Trait FlowContractProvider 

pub trait FlowContractProvider {
    const FLOW_CONTRACT: FlowContract;
}

A handle can expose its data-flow contract once; registration faces then read it without repeating input/output strings. handle 只需声明一次数据流合同；注册面直接读取，不重复填写输入输出字符串。

Required Associated Constants

const FLOW_CONTRACT: FlowContract

The one contract this face declares, exposed as a compile-time constant. 本面声明的那一份合同，以编译期常量形式暴露。

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors