Macro lhlist::lhlist

macro_rules! lhlist {
    () => { ... };
    ($label:ty = $value:expr) => { ... };
    ($label:ty = $value:expr, $($rest:tt)*) => { ... };
}

Macro for creating labeled heterogeneous lists.

Create an LVCons label-value cons-list based on a comma-separated list of <label> = <value> assignments.

Example

new_label![Name: &'static str];
new_label![Planets: Vec<&'static str>];
new_label![NumDwarfPlanets: usize]; // currently recognized
new_label![Age: f32]; // in billions of years
new_label![Mass: f32]; // in Solar masses

let solar_system = lhlist![
    Name = "Solar System",
    Planets = vec![
        "Mercury", "Venus", "Earth", "Mars", "Jupiter", "Saturn", "Uranus", "Neptune"
    ],
    NumDwarfPlanets = 5,
    Age = 4.568,
    Mass = 1.0014,
];
assert_eq!(solar_system[Planets][2], "Earth"); // third rock from the sun
assert_eq!(solar_system[Age], 4.568);