mirror of
https://github.com/mozilla/gecko-dev.git
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121 lines
3.6 KiB
C++
121 lines
3.6 KiB
C++
/*
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* Copyright (c) 2008-2015 Mozilla Foundation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#ifndef jArray_h
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#define jArray_h
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#include "mozilla/Attributes.h"
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#include "mozilla/BinarySearch.h"
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#include "nsDebug.h"
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template<class T, class L>
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struct staticJArray {
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const T* arr;
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const L length;
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operator T*() { return arr; }
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T& operator[] (L const index) {
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MOZ_ASSERT(index >= 0, "Array access with negative index.");
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MOZ_ASSERT(index < length, "Array index out of bounds.");
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return ((T*)arr)[index];
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}
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L binarySearch(T const elem) {
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size_t idx;
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bool found = mozilla::BinarySearch(arr, 0, length, elem, &idx);
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return found ? idx : -1;
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}
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};
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template<class T, class L>
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struct jArray {
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T* arr;
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L length;
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static jArray<T,L> newJArray(L const len) {
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MOZ_ASSERT(len >= 0, "Negative length.");
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jArray<T,L> newArray = { new T[size_t(len)], len };
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return newArray;
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}
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static jArray<T,L> newFallibleJArray(L const len) {
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MOZ_ASSERT(len >= 0, "Negative length.");
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T* a = new (mozilla::fallible) T[size_t(len)];
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jArray<T,L> newArray = { a, a ? len : 0 };
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return newArray;
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}
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operator T*() { return arr; }
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T& operator[] (L const index) {
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MOZ_ASSERT(index >= 0, "Array access with negative index.");
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MOZ_ASSERT(index < length, "Array index out of bounds.");
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return arr[index];
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}
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void operator=(staticJArray<T,L>& other) {
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arr = (T*)other.arr;
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length = other.length;
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}
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};
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template<class T, class L>
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class autoJArray {
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private:
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T* arr;
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public:
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L length;
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autoJArray()
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: arr(0)
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, length(0)
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{
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}
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MOZ_IMPLICIT autoJArray(const jArray<T,L>& other)
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: arr(other.arr)
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, length(other.length)
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{
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}
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~autoJArray()
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{
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delete[] arr;
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}
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operator T*() { return arr; }
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T& operator[] (L const index) {
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MOZ_ASSERT(index >= 0, "Array access with negative index.");
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MOZ_ASSERT(index < length, "Array index out of bounds.");
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return arr[index];
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}
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operator jArray<T,L>() {
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// WARNING! This makes it possible to goof with buffer ownership!
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// This is needed for the getStack and getListOfActiveFormattingElements
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// methods to work sensibly.
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jArray<T,L> newArray = { arr, length };
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return newArray;
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}
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void operator=(const jArray<T,L>& other) {
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delete[] arr;
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arr = other.arr;
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length = other.length;
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}
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void operator=(decltype(nullptr)) {
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// Make assigning null to an array in Java delete the buffer in C++
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delete[] arr;
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arr = nullptr;
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length = 0;
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}
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};
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#endif // jArray_h
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