68 lines
3.2 KiB
Markdown
68 lines
3.2 KiB
Markdown
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# Protozero Cheat Sheet
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See also this
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[handy table](https://developers.google.com/protocol-buffers/docs/proto#scalar)
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from the Google Protocol Buffers documentation.
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## Scalar types
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| PBF Type | Underlying Storage | C++ Type | Getter | Notes |
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| -------- | ------------------ | ------------- | ---------------- | ----- |
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| int32 | varint | `int32_t` | `get_int32()` | |
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| sint32 | varint (zigzag) | `int32_t` | `get_sint32()` | |
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| uint32 | varint | `uint32_t` | `get_uint32()` | |
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| int64 | varint | `int64_t` | `get_int64()` | |
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| sint64 | varint (zigzag) | `int64_t` | `get_sint64()` | |
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| uint64 | varint | `uint64_t` | `get_uint64()` | |
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| bool | varint | `bool` | `get_bool()` | |
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| enum | varint | `int32_t` | `get_enum()` | |
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| fixed32 | 32bit fixed | `uint32_t` | `get_fixed32()` | |
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| sfixed32 | 32bit fixed | `int32_t` | `get_sfixed32()` | |
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| fixed64 | 64bit fixed | `uint64_t` | `get_fixed64()` | |
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| sfixed64 | 64bit fixed | `int64_t` | `get_sfixed64()` | |
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| float | 32bit fixed | `float` | `get_float()` | |
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| double | 64bit fixed | `double` | `get_double()` | |
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| string | length-delimited | `data_view` | `get_view()` | (1) |
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| string | length-delimited | pair | `get_data()` | (2) |
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| string | length-delimited | `std::string` | `get_string()` | |
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| bytes | length-delimited | `data_view` | `get_view()` | (1) |
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| bytes | length-delimited | pair | `get_data()` | (2) |
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| bytes | length-delimited | `std::string` | `get_bytes()` | |
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| message | length-delimited | `data_view` | `get_view()` | (1) |
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| message | length-delimited | pair | `get_data()` | (2) |
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| message | length-delimited | `pbf_reader` | `get_message()` | |
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### Notes:
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* (1) preferred form, returns `protozero::data_view` which is convertible to
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`std::string` if needed.
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* (2) deprecated form, returns `std::pair<const char*, pbf_length_type>`,
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use `get_view()` instead. This form is only available if
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`PROTOZERO_STRICT_API` is not defined.
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* The setter function of `pbf_writer` is always `add_` + the PBF type. Several
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overloads are available.
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## Packed repeated fields
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| PBF Type | Getter |
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| -------- | ----------------------- |
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| int32 | `get_packed_int32()` |
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| sint32 | `get_packed_sint32()` |
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| uint32 | `get_packed_uint32()` |
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| int64 | `get_packed_int64()` |
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| sint64 | `get_packed_sint64()` |
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| uint64 | `get_packed_uint64()` |
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| bool | `get_packed_bool()` |
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| enum | `get_packed_enum()` |
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| fixed32 | `get_packed_fixed32()` |
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| sfixed32 | `get_packed_sfixed32()` |
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| fixed64 | `get_packed_fixed64()` |
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| sfixed64 | `get_packed_sfixed64()` |
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| float | `get_packed_float()` |
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| double | `get_packed_double()` |
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Packed repeated fields for string, bytes, and message types are not possible.
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