thibault-cne
/ reverse_polish_notation.rs
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March 19, 2024 23:39
introduction_to_rust_declarative_macros
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| macro_rules! rpn { | |
| { @inner_op stack [$r:expr, $l:expr $(, $stack:expr)*]; $op:tt $($tt:tt)* } => { | |
| rpn! { @inner stack [$l $op $r $(, $stack)*]; $($tt)* } | |
| }; | |
| { @inner stack [$res:expr]; } => { $res }; | |
| { @inner stack $stack:tt; + $($tt:tt)* } => { | |
| rpn!{ @inner_op stack $stack; + $($tt)* } | |
| }; | |
| { @inner stack $stack:tt; - $($tt:tt)* } => { | |
| rpn!{ @inner_op stack $stack; - $($tt)* } |