CODEWITHSUNDEEP
c++constructor
mechu
mechu

Reputation: 278

Calling default constructor

I have a problem with a default constructor in C++. It's a simple thing but can't see what's wrong with it.

I have a constructor with 3 optional parameters, with const values on initialization list:

data::data(int D = 1, int M = 1, int Y = 1583) : Day(D), Month(M), Year(Y)  
{  
    if (!CorrectDate()) throw "Wrong Date!";  
}

Why can I call it with one, two or three parameters and it works just fine but doesn't when I call it with no parameters?

data tommorrow();

Upvotes: 0

Views: 252

Answers (4)

fbafelipe
fbafelipe

Reputation: 4952

You are declaring a function which returns a data, you can do either:

data tommorow;

Without (), or you can do:

data tommorow = data();

Upvotes: 0

Adam Casey
Adam Casey

Reputation: 1620

Define it as 

data tomorrow;

data tomorrow(); is the same as defining a function called tomorrow which returns data

Upvotes: 2

Jon
Jon

Reputation: 437376

You are probably doing something like

data something();

which is not an initialization of a variable of type data called something, but the declaration of a function called something that returns data.

If this is the case, the correct would be:

data something;

Upvotes: 1

Michael Ratanapintha
Michael Ratanapintha

Reputation: 40567

data tomorrow(); is a declaration of a function that returns a data and takes no parameters. To create a data object with no explicit constructor arguments, just do data tomorrow; without the parentheses.

Upvotes: 3

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