/* -*- 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 mozilla_Range_h #define mozilla_Range_h #include "mozilla/RangedPtr.h" #include "mozilla/TypeTraits.h" #include "mozilla/Span.h" #include <stddef.h> namespace mozilla { // Range<T> is a tuple containing a pointer and a length. template <typename T> class Range { const RangedPtr<T> mStart; const RangedPtr<T> mEnd; public: Range() : mStart(nullptr, 0), mEnd(nullptr, 0) {} Range(T* aPtr, size_t aLength) : mStart(aPtr, aPtr, aPtr + aLength), mEnd(aPtr + aLength, aPtr, aPtr + aLength) {} Range(const RangedPtr<T>& aStart, const RangedPtr<T>& aEnd) : mStart(aStart.get(), aStart.get(), aEnd.get()), mEnd(aEnd.get(), aStart.get(), aEnd.get()) { // Only accept two RangedPtrs within the same range. aStart.checkIdenticalRange(aEnd); MOZ_ASSERT(aStart <= aEnd); } template<typename U, class = typename EnableIf<IsConvertible<U (*)[], T (*)[]>::value, int>::Type> MOZ_IMPLICIT Range(const Range<U>& aOther) : mStart(aOther.mStart), mEnd(aOther.mEnd) {} MOZ_IMPLICIT Range(Span<T> aSpan) : Range(aSpan.Elements(), aSpan.Length()) { } template<typename U, class = typename EnableIf<IsConvertible<U (*)[], T (*)[]>::value, int>::Type> MOZ_IMPLICIT Range(const Span<U>& aSpan) : Range(aSpan.Elements(), aSpan.Length()) { } RangedPtr<T> begin() const { return mStart; } RangedPtr<T> end() const { return mEnd; } size_t length() const { return mEnd - mStart; } T& operator[](size_t aOffset) const { return mStart[aOffset]; } explicit operator bool() const { return mStart != nullptr; } operator Span<T>() { return Span<T>(mStart.get(), length()); } operator Span<const T>() const { return Span<T>(mStart.get(), length()); } }; template<class T> Span<T> MakeSpan(Range<T>& aRange) { return aRange; } template<class T> Span<const T> MakeSpan(const Range<T>& aRange) { return aRange; } } // namespace mozilla #endif /* mozilla_Range_h */