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Fix generation of C++ code with Optional<Enum> (#6155)

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This commit is contained in:
Vladimir Glavnyy
2020-10-03 00:27:30 +07:00
committed by GitHub
parent 0bdf2fa156
commit bbcc85fd4c
4 changed files with 11 additions and 10 deletions
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15
src/idl_gen_cpp.cpp
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@@ -1598,7 +1598,9 @@ class CppGenerator : public BaseGenerator {
std::string GetDefaultScalarValue(const FieldDef &field, bool is_ctor) {
const auto &type = field.value.type;
if (type.enum_def && IsScalar(type.base_type)) {
if (field.IsScalarOptional()) {
return GenOptionalNull();
} else if (type.enum_def && IsScalar(type.base_type)) {
auto ev = type.enum_def->FindByValue(field.value.constant);
if (ev) {
return WrapInNameSpace(type.enum_def->defined_namespace,
@@ -1620,8 +1622,7 @@ class CppGenerator : public BaseGenerator {
return "0";
}
} else {
return field.IsScalarOptional() ? GenOptionalNull()
: GenDefaultConstant(field);
return GenDefaultConstant(field);
}
}
@@ -1647,13 +1648,11 @@ class CppGenerator : public BaseGenerator {
code_.SetValue("PARAM_VALUE", "nullptr");
} else {
const auto &type = field.value.type;
if (field.IsScalarOptional()) {
code_.SetValue("PARAM_VALUE", GetDefaultScalarValue(field, false));
if (field.IsScalarOptional())
code_.SetValue("PARAM_TYPE", GenOptionalDecl(type));
code_.SetValue("PARAM_VALUE", GenOptionalNull());
} else {
else
code_.SetValue("PARAM_TYPE", GenTypeWire(type, " ", true));
code_.SetValue("PARAM_VALUE", GetDefaultScalarValue(field, false));
}
}
code_ += "{{PRE}}{{PARAM_TYPE}}{{PARAM_NAME}} = {{PARAM_VALUE}}\\";
}

2
tests/cpp17/generated_cpp17/optional_scalars_generated.h
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@@ -77,7 +77,7 @@ struct ScalarStuffT : public flatbuffers::NativeTable {
flatbuffers::Optional<double> maybe_f64 = flatbuffers::nullopt;
double default_f64 = 42.0;
bool just_bool = false;
flatbuffers::Optional<bool> maybe_bool = true;
flatbuffers::Optional<bool> maybe_bool = flatbuffers::nullopt;
bool default_bool = true;
optional_scalars::OptionalByte just_enum = optional_scalars::OptionalByte::None;
optional_scalars::OptionalByte default_enum = optional_scalars::OptionalByte::One;

2
tests/optional_scalars_generated.h
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@@ -116,7 +116,7 @@ struct ScalarStuffT : public flatbuffers::NativeTable {
maybe_f64(flatbuffers::nullopt),
default_f64(42.0),
just_bool(false),
maybe_bool(true),
maybe_bool(flatbuffers::nullopt),
default_bool(true),
just_enum(optional_scalars::OptionalByte_None),
default_enum(optional_scalars::OptionalByte_One) {

2
tests/test.cpp
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@@ -3516,6 +3516,8 @@ void OptionalScalarsTest() {
TEST_ASSERT(!opts->mutate_maybe_i16(-10));
optional_scalars::ScalarStuffT obj;
TEST_ASSERT(!obj.maybe_bool);
TEST_ASSERT(!obj.maybe_f32.has_value());
opts->UnPackTo(&obj);
TEST_ASSERT(!obj.maybe_bool);
TEST_ASSERT(!obj.maybe_f32.has_value());