What is the difference between object and object() in C++

Question

class A {
  public:
    A() { cout << "Constructor\n"; }  // (1) default constructor
};

A obj;                                // (2) instantiating obj

A obj();                              // (3)

What is the difference between instantiating obj and obj()? obj calls the default constructor (1) mentioned above. Which constructor will obj() call?

@Thank you all for the links.. – Subi Suresh Feb 09 '13 at 07:53 — Subi Suresh, Feb 09 '13 at 07:53

score 1 · Answer 1 · answered Feb 09 '13 at 07:47

1

A obj(); declares a function called obj which takes no arguments and which returns an A. It does not declare an A object at all.

As A obj(); does not declare an A object, it does not result in any constructor call.

answered Feb 09 '13 at 07:47

Mankarse

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score 0 · Answer 2 · answered Feb 09 '13 at 07:48

0

The second one is declared as a function. the name of the function is obj. It takes no arguments. It returns the object of type A.

answered Feb 09 '13 at 07:48

Apurv

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What is the difference between object and object() in C++

2 Answers2