Deleted constructor acts strangely

[PSYCHAMERON]

I have the following class:

class Foo
{
public:
	int blablabla;

	Foo() = delete;
	Foo(int x) : blablabla(x) {};
	~Foo() {};
};

As you see, I have deleted the default constructor. But I noticed something strange:

Foo a1(); // works!
Foo a2 = Foo(); // compiler error! 

Why am I able to use the constructor that I deleted? And if the first statement is OK, what's wrong with the second one? I thought they are equivalent.

[mbozzi]

Consider the line
Foo a1();
This is a function declaration.

[lastchance]

Your first line isn't calling a constructor: it's declaring (but not defining) a function that returns a Foo.

See what happens if you remove the ().

No, I dislike it, too!

[againtry]

https://stackoverflow.com/questions/5513881/meaning-of-delete-after-function-declaration

[againtry]

https://www.stroustrup.com/C++11FAQ.html#default

[PSYCHAMERON]

I understood finally. Didn't know I could declare a function inside another function!