NGWS SDK Documentation  

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7.11.2 User-defined conditional logical operators

When the operands of && or || are of types that declare an applicable user-defined operator & or operator |, both of the following must be true, where T is the type in which the selected operator is declared:

A compile-time error occurs if either of these requirements is not satisfied. Otherwise, the && or || operation is evaluated by combining the user-defined operator true or operator false with the selected user-defined operator:

In either of these operations, the expression given by x is only evaluated once, and the expression given by y is either not evaluated or evaluated exactly once.

For an example of a type that implements operator true and operator false, see §11.3.2.