Cap’n Proto is an insanely fast data interchange format and capability-based RPC system. This interchange data format is designed to be fast by avoiding need for parsing or serialising data.
- No parsing: Cap’n Proto directly maps the serialized data to memory structures without needing to parse or serialize.
- Fast: It’s very efficient for both read and write operations due to its zero-copy design.
- Compact: Data is stored compactly without needing additional metadata during serialization.
commonly used in systems that require high-performance data exchange, such as RPC systems, logging, or low-latency services.
Example:
struct Person {
name @0 :Text;
age @1 :Int32;
friends @2 :List(Person);
}We can use capnp compiler to compile this message to any language.