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Add --gen-absl-hash option to generate AbslHashValue for structs. (#8868)

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This commit is contained in:
Derek Bailey
2025-12-19 11:49:50 -08:00
committed by GitHub
parent fb55e0c9de
commit 8cb53ccc95
15 changed files with 186 additions and 3 deletions
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42
tests/test.cpp
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@@ -26,6 +26,13 @@
#define INCLUDE_64_BIT_TESTS 1
#endif
#if __has_include("third_party/absl/container/flat_hash_set.h")
#define HAS_ABSL_CONTAINERS 1
#endif
#ifdef HAS_ABSL_CONTAINERS
#include "third_party/absl/container/flat_hash_set.h"
#endif
#include "alignment_test.h"
#include "evolution_test.h"
#include "flatbuffers/flatbuffers.h"
@@ -1665,6 +1672,40 @@ void UnionUnderlyingTypeTest() {
TEST_ASSERT(unpacked.test_vector_of_union == buffer.test_vector_of_union);
}
void StructsInHashTableTest() {
#if defined(HAS_ABSL_CONTAINERS) && (!defined(_MSC_VER) || _MSC_VER >= 1700)
absl::flat_hash_set<ArrayStruct> hash_set;
ArrayStruct array_struct_1;
array_struct_1.mutate_a(0.4);
for (int i = 0; i < array_struct_1.b()->size(); ++i) {
array_struct_1.mutable_b()->Mutate(i, i * 2);
}
for (int i = 0; i < array_struct_1.d()->size(); ++i) {
NestedStruct nested_struct;
nested_struct.mutable_a()->Mutate(0, i * 3);
array_struct_1.mutable_d()->Mutate(i, nested_struct);
}
ArrayStruct array_struct_2;
array_struct_2.mutate_e(999);
hash_set.insert(array_struct_1);
hash_set.insert(array_struct_2);
TEST_EQ(hash_set.size(), 2);
TEST_ASSERT(hash_set.contains(array_struct_1));
TEST_ASSERT(hash_set.contains(array_struct_2));
ArrayStruct array_struct_3 = array_struct_1;
array_struct_3.mutable_b()->Mutate(0, 2);
TEST_ASSERT(!hash_set.contains(array_struct_3));
hash_set.insert(array_struct_3);
TEST_ASSERT(hash_set.contains(array_struct_3));
#endif // defined(HAS_ABSL_CONTAINERS) && (!defined(_MSC_VER) || _MSC_VER >=
// 1700)
}
static void Offset64Tests() {
#if INCLUDE_64_BIT_TESTS
Offset64Test();
@@ -1794,6 +1835,7 @@ int FlatBufferTests(const std::string& tests_data_path) {
EmbeddedSchemaAccess();
Offset64Tests();
UnionUnderlyingTypeTest();
StructsInHashTableTest();
return 0;
}
} // namespace