type_val

This project allows for the creation of type-level values. Any value can be type-level as long as it can be initialized as a constant. All type-level values implement the TypeVal trait, and so can be provided as type parameters.

TypeVal

A trait implemented by type-level values. The value of a TypeVal can be extracted through the VAL associated constant.

def_type_val

A macro is used to implement the TypeVal trait. Any number of values can be initialized with a single invocation, but every value in a single invocation must be either public or private. Attributes to be applied to items in a block, including doc comments, should go above their targets.

Example

// Private
def_type_val! {
    type One: i32 = 1;
    #[derive(Clone, Copy)]
    type True: bool = true;
}

// Public
def_type_val! {
    /// Negative one
    pub type NegOne: i32 = -1;
    pub type False: bool = false;
}