type/filedesc - Maple Programming Help

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type/filedesc

check for an object of type filedesc

 

Calling Sequence

Parameters

Description

Examples

Calling Sequence

type(e, 'filedesc')

Parameters

e

-

any expression

Description

• 

The call type(e, 'filedesc') checks whether the expression e may be a valid file descriptor. File descriptors are expressions of types integer, string, or symbol.

• 

Note that this type check is a surface type check only. It does not verify that the expression e actually refers to an open file.

Examples

typebook,'filedesc'

true

(1)

type12,'filedesc'

true

(2)

type12x,'filedesc'

false

(3)

type12*x,'filedesc'

true

(4)

typebook1,'filedesc'

false

(5)

See Also

file

iolib

type

type/integer

type/string

type/symbol