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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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35
src/idl_gen_cpp.cpp
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@@ -2311,6 +2311,34 @@ class CppGenerator : public BaseGenerator {
code_ += "";
}
void GenAbslHashValue(const StructDef& struct_def) {
code_ += "template <typename H>";
code_ += "inline H AbslHashValue(H h, const {{NATIVE_NAME}} &obj) {";
std::string combine_args;
for (const auto& field : struct_def.fields.vec) {
if (field->deprecated) {
continue;
}
if (IsArray(field->value.type)) {
const auto field_accessor = "obj." + Name(*field) + "()";
const auto& element_type = field->value.type.VectorType();
if (IsStruct(element_type)) {
code_ += " for (const auto* element : *" + field_accessor + ") {";
code_ += " h = H::combine(std::move(h), *element);";
code_ += " }";
} else {
code_ += " for (auto element : *" + field_accessor + ") {";
code_ += " h = H::combine(std::move(h), element);";
code_ += " }";
}
} else {
combine_args += ", obj." + Name(*field) + "()";
}
}
code_ += " return H::combine(std::move(h)" + combine_args + ");";
code_ += "}";
}
void GenOperatorNewDelete(const StructDef& struct_def) {
if (auto native_custom_alloc =
struct_def.attributes.Lookup("native_custom_alloc")) {
@@ -4281,7 +4309,12 @@ class CppGenerator : public BaseGenerator {
code_.SetValue("STRUCT_BYTE_SIZE", NumToString(struct_def.bytesize));
code_ += "FLATBUFFERS_STRUCT_END({{STRUCT_NAME}}, {{STRUCT_BYTE_SIZE}});";
if (opts_.gen_compare) GenCompareOperator(struct_def, "()");
if (opts_.gen_compare) {
GenCompareOperator(struct_def, "()");
}
if (opts_.gen_absl_hash) {
GenAbslHashValue(struct_def);
}
code_ += "";
// Definition for type traits for this table type. This allows querying var-