Questions tagged [macro-rules]
20 questions
0
votes
1 answer
How to parse nested optional tokens in macro_rules?
When trying to do
macro_rules! tipey {
(Vec<$pt: tt>) => { 2 };
(Vec>) => { 3 };
($pt: tt) => { 1 };
}
macro_rules! structy {
(struct $i: ident {
$($p: ident: $pt: tt $(<$ppt: tt $(<$gt: tt> )? > )?),+
…
ditoslav
- 4,563
- 10
- 47
- 79
0
votes
1 answer
How to match a struct instantiation with macro_rules
Since this took me a while to figure out, I may as well share how I fixed it.
I was trying to wrap every item on a struct with some function, in my case Arc::new(Mutex::new(item)) with macro_rules
My initial attempt was many variations on…
Luctins
- 77
- 1
- 6
0
votes
1 answer
Macros, How to generate enum variant from str literal?
I have an enum with over 100 variants. and I have to get each of its variants from a string. Something like this.
enum VeryLongEnum {
A,
B,
C,
D,
E,
}
impl From<&'static str > for VeryLongEnum {
fn from(s: &'static str) ->…
al3x
- 589
- 1
- 4
- 16
0
votes
2 answers
Macro that implements functions based on type
How can I write a macro that implements the same methods for multiple structs? The methods should be slightly different based on the struct.
The code should look something like this:
macro_rules! say_name {
(for $($t:ty),+) => {
$(impl…
Jad Haddad
- 71
- 7
0
votes
1 answer
Rust macro to format arguments over multiple formats
TL;DR
I'm trying to write a macro that will do the following transformation:
magic_formatter!(["_{}", "{}_", "_{}_"], "foo") ==
[format!("_{}", "foo"),
format!("{}_", "foo"),
format!("_{}_", "foo")]
(a solution that will give…
NivPgir
- 63
- 4