Appendix B: Scalar Value Types

This document addendum to the OpenCannabis Specification enumerates Scalar Value Types, or raw native types used in the specification. This list originates directly from Google's Protobuf documentation.

Type Notes C++ Type Java Type Python Type
double Generic double-precision floating point number. double double float
float Generic standard-precision floating point number. float float float
int32 Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint32 instead. int32 int int
int64 Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint64 instead. int64 long int/long
uint32 Uses variable-length encoding. uint32 int int/long
uint64 Uses variable-length encoding. uint64 long int/long
sint32 Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int32s. int32 int int
sint64 Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int64s. int64 long int/long
fixed32 Always four bytes. More efficient than uint32 if values are often greater than 2^28. uint32 int int
fixed64 Always eight bytes. More efficient than uint64 if values are often greater than 2^56. uint64 long int/long
sfixed32 Always four bytes. int32 int int
sfixed64 Always eight bytes. int64 long int/long
bool Boolean value of true or false. Default value is false. bool boolean boolean
string A string must always contain UTF-8 encoded or 7-bit ASCII text. string String str/unicode
bytes May contain any arbitrary sequence of bytes. string ByteString str

Subpart 1: Default Values

From Protobuf's documentation:

When a message is parsed, if the encoded message does not contain a particular singular element, the corresponding field in the parsed object is set to the default value for that field. These defaults are type-specific:

  • For strings, the default value is the empty string.
  • For bytes, the default value is empty bytes.
  • For bools, the default value is false.
  • For numeric types, the default value is zero.
  • For enums, the default value is the first defined enum value, which must be 0.
  • For message fields, the field is not set. Its exact value is language-dependent. See the generated code guide for details.

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