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Add str_array utility function to runtime primitives #2275

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merged 3 commits into from
Nov 11, 2023
Merged

Add str_array utility function to runtime primitives #2275

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1422641
Add `s` utility function
olanod Nov 10, 2023
f30ba38
Update substrate/primitives/runtime/src/lib.rs
bkchr Nov 11, 2023
671eec1
Update substrate/primitives/runtime/src/lib.rs
ggwpez Nov 11, 2023
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17 changes: 17 additions & 0 deletions substrate/primitives/runtime/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -954,6 +954,23 @@ pub fn print(print: impl traits::Printable) {
print.print();
}

/// Utility function to declare string literals backed by an array of length N.
/// The input can be shorter than N, in that case the end of the array is padded with zeros.
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///
/// [`str_array`] is useful when converting strings that end up in the storage as fixed size arrays
/// or in const contexts where static data types have strings that could also end up in the storage.
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pub const fn str_array<const N: usize>(s: &str) -> [u8; N] {
debug_assert!(s.len() <= N, "String literal doesn't fit in array");
let mut i = 0;
let mut arr = [0; N];
let s = s.as_bytes();
while i < s.len() {
arr[i] = s[i];
i += 1;
}
arr
}

/// Describes on what should happen with a storage transaction.
pub enum TransactionOutcome<R> {
/// Commit the transaction.
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