mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-12-01 00:32:11 +00:00
87 lines
2.1 KiB
C++
87 lines
2.1 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_IntegerTypeTraits_h
|
|
#define mozilla_IntegerTypeTraits_h
|
|
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
#include <type_traits>
|
|
|
|
namespace mozilla {
|
|
|
|
namespace detail {
|
|
|
|
/**
|
|
* StdintTypeForSizeAndSignedness returns the stdint integer type
|
|
* of given size (can be 1, 2, 4 or 8) and given signedness
|
|
* (false means unsigned, true means signed).
|
|
*/
|
|
template <size_t Size, bool Signedness>
|
|
struct StdintTypeForSizeAndSignedness;
|
|
|
|
template <>
|
|
struct StdintTypeForSizeAndSignedness<1, true> {
|
|
typedef int8_t Type;
|
|
};
|
|
|
|
template <>
|
|
struct StdintTypeForSizeAndSignedness<1, false> {
|
|
typedef uint8_t Type;
|
|
};
|
|
|
|
template <>
|
|
struct StdintTypeForSizeAndSignedness<2, true> {
|
|
typedef int16_t Type;
|
|
};
|
|
|
|
template <>
|
|
struct StdintTypeForSizeAndSignedness<2, false> {
|
|
typedef uint16_t Type;
|
|
};
|
|
|
|
template <>
|
|
struct StdintTypeForSizeAndSignedness<4, true> {
|
|
typedef int32_t Type;
|
|
};
|
|
|
|
template <>
|
|
struct StdintTypeForSizeAndSignedness<4, false> {
|
|
typedef uint32_t Type;
|
|
};
|
|
|
|
template <>
|
|
struct StdintTypeForSizeAndSignedness<8, true> {
|
|
typedef int64_t Type;
|
|
};
|
|
|
|
template <>
|
|
struct StdintTypeForSizeAndSignedness<8, false> {
|
|
typedef uint64_t Type;
|
|
};
|
|
|
|
} // namespace detail
|
|
|
|
template <size_t Size>
|
|
struct UnsignedStdintTypeForSize
|
|
: detail::StdintTypeForSizeAndSignedness<Size, false> {};
|
|
|
|
template <size_t Size>
|
|
struct SignedStdintTypeForSize
|
|
: detail::StdintTypeForSizeAndSignedness<Size, true> {};
|
|
|
|
template <typename IntegerType>
|
|
struct PositionOfSignBit {
|
|
static_assert(std::is_integral_v<IntegerType>,
|
|
"PositionOfSignBit is only for integral types");
|
|
// 8 here should be CHAR_BIT from limits.h, but the world has moved on.
|
|
static const size_t value = 8 * sizeof(IntegerType) - 1;
|
|
};
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif // mozilla_IntegerTypeTraits_h
|