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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* tracer.h
*
* Sun Dec 29 18:04:28 CET 2019
* Copyright 2019 Daniel Pastor
* marlborometal@gmail.com
****************************************************************************/
/*
* This file is part of DrumGizmo.
*
* DrumGizmo is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* DrumGizmo is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with DrumGizmo; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#pragma once
#include <fstream>
#include <memory>
#include <stdexcept>
//! This file contains the trace tool for developmnent purposes. The trace tool
//! just prints messages to a given file.
namespace tracer
{
//! This class takes care of the output stream where trace messages will be
//! printed. Its methods are not supposed to be called by anyone else than the
//! "trace" functions.
class tracer_manager
{
public:
//! Returns a reference to the file stream.
static std::ofstream& get()
{
if(nullptr==outfile.get())
{
//TODO: This should not be fixed, but either depend on the OS or be able to
//specified somehow.
outfile.reset(new std::ofstream("/tmp/drumgizmo.trace",
std::ios::app));
}
if(nullptr==outfile.get())
{
throw std::runtime_error("the tracer file could not be initialized");
}
return *(outfile.get());
}
private:
//! Single output file. Will be initialized to nullptr when the program
//! starts and freed when the program ends.
static std::unique_ptr<std::ofstream> outfile;
};
//! Trace function without parameters, used on the last call to the variadic
//! templace "trace".
void trace();
//! Variadic trace function. Obtains a reference to the file stream and prints
//! its arguments there.
template<typename T, typename... Args>
void trace(T val, Args... args)
{
tracer_manager::get()<<val;
trace(args...);
}
}//End of tracer namespace.
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