// // Copyright 2018 Pixar // // Licensed under the Apache License, Version 2.0 (the "Apache License") // with the following modification; you may not use this file except in // compliance with the Apache License and the following modification to it: // Section 6. Trademarks. is deleted and replaced with: // // 6. Trademarks. This License does not grant permission to use the trade // names, trademarks, service marks, or product names of the Licensor // and its affiliates, except as required to comply with Section 4(c) of // the License and to reproduce the content of the NOTICE file. // // You may obtain a copy of the Apache License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the Apache License with the above modification is // distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY // KIND, either express or implied. See the Apache License for the specific // language governing permissions and limitations under the Apache License. // #ifndef PXR_BASE_TRACE_STRING_HASH_H #define PXR_BASE_TRACE_STRING_HASH_H #include "pxr/pxr.h" #include PXR_NAMESPACE_OPEN_SCOPE /////////////////////////////////////////////////////////////////////////////// /// /// \class TraceStringHash /// /// This class provides a function to compute compile time hashes for string /// literals. /// class TraceStringHash { public: /// Computes a compile time hash of \p str. template static constexpr std::uint32_t Hash(const char (&str)[N]) { return djb2HashStr(str); } private: // Recursive function computing the xor variant of the djb2 hash // function. template static constexpr std::uint32_t djb2HashStr(const char* str) { return (djb2HashStr(str) * 33) ^ str[N-1]; } }; // Template recursion base case. template <> constexpr std::uint32_t TraceStringHash::djb2HashStr<0>(const char* str) { return 5381; } PXR_NAMESPACE_CLOSE_SCOPE #endif //PXR_BASE_TRACE_STRING_HASH_H