C++ define 3 arguments but using just 2

Question

I would like to use different number of arguments.

class A {
    public:
          A(int a, int b);
};

A::A(int a, int b) {
    // constructor code
}

int main() { 
    A a(5); // I use only 1 argument and the second one I let default ?
}

use like `A(int a, int b =5);`. any default value you can give at declaration time. — Himanshu, Jan 12 '15 at 12:17
Two options: default argument (see duplicate question) or overloading. — leemes, Jan 12 '15 at 12:18

score 2 · Accepted Answer · answered Jan 12 '15 at 12:18

2

Constructors are (a bit special) functions - regular default parameter syntax applies.

class A {
    public:
          A(int a, int b = default_value);
};

A::A(int a, int b) {
    // constructor code
}

int main() { 
    A a(5);
}

answered Jan 12 '15 at 12:18

Bartek Banachewicz

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C++ define 3 arguments but using just 2

1 Answers1