crow

Utility library

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Logging

Crow Library by Ross Smith

#include "crow/log.hpp"
namespace Crow;

Logging

class SetLog {
    SetLog() noexcept;
    explicit SetLog(FILE* stream) noexcept;
    ~SetLog() noexcept;
};
inline void set_log(FILE* stream) noexcept;

Temporarily or permanently change the global output stream used for logging. Logging goes to standard error by default. Setting the log stream to a null pointer will disable all logging.

template <typename... Args>
    void logx(const Args&... args);

Write a log message. This writes all its arguments in a space delimited list, formatted using the argument type’s str() function if it has one, otherwise using its output operator. The output will be prefixed with a UTC timestamp.

If the log output is going to a terminal, the text is printed in a random colour, based on a hash of the thread ID, so that log lines from different threads can be easily distinguished. Log lines from different threads are printed atomically; text from different threads will not be fragmented.

#define CROW_LOG(...)

This does the same thing as the logx() function, but the macro version adds the call site’s file name, function name, and line number after the timestamp. The file and function names are unqualified.