Strange C++ syntax method declaration

Question

I met this method declaration syntax in some C++ code :

formatted_log_t( log_level_t level, const wchar_t* msg ) : fmt(msg), level(level) {}

I don't understand how this is processed, the presence of ":", "fmt" & "level" before curly braces...

[Initialization lists](http://www.cprogramming.com/tutorial/initialization-lists-c++.html) — BlackDwarf, Oct 08 '15 at 09:08
Please have a look at : http://en.cppreference.com/w/cpp/language/initializer_list — CreativeMind, Oct 08 '15 at 09:09
I'm actually learning C/C++ from scratch since one month...all apologies :) — ZheFrench, Oct 08 '15 at 09:17

score 2 · Accepted Answer · answered Oct 08 '15 at 09:09

It's the C++ Initialization list. You can use it with class constructor example

class MaClasse
{
    int myInt;
    MaClasse(int value) : myInt(value) 
    {
    }
};

It is used to initialize member variable. It is faster to use the initialization list than use initialization in the body of the constructor

1 Answers1