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66 lines
1.3 KiB
C++
66 lines
1.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
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/* vim: set ts=2 sw=2 et tw=79: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_bindings_Nullable_h
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#define mozilla_dom_bindings_Nullable_h
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#include "mozilla/Assertions.h"
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namespace mozilla {
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namespace dom {
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namespace bindings {
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// Support for nullable types
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template <typename T>
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struct Nullable
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{
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private:
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T mValue;
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bool mIsNull;
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public:
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Nullable()
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: mIsNull(true)
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{}
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Nullable(T aValue)
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: mValue(aValue)
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, mIsNull(false)
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{}
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void SetValue(T aValue) {
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mValue = aValue;
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mIsNull = false;
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}
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// For cases when |T| is some type with nontrivial copy behavior, we may want
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// to get a reference to our internal copy of T and work with it directly
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// instead of relying on the copying version of SetValue().
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T& SetValue() {
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mIsNull = false;
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return mValue;
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}
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void SetNull() {
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mIsNull = true;
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}
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const T& Value() const {
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MOZ_ASSERT(!mIsNull);
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return mValue;
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}
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bool IsNull() const {
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return mIsNull;
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}
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};
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} // namespace bindings
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} // namespace dom
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} // namespace mozilla
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#endif /* mozilla_dom_bindings_Nullable_h */
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