Function

class_getMethodImplementation

Returns the function pointer that would be called if a particular message were sent to an instance of a class.

Declaration

IMP class_getMethodImplementation(Class cls, SEL name);

Parameters

cls

The class you want to inspect.

name

A selector.

Return Value

The function pointer that would be called if [object name] were called with an instance of the class, or NULL if cls is Nil.

Discussion

class_getMethodImplementation may be faster than method_getImplementation(class_getInstanceMethod(cls, name)).

The function pointer returned may be a function internal to the runtime instead of an actual method implementation. For example, if instances of the class do not respond to the selector, the function pointer returned will be part of the runtime's message forwarding machinery.

See Also

Working with Classes

class_getName

Returns the name of a class.

class_getSuperclass

Returns the superclass of a class.

class_setSuperclass

Sets the superclass of a given class.

Deprecated
class_isMetaClass

Returns a Boolean value that indicates whether a class object is a metaclass.

class_getInstanceSize

Returns the size of instances of a class.

class_getInstanceVariable

Returns the Ivar for a specified instance variable of a given class.

class_getClassVariable

Returns the Ivar for a specified class variable of a given class.

class_addIvar

Adds a new instance variable to a class.

class_copyIvarList

Describes the instance variables declared by a class.

class_getIvarLayout

Returns a description of the Ivar layout for a given class.

class_setIvarLayout

Sets the Ivar layout for a given class.

class_getWeakIvarLayout

Returns a description of the layout of weak Ivars for a given class.

class_setWeakIvarLayout

Sets the layout for weak Ivars for a given class.

class_getProperty

Returns a property with a given name of a given class.

class_copyPropertyList

Describes the properties declared by a class.

class_addMethod

Adds a new method to a class with a given name and implementation.

class_getInstanceMethod

Returns a specified instance method for a given class.

class_getClassMethod

Returns a pointer to the data structure describing a given class method for a given class.

class_copyMethodList

Describes the instance methods implemented by a class.

class_replaceMethod

Replaces the implementation of a method for a given class.

class_getMethodImplementation_stret

Returns the function pointer that would be called if a particular message were sent to an instance of a class.

class_respondsToSelector

Returns a Boolean value that indicates whether instances of a class respond to a particular selector.

class_addProtocol

Adds a protocol to a class.

class_addProperty

Adds a property to a class.

class_replaceProperty

Replace a property of a class.

class_conformsToProtocol

Returns a Boolean value that indicates whether a class conforms to a given protocol.

class_copyProtocolList

Describes the protocols adopted by a class.

class_getVersion

Returns the version number of a class definition.

class_setVersion

Sets the version number of a class definition.

objc_getFutureClass

Used by CoreFoundation's toll-free bridging.

objc_setFutureClass

Used by CoreFoundation's toll-free bridging.