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Added comments to the definition of IMP

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From-SVN: r57072
This commit is contained in:
Nicola Pero 2002-09-12 17:28:47 +00:00
parent d0029ebd92
commit 4c341bf5b7
1 changed files with 8 additions and 1 deletions
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9
libobjc/objc/objc.h
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@ -73,7 +73,14 @@ typedef struct objc_object {
/*
** Definition of method type. When retrieving the implementation of a
** method, this is type of the pointer returned
** method, this is type of the pointer returned. The idea of the
** definition of IMP is to represent a 'pointer to a general function
** taking an id, a SEL, followed by other unspecified arguments'. You
** must always cast an IMP to a pointer to a function taking the
** appropriate, specific types for that function, before calling it -
** to make sure the appropriate arguments are passed to it. The code
** generated by the compiler to perform method calls automatically
** does this cast inside method calls.
*/
typedef id (*IMP)(id, SEL, ...);