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