47 lines
2.6 KiB
Rust
47 lines
2.6 KiB
Rust
// Shamelessly taken from
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// https://stackoverflow.com/questions/36258417/using-a-macro-to-initialize-a-big-array-of-non-copy-elements
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// Allows us to fill an array with a predefined value.
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#[macro_export]
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macro_rules! filled_array {
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(@accum (0, $($_es:expr),*) -> ($($body:tt)*))
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=> {filled_array!(@as_expr [$($body)*])};
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(@accum (1, $($es:expr),*) -> ($($body:tt)*))
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=> {filled_array!(@accum (0, $($es),*) -> ($($body)* $($es,)*))};
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(@accum (2, $($es:expr),*) -> ($($body:tt)*))
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=> {filled_array!(@accum (0, $($es),*) -> ($($body)* $($es,)* $($es,)*))};
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(@accum (3, $($es:expr),*) -> ($($body:tt)*))
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=> {filled_array!(@accum (2, $($es),*) -> ($($body)* $($es,)*))};
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(@accum (4, $($es:expr),*) -> ($($body:tt)*))
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=> {filled_array!(@accum (2, $($es,)* $($es),*) -> ($($body)*))};
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(@accum (5, $($es:expr),*) -> ($($body:tt)*))
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=> {filled_array!(@accum (4, $($es),*) -> ($($body)* $($es,)*))};
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(@accum (6, $($es:expr),*) -> ($($body:tt)*))
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=> {filled_array!(@accum (4, $($es),*) -> ($($body)* $($es,)* $($es,)*))};
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(@accum (7, $($es:expr),*) -> ($($body:tt)*))
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=> {filled_array!(@accum (4, $($es),*) -> ($($body)* $($es,)* $($es,)* $($es,)*))};
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(@accum (8, $($es:expr),*) -> ($($body:tt)*))
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=> {filled_array!(@accum (4, $($es,)* $($es),*) -> ($($body)*))};
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(@accum (16, $($es:expr),*) -> ($($body:tt)*))
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=> {filled_array!(@accum (8, $($es,)* $($es),*) -> ($($body)*))};
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(@accum (32, $($es:expr),*) -> ($($body:tt)*))
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=> {filled_array!(@accum (16, $($es,)* $($es),*) -> ($($body)*))};
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(@accum (64, $($es:expr),*) -> ($($body:tt)*))
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=> {filled_array!(@accum (32, $($es,)* $($es),*) -> ($($body)*))};
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(@accum (128, $($es:expr),*) -> ($($body:tt)*))
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=> {filled_array!(@accum (64, $($es,)* $($es),*) -> ($($body)*))};
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(@accum (256, $($es:expr),*) -> ($($body:tt)*))
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=> {filled_array!(@accum (128, $($es,)* $($es),*) -> ($($body)*))};
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(@accum (512, $($es:expr),*) -> ($($body:tt)*))
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=> {filled_array!(@accum (256, $($es,)* $($es),*) -> ($($body)*))};
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(@accum (1024, $($es:expr),*) -> ($($body:tt)*))
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=> {filled_array!(@accum (512, $($es,)* $($es),*) -> ($($body)*))};
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(@accum (2048, $($es:expr),*) -> ($($body:tt)*))
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=> {filled_array!(@accum (1024, $($es,)* $($es),*) -> ($($body)*))};
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(@accum (4096, $($es:expr),*) -> ($($body:tt)*))
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=> {filled_array!(@accum (2048, $($es,)* $($es),*) -> ($($body)*))};
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(@as_expr $e:expr) => {$e};
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[$e:expr; $n:tt] => { filled_array!(@accum ($n, $e) -> ()) };
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}
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