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jjrscott/JJRSIfKind.h

Created June 18, 2018 14:02
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An ObjC equivalent of Swift's `if let`
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JJRSIfKind.h
//
// JJRSIfKind.h
// JJRSFoundation
//
// Copyright © 2018 John Scott ( https://jjrscott.com )
//
// This file is MIT licensed.
// Usage: ifkind (existing variable, required class name) { ... }
#define ifkind(anExistingVariable, aClass) __ifkind(anExistingVariable, aClass, __ifkind_temp(__COUNTER__))
#define __ifkind(anExistingVariable, aClass, tempVariable) \
id tempVariable = [anExistingVariable isKindOfClass:[aClass class]]?anExistingVariable:nil; \
for (aClass * const anExistingVariable = tempVariable,*__ifkind_test = tempVariable; tempVariable && __ifkind_test; __ifkind_test=nil)
#define __ifkind_temp_imp( aCount ) __ifkind_ ## aCount ## __
#define __ifkind_temp( aCount ) __ifkind_temp_imp( aCount )
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