LogTrace.hpp

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#pragma once
 
#include <functional>
#include <iostream>
 
namespace iv
{
 
class LogTrace
{
public:
                        LogTrace();
                        ~LogTrace();
    
                        LogTrace( LogTrace const & ) = delete;
    LogTrace &          operator=( LogTrace const & ) = delete;
    
    static void         PrintTrace( std::ostream & );
    
    static unsigned     GetChangeCounter();
    
protected:
    virtual void        PrintTraceLine( std::ostream & ) = 0;
    
private:
    LogTrace * previous;
    LogTrace * next;
    static thread_local LogTrace *  first;
    static thread_local unsigned    change_counter;
};
 
 
class LambdaLogTrace : public LogTrace
{
public:
                        LambdaLogTrace( std::function< void( std::ostream & ) > const & f );
    
protected:
    virtual void        PrintTraceLine( std::ostream & ) override;
    
private:
    std::function< void( std::ostream & ) > _lambda;
};
 
}