1 /* 2 * Copyright (c) 2024, The OpenThread Authors. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 3. Neither the name of the copyright holder nor the 13 * names of its contributors may be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /** 30 * @file 31 * This file provides a compile time counter and utilities based on it. 32 */ 33 34 #ifndef OT_UTILS_STATIC_COUNTER_HPP_ 35 #define OT_UTILS_STATIC_COUNTER_HPP_ 36 37 namespace ot { 38 39 template <int N> struct StaticInt : public StaticInt<N - 1> 40 { 41 public: 42 static constexpr int kValue = N; 43 }; 44 45 template <> struct StaticInt<0> 46 { 47 public: 48 static constexpr int kValue = 0; 49 }; 50 51 #define StaticCounterInit(N) static constexpr StaticInt<N> StaticCounter(StaticInt<N>) 52 53 #define StaticCounterValue() decltype(StaticCounter(StaticInt<255>{}))::kValue 54 55 #define StaticCounterIncr() \ 56 static constexpr StaticInt<StaticCounterValue() + 1> StaticCounter(StaticInt<StaticCounterValue() + 1>) 57 58 #define InitEnumValidatorCounter() StaticCounterInit(0) 59 60 #define ValidateNextEnum(kEnumartor) \ 61 static_assert(kEnumartor == StaticCounterValue(), #kEnumartor " value is incorrect"); \ 62 StaticCounterIncr() 63 64 #define SkipNextEnum() StaticCounterIncr() 65 66 } // namespace ot 67 68 #endif // OT_UTILS_STATIC_COUNTER_HPP_ 69
