CODEWITHSUNDEEP
c++data-structures
user848704
user848704

Reputation:

error: no match for 'operator=='

I'm having some trouble implementing a search function for a Linked List using base code from this data structures book. This is the error I'm getting:

llist.h: In member function 'void LList<E>::search(const E&, bool&) [with E = Int]':
Llistmain.cpp:31:1:   instantiated from here
llist.h:119:3: error: no match for 'operator==' in '((LList<Int>*)this)->LList<Int>::curr->Link<Int>::element == value'

And here is the implementation of my search member function:

void search(const E& value, bool& found) {
    if (curr->element == value)
        found = true;
    else if (curr != NULL) {
        curr = curr->next;
        search(value, found);
    }
    else found = false;
}

Why am I getting an error about the == operator? Both curr->element and value are of type Int. Should I be checking for equality differently?

Upvotes: 1

Views: 130

Answers (2)

Dietmar K&#252;hl
Dietmar K&#252;hl

Reputation: 153840

Does your type Int have a comparision operator? If it has, does it take both of its arguments as const? In particular, if you comparision operator is a member it is easy to forget to make it a const member:

bool Int::operator== (Int const& other) const {
   ...
}

Upvotes: 1

Seth Carnegie
Seth Carnegie

Reputation: 75130

According to the error, element is not an int but a Link<Int>. You need to get the Int out of the Link and turn it into something that has an operator== (note that Int is not int).

Upvotes: 0

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