| {%- set class_name = union.name ~ "_Data" -%} |
| {%- set enum_name = union.name ~ "_Tag" -%} |
| {%- import "struct_macros.tmpl" as struct_macros %} |
| |
| class {{class_name}} { |
| public: |
| // Used to identify Mojom Union Data Classes. |
| typedef void MojomUnionDataType; |
| static {{class_name}}* New(mojo::internal::Buffer* buf); |
| {{class_name}}(); |
| // Do nothing in the destructor since it won't be called. |
| ~{{class_name}}() {} |
| |
| static bool Validate(const void* data, |
| mojo::internal::BoundsChecker* bounds_checker, |
| bool inlined); |
| |
| bool is_null() const { |
| return size == 0; |
| } |
| |
| void set_null(); |
| |
| enum class {{enum_name}} : uint32_t { |
| {% for field in union.fields %} |
| {{field.name|upper}}, |
| {%- endfor %} |
| }; |
| |
| // A note on layout: |
| // "Each non-static data member is allocated as if it were the sole member of |
| // a struct." - Section 9.5.2 ISO/IEC 14882:2011 (The C++ Spec) |
| union MOJO_ALIGNAS(8) Union_ { |
| {%- for field in union.fields %} |
| {%- if field.kind.spec == 'b' %} |
| uint8_t f_{{field.name}} : 1; |
| {%- else %} |
| {{field.kind|cpp_union_field_type}} f_{{field.name}}; |
| {%- endif %} |
| {%- endfor %} |
| uint64_t unknown; |
| }; |
| |
| uint32_t size; |
| {{enum_name}} tag; |
| Union_ data; |
| |
| void EncodePointersAndHandles(std::vector<mojo::Handle>* handles); |
| void DecodePointersAndHandles(std::vector<mojo::Handle>* handles); |
| }; |
| static_assert(sizeof({{class_name}}) == 16, |
| "Bad sizeof({{class_name}})"); |
| static_assert(sizeof({{class_name}}::Union_) == 8, |
| "Bad sizeof({{class_name}}::Union_)"); |