operator() overloading - term does not evaluate to function

i dont think you can overload ")" and "(" only "[" and "]"

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Original post by Ilici
i dont think you can overload ")" and "(" only "[" and "]"

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I''m sorry, you''ll have to think twice on this one

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What compiler?

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Original post by Anonymous Poster
looks fine to me, should be int main() though, which compiler are you using?

Try a.operator()(2,4); see if that works

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This is weird - ''operator()'' doesn''t show up in Code Completion, only ''operator[]'' does and VS .NET won''t allow me to overload either ''operator[][](int n)'' (which, AFAIK, should be wrong) or ''operator[](int x, int y)''.

Forcing what AP suggested gives a linker error.

PS: I only threw together this example to show how operator overloading is failing in my case - the fact that main() has the wrong syntax (alas, Borland allows you to use ''void main()'' as well), is irrelevant

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quote:

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Original post by Crispy
This is weird - ''operator()'' doesn''t show up in Code Completion, only ''operator[]'' does and VS .NET won''t allow me to overload either ''operator[][](int n)'' (which, AFAIK, should be wrong) or ''operator[](int x, int y)''.

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Neither is valid. There is no such thing as operator[][] (the construct appears when operator[] returns something which has an operator[]), and operator[] can only take one parameter within the brackets.

Yes, I know ''[]'' can only take one parameter. In any case, how do go about overloading ''[]'' for a multidimensional array, eg the would-be ''[][]'' operator because I can''t see a way?

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looks like the compiler is confused and might think you''re actually modifying the term inside the array? did you try getting rid of the const overload?

just read the above answer..

[][] happens when [] returns an object wich has an OWN operator[]

class A1D {
  A& operator[](uint index) { return a; }
  A a;
}

class A2D {
  A1D& operator[](uint index) { return a; }
  A1D a;
}

A2D a;
A& a_item = a[1][2];

(and i know i forgot the ; at the end of the classes:D)

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If that''s not the help you''re after then you''re going to have to explain the problem better than what you have. - joanusdmentia

davepermen.net

It''s an inherent "fault" in MSVC. Read more about it here (scroll down "Design issues" and read the following couple of paragraphs). Didn''t find an official explanation to it, though...

davepermen: oh... must''ve missed that.

AP: no, I don''t need the STL here, sorry - my case is much more trivial and doesn''t require the capabilities provided by STL.

Anyway, for the time being, I settled from the primitive Get(x, y) and Set(x, y, v) solution. It''s weird that .NET should have this discrepency, though...

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class test
{
    int** array;
public:
    test()
    {
        array = new int*[3];
        for (int i = 0; i < 3; i++)
                array[i] = new int[2];
    }
    
    int* operator[](int dim)
    {
        return array[dim];
    }
};

test[0][0] = 3;

first test.op[](0) is called, then builtin int*[].
There aren''t any restrictions on return types, so this could possibly be a solution.


Wizza Wuzza?

See also http://www.parashift.com/c++-faq-lite/operator-overloading.html#faq-13.8

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Original post by Miserable
See also http://www.parashift.com/c++-faq-lite/operator-overloading.html#faq-13.8

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Yes, I already checked that link - it does everything the way I do, but doesn''t address the issue in MSVC. Somebody already compiled and ran this on mingw3.x...

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