Concept EqualityComparableConceptA type that can be equality compared.
A type that can be equality compared.
Detailed Description
Remarks
Expects instances of type T to be comparable via operator== and operator!=. Comparison operators must return boolean convertible values. operator== must be an equivalence relation.
Examples
Valid expressions:
a == b; a != b;
Invariants:
 (a == a) (reflexivity)
 (a == b) => (b == a) (symmetry)
 (a == b) &&(b == c) => (a == c) (transitivity)
See Also
Member Function Overview

bool T::operator!=(T const & other) const;
Operator to compare for inequality. 
bool T::operator==(T const & other) const;
Operator to compare for equality.
Member Functions Detail
bool T::operator!=(T const & other) const;
Operator to compare for inequality.
The inequality operator can be implemented as a member or as a global function.
Usually, the inequality operator is implemented as !operator==(a, b).
See Also
bool T::operator==(T const & other) const;
Operator to compare for equality.
The equality operator can be implemented as a member or as a global function.
Usually, there is an implementation of operator==() for custom data types and then operator!=() uses operator==().