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AndyGeers

C++ != and == operators

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Sorry for a really silly question, but does anybody know in C++ whether operator!= has to be specially defined as an operator if you already have an operator==, or if (lhs != rhs) implicitly does !(lhs.operator==(rhs)) ?

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You have to define it explicitly in C++ (other languages do it automatically though).

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You have to define it on its own, but you can use the other operator for that definition, i.e. if 'a != b' is the same as '!(a == b)'.

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You can however, just use operator == inside your operator !=:

class Foo
{
public:
bool operator==(const Foo& rhs) const
{
// Do comparison
}

bool operator!=(const Foo& rhs) const
{ return !(*this == rhs); }
};



EDIT: Bah, too slow [smile]

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