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Logical Expressions

The binary | and & perform boolean ``or" and ``and", respectively. They require boolean operands and yield boolean results. They work in the usual fashion with equal-sized vector operands or one vector and one scalar. (See § 3.2.4, page .)

In addition to | and &, Glish provides the related || and && operators, taken from C. These are ``short-circuit'' operators; they evaluate their right-hand operand only when needed. Unlike most of the other operands, these do not perform element-by-element vector operations. Both operands should be numeric scalars, though presently vector values are allowed, in which case the first element of the vector is used.

The || operator evaluates its first operand and returns the result if the result resolves to true when considered as a boolean. Otherwise, it evaluates and returns its second operand. The && operator returns F if its first operand evaluates to false, otherwise it evaluates and returns its second operand.

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