| /* |
| * Copyright Andrey Semashev 2007 - 2015. |
| * Distributed under the Boost Software License, Version 1.0. |
| * (See accompanying file LICENSE_1_0.txt or copy at |
| * http://www.boost.org/LICENSE_1_0.txt) |
| */ |
| /*! |
| * \file formatters/wrap_formatter.hpp |
| * \author Andrey Semashev |
| * \date 24.11.2012 |
| * |
| * The header contains a formatter function wrapper that enables third-party functions to participate in formatting expressions. |
| */ |
| |
| #ifndef BOOST_LOG_EXPRESSIONS_FORMATTERS_WRAP_FORMATTER_HPP_INCLUDED_ |
| #define BOOST_LOG_EXPRESSIONS_FORMATTERS_WRAP_FORMATTER_HPP_INCLUDED_ |
| |
| #include <string> |
| #include <boost/move/core.hpp> |
| #include <boost/move/utility.hpp> |
| #include <boost/mpl/has_xxx.hpp> |
| #include <boost/phoenix/core/actor.hpp> |
| #include <boost/phoenix/core/terminal_fwd.hpp> |
| #include <boost/phoenix/core/is_nullary.hpp> |
| #include <boost/phoenix/core/environment.hpp> |
| #include <boost/type_traits/remove_cv.hpp> |
| #include <boost/type_traits/remove_reference.hpp> |
| #include <boost/fusion/sequence/intrinsic/at_c.hpp> |
| #include <boost/log/detail/config.hpp> |
| #include <boost/log/detail/custom_terminal_spec.hpp> |
| #include <boost/log/detail/function_traits.hpp> |
| #include <boost/log/utility/formatting_ostream.hpp> |
| #include <boost/log/detail/header.hpp> |
| |
| #ifdef BOOST_HAS_PRAGMA_ONCE |
| #pragma once |
| #endif |
| |
| namespace boost { |
| |
| BOOST_LOG_OPEN_NAMESPACE |
| |
| namespace expressions { |
| |
| namespace aux { |
| |
| //! Wrapped formatter stream output terminal |
| template< typename LeftT, typename FunT > |
| class wrapped_formatter_output_terminal |
| { |
| private: |
| //! Self type |
| typedef wrapped_formatter_output_terminal< LeftT, FunT > this_type; |
| |
| public: |
| //! Internal typedef for type categorization |
| typedef void _is_boost_log_terminal; |
| |
| //! Wrapped function type |
| typedef FunT function_type; |
| |
| //! Result type definition |
| template< typename > |
| struct result; |
| |
| template< typename ThisT, typename ContextT > |
| struct result< ThisT(ContextT) > |
| { |
| typedef typename remove_cv< typename remove_reference< ContextT >::type >::type context_type; |
| typedef typename phoenix::evaluator::impl< |
| typename LeftT::proto_base_expr&, |
| context_type, |
| phoenix::unused |
| >::result_type type; |
| }; |
| |
| private: |
| //! Left argument actor |
| LeftT m_left; |
| //! Wrapped function |
| function_type m_fun; |
| |
| public: |
| //! Initializing constructor |
| wrapped_formatter_output_terminal(LeftT const& left, function_type const& fun) : m_left(left), m_fun(fun) |
| { |
| } |
| //! Copy constructor |
| wrapped_formatter_output_terminal(wrapped_formatter_output_terminal const& that) : m_left(that.m_left), m_fun(that.m_fun) |
| { |
| } |
| |
| //! Invokation operator |
| template< typename ContextT > |
| typename result< this_type(ContextT const&) >::type operator() (ContextT const& ctx) |
| { |
| typedef typename result< this_type(ContextT const&) >::type result_type; |
| result_type strm = phoenix::eval(m_left, ctx); |
| m_fun(fusion::at_c< 0 >(phoenix::env(ctx).args()), strm); |
| return strm; |
| } |
| |
| //! Invokation operator |
| template< typename ContextT > |
| typename result< const this_type(ContextT const&) >::type operator() (ContextT const& ctx) const |
| { |
| typedef typename result< const this_type(ContextT const&) >::type result_type; |
| result_type strm = phoenix::eval(m_left, ctx); |
| m_fun(fusion::at_c< 0 >(phoenix::env(ctx).args()), strm); |
| return strm; |
| } |
| |
| BOOST_DELETED_FUNCTION(wrapped_formatter_output_terminal()) |
| }; |
| |
| BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(has_char_type, char_type, false) |
| |
| template< |
| typename FunT, |
| bool HasCharTypeV = has_char_type< FunT >::value, |
| bool HasSecondArgumentV = boost::log::aux::has_second_argument_type< FunT >::value, |
| bool HasArg2V = boost::log::aux::has_arg2_type< FunT >::value |
| > |
| struct default_char_type |
| { |
| // Use this char type if all detection fails |
| typedef char type; |
| }; |
| |
| template< typename FunT, bool HasSecondArgumentV, bool HasArg2V > |
| struct default_char_type< FunT, true, HasSecondArgumentV, HasArg2V > |
| { |
| typedef typename FunT::char_type type; |
| }; |
| |
| template< typename FunT, bool HasArg2V > |
| struct default_char_type< FunT, false, true, HasArg2V > |
| { |
| typedef typename remove_cv< typename remove_reference< typename FunT::second_argument_type >::type >::type argument_type; |
| typedef typename argument_type::char_type type; |
| }; |
| |
| template< typename FunT > |
| struct default_char_type< FunT, false, false, true > |
| { |
| typedef typename remove_cv< typename remove_reference< typename FunT::arg2_type >::type >::type argument_type; |
| typedef typename argument_type::char_type type; |
| }; |
| |
| } // namespace aux |
| |
| /*! |
| * Formatter function wrapper terminal. |
| */ |
| template< typename FunT, typename CharT > |
| class wrapped_formatter_terminal |
| { |
| public: |
| //! Internal typedef for type categorization |
| typedef void _is_boost_log_terminal; |
| |
| //! Character type |
| typedef CharT char_type; |
| //! String type |
| typedef std::basic_string< char_type > string_type; |
| //! Formatting stream type |
| typedef basic_formatting_ostream< char_type > stream_type; |
| //! Wrapped function type |
| typedef FunT function_type; |
| |
| //! Formatter result type |
| typedef string_type result_type; |
| |
| private: |
| //! Wrapped function |
| function_type m_fun; |
| |
| public: |
| //! Initializing construction |
| explicit wrapped_formatter_terminal(function_type const& fun) : m_fun(fun) |
| { |
| } |
| //! Copy constructor |
| wrapped_formatter_terminal(wrapped_formatter_terminal const& that) : m_fun(that.m_fun) |
| { |
| } |
| |
| //! Returns the wrapped function |
| function_type const& get_function() const |
| { |
| return m_fun; |
| } |
| |
| //! Invokation operator |
| template< typename ContextT > |
| result_type operator() (ContextT const& ctx) |
| { |
| string_type str; |
| stream_type strm(str); |
| m_fun(fusion::at_c< 0 >(phoenix::env(ctx).args()), strm); |
| strm.flush(); |
| return boost::move(str); |
| } |
| |
| //! Invokation operator |
| template< typename ContextT > |
| result_type operator() (ContextT const& ctx) const |
| { |
| string_type str; |
| stream_type strm(str); |
| m_fun(fusion::at_c< 0 >(phoenix::env(ctx).args()), strm); |
| strm.flush(); |
| return boost::move(str); |
| } |
| }; |
| |
| /*! |
| * Wrapped formatter function actor. |
| */ |
| template< typename FunT, typename CharT, template< typename > class ActorT = phoenix::actor > |
| class wrapped_formatter_actor : |
| public ActorT< wrapped_formatter_terminal< FunT, CharT > > |
| { |
| public: |
| //! Character type |
| typedef CharT char_type; |
| //! Wrapped function type |
| typedef FunT function_type; |
| //! Base terminal type |
| typedef wrapped_formatter_terminal< function_type, char_type > terminal_type; |
| |
| //! Base actor type |
| typedef ActorT< terminal_type > base_type; |
| |
| public: |
| //! Initializing constructor |
| explicit wrapped_formatter_actor(base_type const& act) : base_type(act) |
| { |
| } |
| |
| /*! |
| * \returns The wrapped function |
| */ |
| function_type const& get_function() const |
| { |
| return this->proto_expr_.child0.get_function(); |
| } |
| }; |
| |
| #ifndef BOOST_LOG_DOXYGEN_PASS |
| |
| #define BOOST_LOG_AUX_OVERLOAD(left_ref, right_ref)\ |
| template< typename LeftExprT, typename FunT, typename CharT >\ |
| BOOST_FORCEINLINE phoenix::actor< aux::wrapped_formatter_output_terminal< phoenix::actor< LeftExprT >, FunT > >\ |
| operator<< (phoenix::actor< LeftExprT > left_ref left, wrapped_formatter_actor< FunT, CharT > right_ref right)\ |
| {\ |
| typedef aux::wrapped_formatter_output_terminal< phoenix::actor< LeftExprT >, FunT > terminal_type;\ |
| phoenix::actor< terminal_type > actor = {{ terminal_type(left, right.get_function()) }};\ |
| return actor;\ |
| } |
| |
| #include <boost/log/detail/generate_overloads.hpp> |
| |
| #undef BOOST_LOG_AUX_OVERLOAD |
| |
| #endif // BOOST_LOG_DOXYGEN_PASS |
| |
| /*! |
| * The function wraps a function object in order it to be able to participate in formatting expressions. The wrapped |
| * function object must be compatible with the following signature: |
| * |
| * <pre> |
| * void (record_view const&, basic_formatting_ostream< CharT >&) |
| * </pre> |
| * |
| * where \c CharT is the character type of the formatting expression. |
| */ |
| template< typename FunT > |
| BOOST_FORCEINLINE wrapped_formatter_actor< FunT, typename aux::default_char_type< FunT >::type > wrap_formatter(FunT const& fun) |
| { |
| typedef wrapped_formatter_actor< FunT, typename aux::default_char_type< FunT >::type > actor_type; |
| typedef typename actor_type::terminal_type terminal_type; |
| typename actor_type::base_type act = {{ terminal_type(fun) }}; |
| return actor_type(act); |
| } |
| |
| /*! |
| * The function wraps a function object in order it to be able to participate in formatting expressions. The wrapped |
| * function object must be compatible with the following signature: |
| * |
| * <pre> |
| * void (record_view const&, basic_formatting_ostream< CharT >&) |
| * </pre> |
| * |
| * where \c CharT is the character type of the formatting expression. |
| */ |
| template< typename CharT, typename FunT > |
| BOOST_FORCEINLINE wrapped_formatter_actor< FunT, CharT > wrap_formatter(FunT const& fun) |
| { |
| typedef wrapped_formatter_actor< FunT, CharT > actor_type; |
| typedef typename actor_type::terminal_type terminal_type; |
| typename actor_type::base_type act = {{ terminal_type(fun) }}; |
| return actor_type(act); |
| } |
| |
| } // namespace expressions |
| |
| BOOST_LOG_CLOSE_NAMESPACE // namespace log |
| |
| #ifndef BOOST_LOG_DOXYGEN_PASS |
| |
| namespace phoenix { |
| |
| namespace result_of { |
| |
| template< typename LeftT, typename FunT > |
| struct is_nullary< custom_terminal< boost::log::expressions::aux::wrapped_formatter_output_terminal< LeftT, FunT > > > : |
| public mpl::false_ |
| { |
| }; |
| |
| template< typename FunT, typename CharT > |
| struct is_nullary< custom_terminal< boost::log::expressions::wrapped_formatter_terminal< FunT, CharT > > > : |
| public mpl::false_ |
| { |
| }; |
| |
| } // namespace result_of |
| |
| } // namespace phoenix |
| |
| #endif |
| |
| } // namespace boost |
| |
| #include <boost/log/detail/footer.hpp> |
| |
| #endif // BOOST_LOG_EXPRESSIONS_FORMATTERS_WRAP_FORMATTER_HPP_INCLUDED_ |