1 unstable release
0.1.0 | Nov 2, 2022 |
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#84 in #nested
7KB
append_to_string rust macro
The append_to_string!() macro appends every occurance of a literal within a struct or on its own with a .to_string(), converting it to a string. The literals type must implement the .to_string() method.
- converting a literal
// str example
let a = "value".to_string();
let b = append_to_string!("value");
assert_eq!(a, b);
// int example
let a = 42.to_string();
let b = append_to_string!(42);
assert_eq!(a, b);
- converting a Struct
// structs
struct A {
s1: String,
s2: String,
}
struct B {
s1: String,
s2: String,
a: A,
}
// simple struct example
let a1 = append_to_string!(
A {
s1: "hello",
s2: "world",
}
);
let a2 = A {
s1: "hello".to_string(),
s2: "world".to_string(),
};
assert_eq!(a1, a2);
// nested struct example
let b1 = append_to_string!(
B {
s1: "hello",
s2: "world",
a: A {
s1: "nested",
s2: "struct",
}
}
);
let b2 = B {
s1: "hello".to_string(),
s2: "world".to_string(),
a: A {
s1: "nested".to_string(),
s2: "struct".to_string(),
}
};
assert_eq!(b1, b2);
May be useful for when you need to create big structs with String fields but want to keep the code readable or save time by not typing out a conversion method for &str types.
dependencies
this crate uses the syn, quote, and proc_macro2 crates.
Dependencies
~1.5MB
~36K SLoC