initialization list

[giuseppe.on.usenet]

class MyClass {
public:
MyClass(int a = 0) : var(a) { };
private:
int var;
};

int main() {
/* why can I use the initialization list here? */
MyClass myArray[2] = {1, 2};
}


Obviously int myArray[2] = {1, 2} would have been correct, but I don't
understand why MyClass myArray[2] is correct as well.

 

[Juha Nieminen]

Obviously int myArray[2] = {1, 2} would have been correct, but I don't
understand why MyClass myArray[2] is correct as well.

Why shouldn't it be correct? If you want to get an error, try making
the constructor explicit.

 

[Saeed Amrollahi]

class MyClass {
public:
    MyClass(int a = 0) : var(a) { };
private:
    int var;

};

int main() {
    /* why can I use the initialization list here? */
    MyClass myArray[2] = {1, 2};

}

Obviously int myArray[2] = {1, 2} would have been correct, but I don't
understand why MyClass myArray[2] is correct as well.

Hi

I believe it's OK.
you have a similar case like this:
MyClass c = 1; // convert int to MyClass.
// compiler implicitly call conversion constructor
Now, we have initializer list of integers. So for each initializer,
compiler calls the conversion constructor.

HTH,
-- Saeed Amrollahi

 

[Andrey Tarasevich]

class MyClass {
public:
MyClass(int a = 0) : var(a) { };
private:
int var;
};

int main() {
/* why can I use the initialization list here? */
MyClass myArray[2] = {1, 2};
}


Obviously int myArray[2] = {1, 2} would have been correct, but I don't
understand why MyClass myArray[2] is correct as well.

It is correct because the language specification says it is correct. Your

MyClass myArray[2] = {1, 2};

is interpreted as

MyClass myArray[2] = { MyClass(1), MyClass(2) };