Question about constructors

What does the following code do?

Code:

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class Foo
{};

int main()
{
        Foo();
}

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Is a Foo object created and then immediately destroyed? I've seen this used in a few examples and I don't understand what the purpose of Foo() is here.

When you declare a function Foo(); inside the class Foo, it will be a constructor...
in that case it does nothing... but for instance, if you had a class like this

Code:

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Class Foo{
public:
int x, int y;
Foo(int a, int b){ x = a; y = b; }
};

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when you declared an object with a and b it would call the constructor...

Code:

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Foo FooObj(1, 2);

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and then FooObj.x would be 1 and FooObj.y would be 2... something like this :P...

I was more referring to the fact that main calls a constructor without binding the created object to a variable.

Can you give us a real example, with Foo defined?

What's wrong with the example above? It compiles without warnings, and I have no idea what it does.

In particular, if Foo is a class, what does this do when used outside the class body:

Code:

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Foo();

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Quote:

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Originally Posted by Memloop

What's wrong with the example above? It compiles without warnings, and I have no idea what it does.

In particular, if Foo is a class, what does this do when used outside the class body:

Code:

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Foo();

---

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Calls the constructor, creates a temporary object, then discards the temporary.