Program Listing for File logger.h#

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#ifndef LOGGER_H
#define LOGGER_H

#include <iostream>
#include <sstream>
#include <cstdint>

enum class EVerbosityMode
{
    report_none = -1,
    report_errors = 0,
    report_all = 10,
};

class CLogControl
{
public:
    CLogControl();

    void SetVerbosityMode(EVerbosityMode eMode);

    EVerbosityMode GetVerbosityMode() const;

    void IncreaseIndent();
    void DecreaseIndent();
    void Log(const std::string& rssText, bool bError = false) const;

private:
    int32_t         m_iIndent = -1;
    mutable bool    m_bNewline = true;
    EVerbosityMode  m_eVerbosityMode = EVerbosityMode::report_errors;
};

extern CLogControl g_log_control;

class CLog : public std::ostream
{
public:
    template <typename... TArgs>
    CLog(TArgs... tArgs);

    ~CLog();

private:
    static void ComposeString([[maybe_unused]] std::stringstream& rss) {}

    template <typename TArg, typename... TArgs>
    static void ComposeString(std::stringstream& rss, TArg tArg, TArgs... tAdditionalArgs)
    {
        rss << tArg;
        ComposeString(rss, tAdditionalArgs...);
    }

    class CLogStringBuf : public std::stringbuf
    {
    protected:
        virtual int sync() override;
    };

    std::string     m_ssTask;
    CLogStringBuf   m_buffer;
};

template <typename... TArgs>
inline CLog::CLog(TArgs... tArgs) : std::ostream(&m_buffer)
{
    std::stringstream sstreamTaskDescr;
    ComposeString(sstreamTaskDescr, tArgs...);
    m_ssTask = sstreamTaskDescr.str();

    g_log_control.IncreaseIndent();
    if (!m_ssTask.empty())
        *this << "Entering: " << m_ssTask << std::endl;
}

#endif // !defined(LOGGER_H)
Program Listing for File logger.h#

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