Default values for array arguments

Question

Just playing around a little with C++. What I really want to do is to be able to setup a function with default values defined for an array or pointer argument. To keep thing

Answer 1

One simple way to do this is via plain old function overloading. For example, below simulates the default parameter value for format parameter which is char* type:

static string to_string(time_point time)
{
    return to_string(time, "%Y-%m-%d-%H-%M-%S");
}

static string to_string(time_point time, const char* format)
{
    time_t tt = system_clock::to_time_t(time);

    char str[1024];
    if (std::strftime(str, sizeof(str), format, std::localtime(&tt)))
        return string(str);
    else return string();
}