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  ANSI Common Lisp   4 Types and Classes   4.4 Dictionary of Types and Classes

4.4.17 satisfies Type Specifier

Compound Type Specifier Kind:

Compound Type Specifier Syntax:
(satisfies predicate-name)

Compound Type Specifier Arguments:
predicate-name - a symbol.

Compound Type Specifier Description:
This denotes the set of all objects that satisfy the predicate predicate-name, which must be a symbol whose global function definition is a one-argument predicate. A name is required for predicate-name; lambda expressions are not allowed. For example, the type specifier (and integer (satisfies evenp)) denotes the set of all even integers. The form (typep x '(satisfies p)) is equivalent to (if (p x) t nil).

The argument is required. The symbol * can be the argument, but it denotes itself (the symbol *), and does not represent an unspecified value.

The symbol satisfies is not valid as a type specifier.

Allegro CL Implementation Details:

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