gecko-dev/mfbt/Range.h
Nicholas Nethercote 199d172e78 Bug 892806 - Clean up InflateUTF8String() and related functions. r=terrence.
--HG--
extra : rebase_source : df901e9900fbd01f1adbe430b9ac52428499681f
2013-07-09 23:17:32 -07:00

52 lines
1.3 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/NullPtr.h"
#include "mozilla/RangedPtr.h"
#include <stddef.h>
namespace mozilla {
// Range<T> is a tuple containing a pointer and a length.
template <typename T>
class Range
{
RangedPtr<T> mStart;
RangedPtr<T> mEnd;
typedef void (Range::* ConvertibleToBool)();
void nonNull() {}
public:
Range() : mStart(nullptr, 0), mEnd(nullptr, 0) {}
Range(T* p, size_t len)
: mStart(p, p, p + len),
mEnd(p + len, p, p + len)
{}
RangedPtr<T> start() const { return mStart; }
RangedPtr<T> end() const { return mEnd; }
size_t length() const { return mEnd - mStart; }
T& operator[](size_t offset) {
return mStart[offset];
}
const T& operator[](size_t offset) const {
return mStart[offset];
}
operator ConvertibleToBool() const { return mStart ? &Range::nonNull : 0; }
};
} // namespace mozilla
#endif /* mozilla_Range_h */