class draw
{
draw(circle i)
{
// draw a circle;
}
draw(circle i, circle j)
{
draw(i);
draw(j);
}
}
Can I call another overloaded constructor of the same class in C++ even if using template?
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1 Answer
No, in C++ you cannot have one constructor directly call another (well, at least not more than once). However, you can have each constructor call a third method that performs actual work.
class draw
{
draw(circle i)
{
do_draw(i);
}
draw(circle i, circle j)
{
do_draw(i);
do_draw(j);
}
void do_draw(circle c)
{
// draw a circle;
}
}
5 Comments
πάντα ῥεῖ
Well didn't c++11 (or at least c++14) introduced calling other constructors in the member initializer list?
Remy Lebeau
Yes, C++11 allows a constructor to call another constructor of the same class in the initializer list. It is called delegating constructors.
Greg Hewgill
That's right, but you can only call a delegated constructor once, not more than once as this question suggests.
πάντα ῥεῖ
@GregHewgill How the question suggests, that the constructor should be called more than once? Can you elaborate about an actually applicable solution regarding the current standard please?
Greg Hewgill
@πάνταῥεῖ: What? I'm not talking about any standard. I'm observing that the OP's two-argument constructor actually wants to draw two circles. If there is a single-argument constructor that draws one circle, you can't call that constructor twice to draw two different circles. One would have to create a third method as I have suggested in my answer.