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[style] simplify checking conditional enum values (openthread#10843)
This commit adds a compile time utility to check that enum values are in order, which eliminates calculating the actual value of conditional enum values in source code.
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| /* | ||
| * Copyright (c) 2024, 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. | ||
| */ | ||
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| /** | ||
| * @file | ||
| * This file provides a compile time counter and utilities based on it. | ||
| */ | ||
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| #ifndef OT_UTILS_STATIC_COUNTER_HPP_ | ||
| #define OT_UTILS_STATIC_COUNTER_HPP_ | ||
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| namespace ot { | ||
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| template <int N> struct StaticInt : public StaticInt<N - 1> | ||
| { | ||
| public: | ||
| static constexpr int kValue = N; | ||
| }; | ||
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| template <> struct StaticInt<0> | ||
| { | ||
| public: | ||
| static constexpr int kValue = 0; | ||
| }; | ||
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| #define StaticCounterInit(N) static constexpr StaticInt<N> StaticCounter(StaticInt<N>) | ||
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| #define StaticCounterValue() decltype(StaticCounter(StaticInt<255>{}))::kValue | ||
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| #define StaticCounterIncr() \ | ||
| static constexpr StaticInt<StaticCounterValue() + 1> StaticCounter(StaticInt<StaticCounterValue() + 1>) | ||
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| #define InitEnumValidatorCounter() StaticCounterInit(0) | ||
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| #define ValidateNextEnum(kEnumartor) \ | ||
| static_assert(kEnumartor == StaticCounterValue(), #kEnumartor " value is incorrect"); \ | ||
| StaticCounterIncr() | ||
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| } // namespace ot | ||
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| #endif // OT_UTILS_STATIC_COUNTER_HPP_ |