Macro stringy::plus_1

macro_rules! plus_1 {
    ($t:tt) => { ... };
    ($a:tt $($bs:tt)+) => { ... };
}

! This library holds macros which can be used to generate enums as labels ! for fixed instances of lazily allocated literal data. ! Macro to generate numbers in constant contexts, e.g., the constant usize bound in the type signature of a fixed size array.

Example

The following illustrates this macro being used to generate a usize constant N equal to the number of token trees provided.

In this case, we know we want it to be three – however, within the context of another macro, we would be able to use this to find a statically known bound for a certain syntactic repetition.

let three_bytes: [u8; plus_1!(a b c)] = [0, 1, 2];

Note that the actual tokens provided are discarded, as each invocation of this macro is syntactically equivalent to a repeated addition of 1.