123 lines
3.3 KiB
C++
123 lines
3.3 KiB
C++
/*
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* Copyright Andrey Semashev 2007 - 2015.
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*/
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#include <cstddef>
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#include <iostream>
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#include <boost/log/core.hpp>
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#include <boost/log/expressions.hpp>
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#include <boost/log/attributes.hpp>
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#include <boost/log/utility/value_ref.hpp>
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namespace logging = boost::log;
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namespace expr = boost::log::expressions;
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namespace sinks = boost::log::sinks;
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namespace attrs = boost::log::attributes;
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namespace keywords = boost::log::keywords;
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// We define our own severity levels
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enum severity_level
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{
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normal,
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notification,
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warning,
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error,
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critical
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};
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// The operator puts a human-friendly representation of the severity level to the stream
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std::ostream& operator<< (std::ostream& strm, severity_level level)
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{
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static const char* strings[] =
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{
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"normal",
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"notification",
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"warning",
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"error",
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"critical"
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};
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if (static_cast< std::size_t >(level) < sizeof(strings) / sizeof(*strings))
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strm << strings[level];
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else
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strm << static_cast< int >(level);
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return strm;
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}
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//[ example_core_record_visitation_extraction
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//=enum severity_level { ... };
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//=std::ostream& operator<< (std::ostream& strm, severity_level level);
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struct print_visitor
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{
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typedef void result_type;
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result_type operator() (severity_level level) const
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{
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std::cout << level << std::endl;
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};
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};
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// Prints severity level through visitation API
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void print_severity_visitation(logging::record const& rec)
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{
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logging::visit< severity_level >("Severity", rec, print_visitor());
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}
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// Prints severity level through extraction API
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void print_severity_extraction(logging::record const& rec)
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{
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logging::value_ref< severity_level > level = logging::extract< severity_level >("Severity", rec);
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std::cout << level << std::endl;
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}
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//]
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//[ example_core_record_attr_value_lookup
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// Prints severity level by searching the attribute values
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void print_severity_lookup(logging::record const& rec)
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{
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logging::attribute_value_set const& values = rec.attribute_values();
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logging::attribute_value_set::const_iterator it = values.find("Severity");
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if (it != values.end())
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{
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logging::attribute_value const& value = it->second;
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// A single attribute value can also be visited or extracted
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std::cout << value.extract< severity_level >() << std::endl;
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}
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}
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//]
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//[ example_core_record_subscript
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BOOST_LOG_ATTRIBUTE_KEYWORD(severity, "Severity", severity_level)
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// Prints severity level by using the subscript operator
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void print_severity_subscript(logging::record const& rec)
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{
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// Use the attribute keyword to communicate the name and type of the value
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logging::value_ref< severity_level, tag::severity > level = rec[severity];
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std::cout << level << std::endl;
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}
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//]
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int main(int, char*[])
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{
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logging::attribute_set attrs;
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attrs.insert("Severity", attrs::make_constant(notification));
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logging::record rec = logging::core::get()->open_record(attrs);
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if (rec)
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{
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print_severity_visitation(rec);
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print_severity_extraction(rec);
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print_severity_lookup(rec);
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print_severity_subscript(rec);
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}
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return 0;
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}
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