library/cpp/logger/element.h


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#pragma once
 
#include "priority.h" 
 
#include <util/stream/tempbuf.h> 
 
class TLog; 
 
/* 
 * better do not use directly 
 */ 
class TLogElement: public TTempBufOutput {
public: 
    TLogElement(const TLog* parent); 
    TLogElement(const TLog* parent, ELogPriority priority);

    TLogElement(TLogElement&&) noexcept = default; 
    TLogElement& operator=(TLogElement&&) noexcept = default; 

    ~TLogElement() override; 
 
    template <class T> 
    inline TLogElement& operator<<(const T& t) { 
        static_cast<IOutputStream&>(*this) << t;
 
        return *this; 
    } 
 
    /* 
         * for pretty usage: logger << TLOG_ERROR << "Error description"; 
         */ 
    inline TLogElement& operator<<(ELogPriority priority) {
        Flush(); 
        Priority_ = priority; 
        return *this; 
    } 
 
    ELogPriority Priority() const noexcept {
        return Priority_; 
    } 

protected: 
    void DoFlush() override; 
 
protected: 
    const TLog* Parent_; 
    ELogPriority Priority_;
};