15.21. Equality Operators
The operators == (equal to) and != (not equal to) are called the equality operators.
EqualityExpression: RelationalExpression EqualityExpression == RelationalExpression EqualityExpression != RelationalExpression
The equality operators are syntactically left-associative (they group left-to-right).
However, this fact is essentially never useful. For example, a==b==c parses as (a==b)==c. The result type of a==b is always boolean, and c must therefore be of type boolean or a compile-time error occurs. Thus, a==b==c does not test to see whether a, b, and c are all equal.
The equality operators are commutative if the operand expressions have no side effects.
The equality operators are analogous to the relational ...
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