1 /* 2 * Copyright 2020 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #pragma once 18 19 #include <limits> 20 #include <type_traits> 21 22 namespace bluetooth { 23 namespace common { 24 25 // Check if input is within numeric limits of RawType 26 template <typename RawType, typename InputType> IsNumberInNumericLimits(InputType input)27bool IsNumberInNumericLimits(InputType input) { 28 // Only arithmetic types are supported 29 static_assert(std::is_arithmetic_v<RawType> && std::is_arithmetic_v<InputType>); 30 // Either both are signed or both are unsigned 31 static_assert( 32 (std::is_signed_v<RawType> && std::is_signed_v<InputType>) || 33 (std::is_unsigned_v<RawType> && std::is_unsigned_v<InputType>)); 34 if (std::numeric_limits<InputType>::max() > std::numeric_limits<RawType>::max()) { 35 if (input > std::numeric_limits<RawType>::max()) { 36 return false; 37 } 38 } 39 if (std::numeric_limits<InputType>::lowest() < std::numeric_limits<RawType>::lowest()) { 40 if (input < std::numeric_limits<RawType>::lowest()) { 41 return false; 42 } 43 } 44 return true; 45 } 46 47 } // namespace common 48 } // namespace bluetooth