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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsStyleAutoArray_h_
#define nsStyleAutoArray_h_
#include "nsTArray.h"
#include "mozilla/Assertions.h"
/**
* An array of objects, similar to AutoTArray<T,1> but which is memmovable. It
* always has length >= 1.
*/
template <typename T>
class nsStyleAutoArray {
public:
// This constructor places a single element in mFirstElement.
enum WithSingleInitialElement { WITH_SINGLE_INITIAL_ELEMENT };
explicit nsStyleAutoArray(WithSingleInitialElement) {}
nsStyleAutoArray(const nsStyleAutoArray&) = delete;
nsStyleAutoArray& operator=(const nsStyleAutoArray&) = delete;
nsStyleAutoArray(nsStyleAutoArray&&) = default;
nsStyleAutoArray& operator=(nsStyleAutoArray&&) = default;
bool Assign(const nsStyleAutoArray& aOther, mozilla::fallible_t) {
mFirstElement = aOther.mFirstElement;
return mOtherElements.Assign(aOther.mOtherElements, mozilla::fallible);
}
nsStyleAutoArray Clone() const {
nsStyleAutoArray res(WITH_SINGLE_INITIAL_ELEMENT);
res.mFirstElement = mFirstElement;
res.mOtherElements = mOtherElements.Clone();
return res;
}
bool operator==(const nsStyleAutoArray& aOther) const {
return Length() == aOther.Length() &&
mFirstElement == aOther.mFirstElement &&
mOtherElements == aOther.mOtherElements;
}
bool operator!=(const nsStyleAutoArray& aOther) const {
return !(*this == aOther);
}
size_t Length() const { return mOtherElements.Length() + 1; }
const T& operator[](size_t aIndex) const {
return aIndex == 0 ? mFirstElement : mOtherElements[aIndex - 1];
}
T& operator[](size_t aIndex) {
return aIndex == 0 ? mFirstElement : mOtherElements[aIndex - 1];
}
void EnsureLengthAtLeast(size_t aMinLen) {
if (aMinLen > 0) {
mOtherElements.EnsureLengthAtLeast(aMinLen - 1);
}
}
void SetLengthNonZero(size_t aNewLen) {
MOZ_ASSERT(aNewLen > 0);
mOtherElements.SetLength(aNewLen - 1);
}
void TruncateLengthNonZero(size_t aNewLen) {
MOZ_ASSERT(aNewLen > 0);
MOZ_ASSERT(aNewLen <= Length());
mOtherElements.TruncateLength(aNewLen - 1);
}
private:
T mFirstElement;
nsTArray<T> mOtherElements;
};
#endif /* nsStyleAutoArray_h_ */
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