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82 lines
2.5 KiB
C++
82 lines
2.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsStyleAutoArray_h_
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#define nsStyleAutoArray_h_
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#include "nsTArray.h"
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#include "mozilla/Assertions.h"
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/**
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* An array of objects, similar to AutoTArray<T,1> but which is memmovable. It
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* always has length >= 1.
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*/
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template <typename T>
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class nsStyleAutoArray {
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public:
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// This constructor places a single element in mFirstElement.
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enum WithSingleInitialElement { WITH_SINGLE_INITIAL_ELEMENT };
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explicit nsStyleAutoArray(WithSingleInitialElement) {}
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nsStyleAutoArray(const nsStyleAutoArray&) = delete;
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nsStyleAutoArray& operator=(const nsStyleAutoArray&) = delete;
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nsStyleAutoArray(nsStyleAutoArray&&) = default;
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nsStyleAutoArray& operator=(nsStyleAutoArray&&) = default;
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bool Assign(const nsStyleAutoArray& aOther, mozilla::fallible_t) {
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mFirstElement = aOther.mFirstElement;
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return mOtherElements.Assign(aOther.mOtherElements, mozilla::fallible);
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}
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nsStyleAutoArray Clone() const {
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nsStyleAutoArray res(WITH_SINGLE_INITIAL_ELEMENT);
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res.mFirstElement = mFirstElement;
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res.mOtherElements = mOtherElements.Clone();
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return res;
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}
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bool operator==(const nsStyleAutoArray& aOther) const {
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return Length() == aOther.Length() &&
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mFirstElement == aOther.mFirstElement &&
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mOtherElements == aOther.mOtherElements;
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}
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bool operator!=(const nsStyleAutoArray& aOther) const {
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return !(*this == aOther);
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}
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size_t Length() const { return mOtherElements.Length() + 1; }
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const T& operator[](size_t aIndex) const {
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return aIndex == 0 ? mFirstElement : mOtherElements[aIndex - 1];
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}
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T& operator[](size_t aIndex) {
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return aIndex == 0 ? mFirstElement : mOtherElements[aIndex - 1];
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}
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void EnsureLengthAtLeast(size_t aMinLen) {
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if (aMinLen > 0) {
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mOtherElements.EnsureLengthAtLeast(aMinLen - 1);
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}
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}
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void SetLengthNonZero(size_t aNewLen) {
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MOZ_ASSERT(aNewLen > 0);
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mOtherElements.SetLength(aNewLen - 1);
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}
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void TruncateLengthNonZero(size_t aNewLen) {
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MOZ_ASSERT(aNewLen > 0);
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MOZ_ASSERT(aNewLen <= Length());
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mOtherElements.TruncateLength(aNewLen - 1);
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}
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private:
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T mFirstElement;
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nsTArray<T> mOtherElements;
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};
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#endif /* nsStyleAutoArray_h_ */
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