forked from Orchid/orchid
Lawrence Bethlenfalvy
c461f82de1
New constraint: custom lexer output is dropped whenever it is used to terminate an operator nested inside another custom lexer, because the recursive call has to return exactly one lexeme
24 lines
514 B
Rust
24 lines
514 B
Rust
#[macro_export]
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macro_rules! tl_cache {
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($ty:ty : $expr:expr) => {{
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thread_local! {
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static V: $ty = $expr;
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}
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V.with(|v| v.clone())
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}};
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(async $ty:ty : $expr:expr) => {{
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type CellType = std::cell::OnceCell<$ty>;
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thread_local! {
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static V: CellType = std::cell::OnceCell::default();
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}
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match V.with(|cell: &CellType| cell.get().cloned()) {
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Some(val) => val as $ty,
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None => {
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let val = $expr;
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let _ = V.with(|cell: &CellType| cell.set(val.clone()));
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val as $ty
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},
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}
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}};
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}
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