mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-24 13:21:05 +00:00
91 lines
2.3 KiB
C++
91 lines
2.3 KiB
C++
/* -*- 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 */
|