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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_MAC_SCOPED_OBJC_CLASS_SWIZZLER_H_
#define BASE_MAC_SCOPED_OBJC_CLASS_SWIZZLER_H_
#import <objc/runtime.h>
#include "base/base_export.h"
#include "base/macros.h"
namespace base {
namespace mac {
// Within a given scope, swaps method implementations of a class interface, or
// between two class interfaces. The argument and return types must match.
class BASE_EXPORT ScopedObjCClassSwizzler {
public:
// Given two classes that each respond to |selector|, swap the implementations
// of those methods.
ScopedObjCClassSwizzler(Class target, Class source, SEL selector);
// Given two selectors on the same class interface, |target| (e.g. via
// inheritance or categories), swap the implementations of methods |original|
// and |alternate|.
ScopedObjCClassSwizzler(Class target, SEL original, SEL alternate);
~ScopedObjCClassSwizzler();
// Return a callable function pointer for the replaced method. To call this
// from the replacing function, the first two arguments should be |self| and
// |_cmd|. These are followed by the (variadic) method arguments.
IMP GetOriginalImplementation();
private:
// Delegated constructor.
void Init(Class target, Class source, SEL original, SEL alternate);
Method old_selector_impl_;
Method new_selector_impl_;
DISALLOW_COPY_AND_ASSIGN(ScopedObjCClassSwizzler);
};
} // namespace mac
} // namespace base
#endif // BASE_MAC_SCOPED_OBJC_CLASS_SWIZZLER_H_
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