6 releases
Uses old Rust 2015
0.3.3 | Sep 5, 2017 |
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0.3.2 | Sep 4, 2017 |
0.2.1 | Sep 4, 2017 |
0.1.1 | Sep 4, 2017 |
#357 in No standard library
5KB
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
This macro is used to implement the
TypeVal trait. Any number of values
can be initialized with a single
invocation. Items prefixed by pub
are public. Attributes to be applied
to items in a block, including doc
comments, should go above their
targets.
Example
def_type_val! {
type One: i32 = 1;
#[derive(Clone, Copy)]
type True: bool = true;
/// Negative one
pub type NegOne: i32 = -1;
pub type False: bool = false;
}
println!("One = {}, True = {}, NegOne = {}, False = {}",
One::VAL,
True::VAL,
NegOne::VAL,
False::VAL);
How to Obtain
This project is available on crates.io here.