flexible logger class

better_logger.cpp

//
//  main.cpp
//  test2
//  a slightly less horrible logging class
//
//  Created by Sean Wu on 12/17/18.
//  Copyright © 2018 Sean Wu. All rights reserved.
//

/* ######################################################################
 # includes and forward declarations
 ###################################################################### */

/* C++ includes */
#include <fstream>
#include <string>
#include <iostream>
#include <memory>
#include <unordered_map>


/* ######################################################################
 # class declaration
 ###################################################################### */

class logger {
public:
    
    /* ctor & dtor */
    logger() {
        std::cout << "logger born at " << this << std::endl;
    }
    
    ~logger(){
        close();
        std::cout << "logger dying at " << this << std::endl;
    }
    
    /* delete copy constructor/assignment operator, default move constructor/assignment operator */
    logger(const logger&) = delete;
    logger& operator=(const logger&) = delete;
    logger(logger&&) = default;
    logger& operator=(logger&&) = default;
    
    /* open & close logging streams */
    void open(const std::string& outfile, const std::string& name);
    void close();
    
    /* return reference to output stream */
    std::ofstream& get_out(const std::string& name){return logstreams.at(name);};
    
private:
    std::unordered_map<std::string, std::ofstream> logstreams;
    
};

/* open a logging stream */
inline void logger::open(const std::string& outfile, const std::string& name){
    logstreams.insert(std::make_pair(name,std::ofstream{outfile}));
};

/* close streams */
inline void logger::close(){
    for(auto& it : logstreams){
        it.second.close();
    }
};


/* main */
int main(int argc, const char * argv[]) {
    
    std::unique_ptr<logger> lptr = std::make_unique<logger>();
    
    lptr->open("/Users/slwu89/Desktop/test.txt","test");
    lptr->get_out("test") << "a line! \n";
    
    lptr->open("/Users/slwu89/Desktop/test1.txt","test1");
    lptr->get_out("test1") << "yet another line! \n";
    
    return 0;
}