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macro rules variable rust

T-DaMER answered on December 30, 2022 Popularity 6/10 Helpfulness 5/10

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macro rules variable rust

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// This is a simple macro named `say_hello`.
macro_rules! say_hello {
    // `()` indicates that the macro takes no argument.
    () => {
        // The macro will expand into the contents of this block.
        println!("Hello!");
    };
}

fn main() {
    // This call will expand into `println!("Hello");`
    say_hello!()
}

Popularity 6/10 Helpfulness 5/10 Language rust

Source: Grepper

Tags: macro-rules rust

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Contributed on Dec 30 2022

T-DaMER

0 Answers Avg Quality 2/10

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macro rules variable rust

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macro_rules! create_function {
    // This macro takes an argument of designator `ident` and
    // creates a function named `$func_name`.
    // The `ident` designator is used for variable/function names.
    ($func_name:ident) => {
        fn $func_name() {
            // The `stringify!` macro converts an `ident` into a string.
            println!("You called {:?}()",
                     stringify!($func_name));
        }
    };
}

// Create functions named `foo` and `bar` with the above macro.
create_function!(foo);
create_function!(bar);

Popularity 6/10 Helpfulness 6/10 Language rust

Source: Grepper

Tags: rust macro-rules

Link to this answer
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Contributed on Dec 30 2022

T-DaMER

0 Answers Avg Quality 2/10

macro rules variable rust

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