The ==, !=, <, >, <=, >=, is and as operators are called the relational and type-testing operators.

relational-expression:

shift-expression

relational-expression < shift-expression

relational-expression > shift-expression

relational-expression <= shift-expression

relational-expression >= shift-expression

relational-expression is type

relational-expression as type

equality-expression:

relational-expression

equality-expression == relational-expression

equality-expression != relational-expression

The is operator is described in §14.9.10 and the as operator is described in §14.9.11.

The ==, !=, <, >, <= and >= operators are comparison operators. For an operation of the form x op y, where

op is a comparison operator, overload resolution (§14.2.4) is applied to select a specific operator

implementation. The operands are converted to the parameter types of the selected operator, and the type of

the result is the return type of the operator. If both operands of an equality-expression have the null type

(§11.2.7) (and hence the null value as well), then overload resolution is not performed and the expression

evaluates to a constant value of true or false according to whether the operator is == or !=.

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