09.2012
  11  *
  12  * The header contains implementation of a \c begins_with predicate in template expressions.
  13  */
  14
  15 #ifndef BOOST_LOG_EXPRESSIONS_PREDICATES_BEGINS_WITH_HPP_INCLUDED_
  16 #define BOOST_LOG_EXPRESSIONS_PREDICATES_BEGINS_WITH_HPP_INCLUDED_
  17
  18 #include <boost/phoenix/core/actor.hpp>
  19 #include <boost/log/detail/config.hpp>
  20 #include <boost/log/detail/embedded_string_type.hpp>
  21 #include <boost/log/detail/unary_function_terminal.hpp>
  22 #include <boost/log/detail/attribute_predicate.hpp>
  23 #include <boost/log/attributes/attribute_name.hpp>
  24 #include <boost/log/attributes/fallback_policy.hpp>
  25 #include <boost/log/expressions/attr_fwd.hpp>
  26 #include <boost/log/expressions/keyword_fwd.hpp>
  27 #include <boost/log/utility/functional/begins_with.hpp>
  28 #include <boost/log/detail/header.hpp>
  29
  30 #ifdef BOOST_HAS_PRAGMA_ONCE
  31 #pragma once
  32 #endif
  33
  34 namespace boost {
  35
  36 BOOST_LOG_OPEN_NAMESPACE
  37
  38 namespace expressions {
  39
  40 /*!
  41  * The predicate checks if the attribute value begins with a substring. The attribute value is assumed to be of a string type.
  42  */
  43 #if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
  44
  45 template< typename T, typename SubstringT, typename FallbackPolicyT = fallback_to_none >
  46 using attribute_begins_with = aux::attribute_predicate< T, SubstringT, begins_with_fun, FallbackPolicyT >;
  47
  48 #else // !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
  49
  50 template< typename T, typename SubstringT, typename FallbackPolicyT = fallback_to_none >
  51 class attribute_begins_with :
  52     public aux::attribute_predicate< T, SubstringT, begins_with_fun, FallbackPolicyT >
  53 {
  54     typedef aux::attribute_predicate< T, SubstringT, begins_with_fun, FallbackPolicyT > base_type;
  55
  56 public:
  57     /*!
  58      * Initializing constructor
  59      *
  60      * \param name Attribute name
  61      * \param substring The expected attribute value beginning
  62      */
  63     attribute_begins_with(attribute_name const& name, SubstringT const& substring) : base_type(name, substring)
  64     {
  65     }
  66
  67     /*!
  68      * Initializing constructor
  69      *
  70      * \param name Attribute name
  71      * \param substring The expected attribute value beginning
  72      * \param arg Additional parameter for the fallback policy
  73      */
  74     template< typename U >
  75     attribute_begins_with(attribute_name const& name, SubstringT const& substring, U const& arg) : base_type(name, substring, arg)
  76     {
  77     }
  78 };
  79
  80 #endif // !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
  81
  82 /*!
  83  * The function generates a terminal node in a template expression. The node will check if the attribute value,
  84  * which is assumed to be a string, begins with the specified substring.
  85  */
  86 template< typename T, typename FallbackPolicyT, typename TagT, template< typename > class ActorT, typename SubstringT >
  87 BOOST_FORCEINLINE ActorT< aux::unary_function_terminal< attribute_begins_with< T, typename boost::log::aux::make_embedded_string_type< SubstringT >::type, FallbackPolicyT > > >
  88 begins_with(attribute_actor< T, FallbackPolicyT, TagT, ActorT > const& attr, SubstringT const& substring)
  89 {
  90     typedef aux::unary_function_terminal< attribute_begins_with< T, typename boost::log::aux::make_embedded_string_type< SubstringT >::type, FallbackPolicyT > > terminal_type;
  91     ActorT< terminal_type > act = {{ terminal_type(attr.get_name(), substring, attr.get_fallback_policy()) }};
  92     return act;
  93 }
  94
  95 /*!
  96  * The function generates a terminal node in a template expression. The node will check if the attribute value,
  97  * which is assumed to be a string, begins with the specified substring.
  98  */
  99 template< typename DescriptorT, template< typename > class ActorT, typename SubstringT >
 100 BOOST_FORCEINLINE ActorT< aux::unary_function_terminal< attribute_begins_with< typename DescriptorT::value_type, typename boost::log::aux::make_embedded_string_type< SubstringT >::type > > >
 101 begins_with(attribute_keyword< DescriptorT, ActorT > const&, SubstringT const& substring)
 102 {
 103     typedef aux::unary_function_terminal< attribute_begins_with< typename DescriptorT::value_type, typename boost::log::aux::make_embedded_string_type< SubstringT >::type > > terminal_type;
 104     ActorT< terminal_type > act = {{ terminal_type(DescriptorT::get_name(), substring) }};
 105     return act;
 106 }
 107
 108 /*!
 109  * The function generates a terminal node in a template expression. The node will check if the attribute value,
 110  * which is assumed to be a string, begins with the specified substring.
 111  */
 112 template< typename T, typename SubstringT >
 113 BOOST_FORCEINLINE phoenix::actor< aux::unary_function_terminal< attribute_begins_with< T, typename boost::log::aux::make_embedded_string_type< SubstringT >::type > > >
 114 begins_with(attribute_name const& name, SubstringT const& substring)
 115 {
 116     typedef aux::unary_function_terminal< attribute_begins_with< T, typename boost::log::aux::make_embedded_string_type< SubstringT >::type > > terminal_type;
 117     phoenix::actor< terminal_type > act = {{ terminal_type(name, substring) }};
 118     return act;
 119 }
 120
 121 } // namespace expressions
 122
 123 BOOST_LOG_CLOSE_NAMESPACE // namespace log
 124
 125 } // namespace boost
 126
 127 #include <boost/log/detail/footer.hpp>
 128
 129 #endif // BOOST_LOG_EXPRESSIONS_PREDICATES_BEGINS_WITH_HPP_INCLUDED_