31 lines
991 B
C
31 lines
991 B
C
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// Copyright (c) 2012 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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// This defines helpful methods for dealing with Callbacks. Because Callbacks
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// are implemented using templates, with a class per callback signature, adding
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// methods to Callback<> itself is unattractive (lots of extra code gets
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// generated). Instead, consider adding methods here.
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//
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// ResetAndReturn(&cb) is like cb.Reset() but allows executing a callback (via a
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// copy) after the original callback is Reset(). This can be handy if Run()
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// reads/writes the variable holding the Callback.
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#ifndef BASE_CALLBACK_HELPERS_H_
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#define BASE_CALLBACK_HELPERS_H_
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#include "base/callback.h"
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namespace base {
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template <typename Sig>
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base::Callback<Sig> ResetAndReturn(base::Callback<Sig>* cb) {
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base::Callback<Sig> ret(*cb);
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cb->Reset();
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return ret;
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}
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} // namespace base
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#endif // BASE_CALLBACK_HELPERS_H_
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