C++ initialization list example

gistfile1.txt

class Foo {
  public:
    void Foo(int p_x);
  private:
    int _x;
}

void Foo::Foo(int p_x) :
  _x(p_x)
{
  // do stuff
}

--- 

// alternative without initialization list
void Foo::Foo(int p_x) {
 this->_x = p_x;
}