CODEWITHSUNDEEP
c++
liegebeest
liegebeest

Reputation: 39

Redefinition of constructor with inheritance

Why in the underlying example keeps the compiler complaining about a redefinition for the B constructor. If i remove the {} it complains they need to be there. How is this done correctly? I want to implement the constructor of B in the CPP file and not inline.

#include <vector>
#include <sstream>
#include <iostream>

using namespace std;

class A
{
    public:
        A();
        ~A();
};

class B : public A
{
    public:
        B() : A() {};
        ~B();
};

A::A()
{
    cout << "A construct!";
}

B::B()
{
    cout << "B construct!";
    cout << "B construct!";
    cout << "B construct!";
    cout << "B construct!";
    cout << "B construct!";
    cout << "B construct!";
    cout << "B construct!";
    cout << "B construct!";
    cout << "B construct!";
    cout << "B construct!";
}

int main()
{
    return 0;
}

Upvotes: 0

Views: 2110

Answers (2)

sergio
sergio

Reputation: 69027

You have already defined B constructor in the class definition:

class B : public A
{
  public:
    B() : A() {};
    ~B();
};

So, when you define it again outside of the class definition:

B::B()
{
    cout << "B construct!";

you get the error; if the correct constructor is the last one, replace your class definition with this one:

class B : public A
{
  public:
    B();
    ~B();
};

If you want to specify the base class constructor in B constructor definition, you can do:

B::B()
    : A()
{
    cout << "B construct!";

Upvotes: 4

littleadv
littleadv

Reputation: 20272

Remove : A() {}, that's the body of your constructor, not just {}. Add the initializer list to the body B::B() you have later on.

Upvotes: 1

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