tor-browser

The Tor Browser
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nsStyleAutoArray.h (2492B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #ifndef nsStyleAutoArray_h_
      8 #define nsStyleAutoArray_h_
      9 
     10 #include "mozilla/Assertions.h"
     11 #include "nsTArray.h"
     12 
     13 /**
     14 * An array of objects, similar to AutoTArray<T,1> but which is memmovable. It
     15 * always has length >= 1.
     16 */
     17 template <typename T>
     18 class nsStyleAutoArray {
     19 public:
     20  // This constructor places a single element in mFirstElement.
     21  enum WithSingleInitialElement { WITH_SINGLE_INITIAL_ELEMENT };
     22  explicit nsStyleAutoArray(WithSingleInitialElement) {}
     23 
     24  nsStyleAutoArray(const nsStyleAutoArray&) = delete;
     25  nsStyleAutoArray& operator=(const nsStyleAutoArray&) = delete;
     26 
     27  nsStyleAutoArray(nsStyleAutoArray&&) = default;
     28  nsStyleAutoArray& operator=(nsStyleAutoArray&&) = default;
     29 
     30  bool Assign(const nsStyleAutoArray& aOther, mozilla::fallible_t) {
     31    mFirstElement = aOther.mFirstElement;
     32    return mOtherElements.Assign(aOther.mOtherElements, mozilla::fallible);
     33  }
     34 
     35  nsStyleAutoArray Clone() const {
     36    nsStyleAutoArray res(WITH_SINGLE_INITIAL_ELEMENT);
     37    res.mFirstElement = mFirstElement;
     38    res.mOtherElements = mOtherElements.Clone();
     39    return res;
     40  }
     41 
     42  bool operator==(const nsStyleAutoArray& aOther) const {
     43    return Length() == aOther.Length() &&
     44           mFirstElement == aOther.mFirstElement &&
     45           mOtherElements == aOther.mOtherElements;
     46  }
     47  bool operator!=(const nsStyleAutoArray&) const = default;
     48 
     49  size_t Length() const { return mOtherElements.Length() + 1; }
     50  const T& operator[](size_t aIndex) const {
     51    return aIndex == 0 ? mFirstElement : mOtherElements[aIndex - 1];
     52  }
     53  T& operator[](size_t aIndex) {
     54    return aIndex == 0 ? mFirstElement : mOtherElements[aIndex - 1];
     55  }
     56 
     57  void EnsureLengthAtLeast(size_t aMinLen) {
     58    if (aMinLen > 0) {
     59      mOtherElements.EnsureLengthAtLeast(aMinLen - 1);
     60    }
     61  }
     62 
     63  void SetLengthNonZero(size_t aNewLen) {
     64    MOZ_ASSERT(aNewLen > 0);
     65    mOtherElements.SetLength(aNewLen - 1);
     66  }
     67 
     68  void TruncateLengthNonZero(size_t aNewLen) {
     69    MOZ_ASSERT(aNewLen > 0);
     70    MOZ_ASSERT(aNewLen <= Length());
     71    mOtherElements.TruncateLength(aNewLen - 1);
     72  }
     73 
     74 private:
     75  T mFirstElement;
     76  nsTArray<T> mOtherElements;
     77 };
     78 
     79 #endif /* nsStyleAutoArray_h_ */