Derive Macro TypewayCodec 

#[derive(TypewayCodec)]
{
    // Attributes available to this derive:
    #[proto]
}

Derive TypewayEncode and TypewayDecode for a struct.

Generates specialized encode/decode functions with no runtime dispatch. Each field is encoded/decoded directly based on its Rust type and proto tag number.

Attributes

• #[proto(tag = N)] — Set the protobuf field tag number (default: 1-indexed position)

Supported field types

Rust type	Proto type	Wire type
u32	uint32	varint (0)
u64	uint64	varint (0)
i32	int32	varint (0)
i64	int64	varint (0)
bool	bool	varint (0)
f32	float	32-bit (5)
f64	double	64-bit (1)
String	string	len-delimited (2)
Vec<u8>	bytes	len-delimited (2)
Vec<T>	repeated T	(varies)
Option<T>	optional T	(varies)

Example

#[derive(TypewayCodec)]
struct User {
    #[proto(tag = 1)]
    id: u32,
    #[proto(tag = 2)]
    name: String,
    #[proto(tag = 3)]
    active: bool,
}