1  
 2  //              Copyright Catch2 Authors
 3  // Distributed under the Boost Software License, Version 1.0.
 4  //   (See accompanying file LICENSE.txt or copy at
 5  //        https://www.boost.org/LICENSE_1_0.txt)
 6  
 7  // SPDX-License-Identifier: BSL-1.0
 8  
 9  #include <catch2/catch_test_case_info.hpp>
10  #include <catch2/internal/catch_test_case_info_hasher.hpp>
11  
12  namespace Catch {
13      TestCaseInfoHasher::TestCaseInfoHasher( hash_t seed ): m_seed( seed ) {}
14  
15      uint32_t TestCaseInfoHasher::operator()( TestCaseInfo const& t ) const {
16          // FNV-1a hash algorithm that is designed for uniqueness:
17          const hash_t prime = 1099511628211u;
18          hash_t hash = 14695981039346656037u;
19          for ( const char c : t.name ) {
20              hash ^= c;
21              hash *= prime;
22          }
23          for ( const char c : t.className ) {
24              hash ^= c;
25              hash *= prime;
26          }
27          for ( const Tag& tag : t.tags ) {
28              for ( const char c : tag.original ) {
29                  hash ^= c;
30                  hash *= prime;
31              }
32          }
33          hash ^= m_seed;
34          hash *= prime;
35          const uint32_t low{ static_cast<uint32_t>( hash ) };
36          const uint32_t high{ static_cast<uint32_t>( hash >> 32 ) };
37          return low * high;
38      }
39  } // namespace Catch