Module postcard::experimental

Experimental Postcard Features

Items inside this module require various feature flags, and are not subject to SemVer stability. Items may be removed or deprecated at any point.

Derive

The experimental-derive feature enables one experimental feature:

• Max size calculation

Max Size Calculation

This features enables calculation of the Max serialized size of a message as an associated usize constant called POSTCARD_MAX_SIZE. It also provides a #[derive(MaxSize)] macro that can be used for calculating user types.

This is useful for determining the maximum buffer size needed when recieving or sending a message that has been serialized.

NOTE: This only covers the size of “plain” flavored messages, e.g. not with COBS or any other Flavors applied. The overhead for these flavors must be calculated separately.

Please report any missing types, or any incorrectly calculated values.

Message Schema Generation

This now lives in the postcard-schema crate.

Functions

• serialized_size
  Compute the size of the postcard serialization of T.