port? -- r7rs Definition

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Kind

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type-predicate;

Extended by

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• port? (from vonuvoli);

Procedure signature

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Procedure variants:

• ((port) -> (true))
  • input: a value of type port;
  • output: a value of type true;
• ((any) -> (false))
  • input: a value of type any;
  • output: a value of type false;

Exports

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• scheme:base -- (scheme base);

Exports recursive

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• scheme -- (scheme);

Description

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(input-port? obj)
(output-port? obj)
(textual-port? obj)
(binary-port? obj)
(port? obj)

These procedures return #t if obj is an input port, output port, textual port, binary port, or any kind of port, respectively. Otherwise they return #f.

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The text herein was sourced and adapted as described in the "R7RS attribution of various text snippets" appendix.

Referenced-types

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• port;
• true;
• any;
• false;