| /* |
| * Copyright (c) 2020, The OpenThread Authors. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of the copyright holder nor the |
| * names of its contributors may be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| /** |
| * @file |
| * This file includes definitions for numeric limits. |
| */ |
| |
| #ifndef NUMERIC_LIMITS_HPP_ |
| #define NUMERIC_LIMITS_HPP_ |
| |
| #include <stdint.h> |
| |
| namespace ot { |
| |
| static constexpr uint8_t kBitsPerByte = 8; ///< Number of bits in a byte. |
| |
| /** |
| * Returns the bit-size (number of bits) of a given type or variable. |
| * |
| * @param[in] aItem The item (type or variable or expression) to get the bit-size of. |
| * |
| * @returns Number of bits of @p aItem. |
| */ |
| #define BitSizeOf(aItem) (sizeof(aItem) * kBitsPerByte) |
| |
| /** |
| * Determines number of byes to represent a given number of bits. |
| * |
| * @param[in] aBitSize The bit-size (number of bits). |
| * |
| * @returns Number of bytes to represent @p aBitSize. |
| */ |
| #define BytesForBitSize(aBitSize) static_cast<uint8_t>(((aBitSize) + (kBitsPerByte - 1)) / kBitsPerByte) |
| |
| /** |
| * Provides a way to query properties of arithmetic types. |
| * |
| * There are no members if `Type` is not a supported arithmetic type. |
| */ |
| template <typename Type> struct NumericLimits |
| { |
| }; |
| |
| // Specialization for different integral types. |
| |
| template <> struct NumericLimits<int8_t> |
| { |
| static constexpr int8_t kMin = INT8_MIN; |
| static constexpr int8_t kMax = INT8_MAX; |
| }; |
| |
| template <> struct NumericLimits<int16_t> |
| { |
| static constexpr int16_t kMin = INT16_MIN; |
| static constexpr int16_t kMax = INT16_MAX; |
| }; |
| |
| template <> struct NumericLimits<int32_t> |
| { |
| static constexpr int32_t kMin = INT32_MIN; |
| static constexpr int32_t kMax = INT32_MAX; |
| }; |
| |
| template <> struct NumericLimits<int64_t> |
| { |
| static constexpr int64_t kMin = INT64_MIN; |
| static constexpr int64_t kMax = INT64_MAX; |
| }; |
| |
| template <> struct NumericLimits<uint8_t> |
| { |
| static constexpr uint8_t kMin = 0; |
| static constexpr uint8_t kMax = UINT8_MAX; |
| }; |
| |
| template <> struct NumericLimits<uint16_t> |
| { |
| static constexpr uint16_t kMin = 0; |
| static constexpr uint16_t kMax = UINT16_MAX; |
| }; |
| |
| template <> struct NumericLimits<uint32_t> |
| { |
| static constexpr uint32_t kMin = 0; |
| static constexpr uint32_t kMax = UINT32_MAX; |
| }; |
| |
| template <> struct NumericLimits<uint64_t> |
| { |
| static constexpr uint64_t kMin = 0; |
| static constexpr uint64_t kMax = UINT64_MAX; |
| }; |
| |
| } // namespace ot |
| |
| #endif // NUMERIC_LIMITS_HPP_ |