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1.3.3 Special argument and result conversion

Since the LispWorks Objective-C interface is an extension of the FLI, most conversion of arguments and results is handled as specified in the LispWorks Foreign Language Interface User Guide and Reference Manual . There are a few exceptions to make it easier to invoke methods with certain commonly used Objective-C classes and structures as shown in the Special argument and result conversion for invoke. See the specification of invoke for full details.

Special argument and result conversion for invoke

Type

Special argument behavior

Special result behavior

NSRect

Allows a vector to be passed.

Converts to a vector.

NSPoint

Allows a vector to be passed.

Converts to a vector.

NSSize

Allows a vector to be passed.

Converts to a vector.

NSRange

Allow a cons to be passed.

Converts to a cons.

BOOL

Allow nil or t to be passed.

None. See Invoking a method that returns a boolean.

id

Depending on the Objective-C class, allows automatic conversion of strings and arrays.

None. See Invoking a method that returns a string or array.

Class

Allows a string to be passed.

None.

char *

Allows a string to be passed.

Converts to a string.


LispWorks Objective-C and Cocoa Interface User Guide and Reference Manual - 4 Apr 2005

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