Commutative operator overloading + of 2 different objects
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04-10-2019 - |
Pergunta
I have 2 classes which represent a matrix:
1. RegularMatrix - O(n^2) representation
2. SparseMatrix - a matrix that is represented as linked list (without zeros).
lets say i have:
RegularMatrix a;
SparseMatrix b;
i want to be able to do:
a+b;
and also:
b+a;
so i'm overloading the + operator. My question is, since I want the addition to be commutative (a+b = b+a), do i need to implement 2 overloadings, one for each case?
RegularMatrix operator+(const RegualarMatrix &, const SparseMatrix &);
RegularMatrix operator+(const SparseMatrix & ,const RegualarMatrix &);
or is there a general form which the compiler decides by itself?
Thank you
Solução
Yes you need both versions. But you can forward the one to the other, if the operation really is commutative
RegularMatrix operator+(const SparseMatrix &a, const RegualarMatrix &b) {
return b + a;
}
Outras dicas
Both versions are required, just write after first overload:
RegularMatrix operator+(const SparseMatrix &a, const RegualarMatrix &b)
{
return operator+(b,a);
}
or simpler version:
RegularMatrix operator+(const SparseMatrix &a, const RegualarMatrix &b)
{
return b + a;
}
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