91 lines
2.8 KiB
C++
91 lines
2.8 KiB
C++
/**
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* @file logger.h
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* Header for Base class for 'loggers' that write text messages to log files
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* (see \ref textlogs and class \link Cantera::Logger Logger\endlink).
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*/
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#ifndef CT_LOGGER_H
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#define CT_LOGGER_H
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#include "ct_defs.h"
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#include <iostream>
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namespace Cantera
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{
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///
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/// Base class for 'loggers' that write text messages to log files.
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///
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/// This class is used to direct log messages to application- or
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/// environment-specific output. The default is to simply print
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/// the messages to the standard output stream or standard error
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/// stream, but classes may be derived from Logger that implement
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/// other output options. This is important when Cantera is used
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/// in applications that do not display the standard output, such
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/// as MATLAB. The Cantera MATLAB interface derives a class from
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/// Logger that implements these methods with MATLAB-specific
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/// procedures, insuring that the messages will be passed through
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/// to the user. It would also be possible to derive a class that
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/// displayed the messages in a pop-up window, or redirected them
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/// to a file, etc.
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///
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/// To install a logger, call function setLogger (global.h / misc.cpp).
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///
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/// See the files Cantera/python/src/pylogger.h and
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/// Cantera/matlab/cantera/private/mllogger.h for examples of
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/// deriving logger classes.
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/// @ingroup textlogs
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///
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class Logger
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{
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public:
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//! Constructor - empty
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Logger() {}
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//! Destructor - empty
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virtual ~Logger() {}
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//! Write a log message.
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/*!
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* The default behavior is to write to
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* the standard output. Note that no end-of-line character is
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* appended to the message, and so if one is desired it must
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* be included in the string.
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*
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* @param msg String message to be written to cout
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*/
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virtual void write(const std::string& msg) {
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std::cout << msg;
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}
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//! Write an end of line character and flush output.
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/*!
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* Some systems treat endl and \n differently. The endl
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* statement causes a flushing of stdout to the screen.
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*/
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virtual void writeendl() {
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std::cout << std::endl;
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}
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//! Write an error message and quit.
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/*!
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* The default behavior is
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* to write to the standard error stream, and then call
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* exit(). Note that no end-of-line character is appended to
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* the message, and so if one is desired it must be included
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* in the string. Note that this default behavior will
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* terminate the application Cantera is invoked from (MATLAB,
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* Excel, etc.) If this is not desired, then derive a class
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* and reimplement this method.
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*
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* @param msg Error message to be written to cerr.
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*/
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virtual void error(const std::string& msg) {
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std::cerr << msg << std::endl;
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exit(EXIT_FAILURE);
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}
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};
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}
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#endif
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