Macro type_val::def_type_val

macro_rules! def_type_val {
    {$($(#[$attr:meta])* type $name:ident: $type:ident = $value:expr;)+} => { ... };
    {$($(#[$attr:meta])* pub type $name:ident: $type:ident = $value:expr;)+} => { ... };
}

This 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;
}