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Authors
- Andrew Kachites McCallum (
mccallum@gnu.ai.mit.edu)
-
Version: 26606
Date: 2008-06-08 11:38:33 +0100 (Sun, 08 Jun 2008)
Copyright: (C)
1994, 1995, 1996, 1998 Free Software Foundation, Inc.
- Declared in:
- Foundation/NSMethodSignature.h
Availability: OpenStep
Class encapsulating type
information for method arguments and return
value. It is used as a component of
NSInvocation
to implement message forwarding, such as within the
distributed objects framework. Instances can
be obtained from the
NSObject
method
[NSObject -methodSignatureForSelector:]
.
Basically, types are represented as
Objective-C @encode(...)
compatible strings, together with size
information. The arguments are numbered
starting from 0, including the implicit
arguments self (type
id, at position 0)
and _cmd (type
SEL, at position
1).
Instance Variables
Method summary
+ (
NSMethodSignature*)
signatureWithObjCTypes: (const char*)t;
Availability: OpenStep
Build a method signature directly from string
description of return type and argument types,
using the Objective-C @encode(...) type
codes.
- (
NSArgumentInfo)
argumentInfoAtIndex: (unsigned)index;
Availability: OPENSTEP 4.0.0 removed at MacOS-X 10.0.0
Returns full information on given argument. Indices
start at 0. Provide -1 to get info on return value.
- (unsigned)
frameLength;
Availability: OpenStep
Number of bytes that the full set of arguments
occupies on the stack, which is
platform(hardware)-dependent.
- (const char*)
getArgumentTypeAtIndex: (unsigned)index;
Availability: OpenStep
Returns Objective-C @encode(...)
compatible string. Arguments are numbered
starting from 0, including the implicit arguments
self (type
id, at position 0) and
_cmd (type
SEL, at position 1).
- (BOOL)
isOneway;
Availability: OpenStep
Pertains to distributed objects; method is
asynchronous when invoked and return should
not be waited for.
- (unsigned)
methodReturnLength;
Availability: OpenStep
Number of bytes that the return value occupies on
the stack, which is platform(hardware)-dependent.
- (const char*)
methodReturnType;
Availability: OpenStep
Returns Objective-C @encode(...)
compatible string. Arguments are numbered
starting from 0, including the implicit arguments
self (type
id, at position 0) and
_cmd (type
SEL, at position 1).
- (unsigned)
numberOfArguments;
Availability: OpenStep
Returns number of arguments to method, including
the implicit self and
_cmd.
Instance Variables for NSMethodSignature Class
@protected unsigned int _argFrameLength;
Availability: OpenStep
Warning the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically private, it is
intended for internal use within the package, and
you should not use the variable in other code.
@protected void* _info;
Availability: OpenStep
Warning the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically private, it is
intended for internal use within the package, and
you should not use the variable in other code.
@protected const char* _methodTypes;
Availability: OpenStep
Warning the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically private, it is
intended for internal use within the package, and
you should not use the variable in other code.
@protected unsigned int _numArgs;
Availability: OpenStep
Warning the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically private, it is
intended for internal use within the package, and
you should not use the variable in other code.
- Declared in:
- Foundation/NSMethodSignature.h
Availability: Base
Likely to be changed/moved/removed at 1.17.0
Declares a convenience method for getting the entire
array of raw type and size information.
Method summary
- (
NSArgumentInfo*)
methodInfo;
Availability: Base
Likely to be changed/moved/removed at 1.17.0
Convenience method for getting the entire array
of raw type and size information.
- (const char*)
methodType;
Availability: Base
Likely to be changed/moved/removed at 1.17.0
Returns a string containing all Objective-C
@encode(...) compatible type
information.
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