Macro rhai::reify

macro_rules! reify {
    ($old:ident, |$new:ident : $t:ty| $code:expr, || $fallback:expr) => { ... };
    ($old:expr, |$new:ident : $t:ty| $code:expr, || $fallback:expr) => { ... };
    ($old:ident, |$new:ident : $t:ty| $code:expr) => { ... };
    ($old:expr, |$new:ident : $t:ty| $code:expr) => { ... };
    ($old:ident => Option<$t:ty>) => { ... };
    ($old:expr => Option<$t:ty>) => { ... };
    ($old:ident => $t:ty) => { ... };
    ($old:expr => $t:ty) => { ... };
}

Macro to cast an identifier or expression to another type with type checks.

Runs code if variable or expression is of type type, otherwise run fallback.

Syntax

• reify!(variable or expression,|temp-variable: type| code, || fallback )
• reify!(variable or expression,|temp-variable: type| code )
• reify!(variable or expression => Option<type> )
• reify!(variable or expression => type )