CODEWITHSUNDEEP
c++visual-studio-2010visual-studiovisual-c++
user1541055
user1541055

Reputation: 119

Overloading operator by using STL utility.h

In my code i have encountered 37 errors of the same type c2678; binary 'operator' : no operator defined which takes a left-hand operand of type 'type' (or there is no acceptable conversion)

I am trying to remove the error by overloading the == operator, by including the STL "utility". http://msdn.microsoft.com/en-us/library/86s69hwc(v=vs.80).aspx http://en.wikibooks.org/wiki/C%2B%2B_Programming/Operators/Operator_Overloading

But still this doesnt works. Any help is appreciated.

Upvotes: 0

Views: 247

Answers (1)

Mike Seymour
Mike Seymour

Reputation: 254751

That header provides overloads of operator== for some standard types, but it won't magically overload it for your own types. If you want your types to be equality-comparable, then you'll have to overload the operator yourself, for example:

bool operator==(my_type const & a, my_type const & b) {
    return a.something == b.something
        && a.something_else == b.something_else;
}

// You'll probably want this as well
bool operator!=(my_type const & a, my_type const & b) {
    return !(a == b);
}

Upvotes: 1

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