v0.2.0

PROST! is a Protocol Buffers implementation for the Rust Language. prost generates simple, idiomatic Rust code from proto2 and proto3 files.

prost 0.2.0 includes many improvements over the previous version, including:

• The prost-codegen crate has been removed, and its functionality has been combined into prost-build.
• A new crate, prost-types, containing Protobuf well-known types has been added. The code generator will automatically use prost-types when well-known types are encountered during .proto → .rs code generation.
• Field accessors for proto2 optional fields and enum fields have been made more ergonomic.
• prost-build has a new builder API (prost_build::Config), which can be used to specify custom code generation options. Current options include:
  • Using BTreeMap instead of HashMap for map fields.
  • Custom code generation for protobuf service definitions.
• New prost-specific error types, prost::EncodeError and prost::DecodeError for encoding and decoding results.
• The prost::Message trait has been made more flexible, and more ergonomic.
• varint encoding and decoding has been optimized, see the following commit messages for results:
  • a655f2b
  • 107857f
  • 8a8c5dd
• Default values are now preserved during code generation (bugfix).
• New Message::clear method.