ofstream.cpp

#include <iostream>
#include <fstream>
#include <string>

int main(const int argc, char* const argv[]) {
    std::streambuf* buf;

    if (argc >= 2) {
        std::cout << "Got two or more args" << std::endl;
        // OK
        std::ofstream ofs;
        ofs.open(std::string(argv[1]));
        // Not OK
        // std::ofstream ofs(std::string(argv[1]));
        buf = ofs.rdbuf();
    }
    else {
        std::cout << "Using std::cout" << std::endl;
        buf = std::cout.rdbuf();
    }

    std::ostream os(buf);
    os << "Hello, World!" << std::endl;

    return 0;
}