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- /*
- * 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)
- */
- #include <string>
- #include <iostream>
- #include <stdexcept>
- #include <boost/smart_ptr/shared_ptr.hpp>
- #include <boost/smart_ptr/make_shared_object.hpp>
- #include <boost/lexical_cast.hpp>
- #include <boost/phoenix.hpp>
- #include <boost/log/core.hpp>
- #include <boost/log/expressions.hpp>
- #include <boost/log/attributes/attribute_name.hpp>
- #include <boost/log/attributes/scoped_attribute.hpp>
- #include <boost/log/sources/logger.hpp>
- #include <boost/log/sources/record_ostream.hpp>
- #include <boost/log/utility/value_ref.hpp>
- #include <boost/log/utility/formatting_ostream.hpp>
- #include <boost/log/utility/manipulators/add_value.hpp>
- #include <boost/log/utility/setup/filter_parser.hpp>
- #include <boost/log/utility/setup/common_attributes.hpp>
- #include <boost/log/utility/setup/console.hpp>
- namespace logging = boost::log;
- namespace attrs = boost::log::attributes;
- namespace src = boost::log::sources;
- namespace expr = boost::log::expressions;
- namespace sinks = boost::log::sinks;
- namespace keywords = boost::log::keywords;
- //[ example_extension_filter_parser_point_definition
- struct point
- {
- float m_x, m_y;
- point() : m_x(0.0f), m_y(0.0f) {}
- point(float x, float y) : m_x(x), m_y(y) {}
- };
- bool operator== (point const& left, point const& right);
- bool operator!= (point const& left, point const& right);
- template< typename CharT, typename TraitsT >
- std::basic_ostream< CharT, TraitsT >& operator<< (std::basic_ostream< CharT, TraitsT >& strm, point const& p);
- template< typename CharT, typename TraitsT >
- std::basic_istream< CharT, TraitsT >& operator>> (std::basic_istream< CharT, TraitsT >& strm, point& p);
- //]
- const float epsilon = 0.0001f;
- bool operator== (point const& left, point const& right)
- {
- return (left.m_x - epsilon <= right.m_x && left.m_x + epsilon >= right.m_x) &&
- (left.m_y - epsilon <= right.m_y && left.m_y + epsilon >= right.m_y);
- }
- bool operator!= (point const& left, point const& right)
- {
- return !(left == right);
- }
- template< typename CharT, typename TraitsT >
- std::basic_ostream< CharT, TraitsT >& operator<< (std::basic_ostream< CharT, TraitsT >& strm, point const& p)
- {
- if (strm.good())
- strm << "(" << p.m_x << ", " << p.m_y << ")";
- return strm;
- }
- template< typename CharT, typename TraitsT >
- std::basic_istream< CharT, TraitsT >& operator>> (std::basic_istream< CharT, TraitsT >& strm, point& p)
- {
- if (strm.good())
- {
- CharT left_brace = static_cast< CharT >(0), comma = static_cast< CharT >(0), right_brace = static_cast< CharT >(0);
- strm.setf(std::ios_base::skipws);
- strm >> left_brace >> p.m_x >> comma >> p.m_y >> right_brace;
- if (left_brace != '(' || comma != ',' || right_brace != ')')
- strm.setstate(std::ios_base::failbit);
- }
- return strm;
- }
- #if 0
- //[ example_extension_simple_filter_factory
- void init_factories()
- {
- //<-
- logging::register_simple_formatter_factory< point, char >("Coordinates");
- //->
- logging::register_simple_filter_factory< point, char >("Coordinates");
- }
- //]
- #endif
- //[ example_extension_custom_filter_factory
- // Custom point filter factory
- class point_filter_factory :
- public logging::filter_factory< char >
- {
- public:
- logging::filter on_exists_test(logging::attribute_name const& name)
- {
- return expr::has_attr< point >(name);
- }
- logging::filter on_equality_relation(logging::attribute_name const& name, string_type const& arg)
- {
- return expr::attr< point >(name) == boost::lexical_cast< point >(arg);
- }
- logging::filter on_inequality_relation(logging::attribute_name const& name, string_type const& arg)
- {
- return expr::attr< point >(name) != boost::lexical_cast< point >(arg);
- }
- };
- void init_factories()
- {
- //<-
- logging::register_simple_formatter_factory< point, char >("Coordinates");
- //->
- logging::register_filter_factory("Coordinates", boost::make_shared< point_filter_factory >());
- }
- //]
- void init_logging()
- {
- init_factories();
- logging::add_console_log
- (
- std::clog,
- keywords::filter = "%Coordinates% = \"(10, 10)\"",
- keywords::format = "%TimeStamp% %Coordinates% %Message%"
- );
- logging::add_common_attributes();
- }
- int main(int, char*[])
- {
- init_logging();
- src::logger lg;
- // We have to use scoped attributes in order coordinates to be passed to filters
- {
- BOOST_LOG_SCOPED_LOGGER_TAG(lg, "Coordinates", point(10, 10));
- BOOST_LOG(lg) << "Hello, world with coordinates (10, 10)!";
- }
- {
- BOOST_LOG_SCOPED_LOGGER_TAG(lg, "Coordinates", point(20, 20));
- BOOST_LOG(lg) << "Hello, world with coordinates (20, 20)!"; // this message will be suppressed by filter
- }
- return 0;
- }
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