Addition of default argument on redeclaration makes this constructor a default constructor

Question

It says the addition of default argument on redeclaration makes this constructor a default constructor.

I did some research on it but I just don't understand what I need to do to fix this issue.

struct Transaction{
    int type;
    int amount;
    int to_from_type;
    Transaction(int, int, int);
};

Transaction :: Transaction(int type=0, int amount=0, int etc=0)
{
    this->type=type;
    this->amount=amount;
    this->to_from_type=etc;
}




 Transaction :: Transaction(int type=0, int amount=0, int etc=0) //I am getting an error at this code and I cannot fix it.

    {
        this->type=type;
        this->amount=amount;
        this->to_from_type=etc;
    }

I am not an expert in C++ and would love to get some help with my code.

Answer 1

XCode is using a combination of CLang and Apple LLVM to compile your C++ code. Clang enforces a few additional checks which includes your case. What happened here is you defined a constructor to accept 3 params but your implementation can be called without any, meaning, your implemented one is actually carrying the same method signature (method name and param list) as the implicit default constructor and the one with 3 params (the one defined inside the struct) is getting left out in the eyes of your compiler. The fix is easy:

struct Transaction{
    int type;
    int amount;
    int to_from_type;
    Transaction(int=0, int=0, int=0);
};

Transaction :: Transaction(int type, int amount, int etc)
{
    this->type=type;
    this->amount=amount;
    this->to_from_type=etc;
}