1 | initial version |
Yes, it is possible to create custom literals using Rust macros. Rust macros allow you to define new language constructs or modify existing ones.
For example, to create a custom integer literal that multiplies its value by 2, you can define a macro like this:
macro_rules! double {
($x:expr) => {
$x * 2
};
}
let x = double!(10);
In this example, the double!
macro takes an expression as its argument, and multiplies its value by 2. The resulting value is then assigned to the variable x
.
You can also define custom string literals using macros. For example, to create a custom string literal that converts all its characters to uppercase, you can define a macro like this:
macro_rules! upper {
($s:expr) => {
$s.to_uppercase().to_string()
};
}
let s = upper!("hello");
In this example, the upper!
macro takes a string expression as its argument, converts all its characters to uppercase using the to_uppercase
method of the String
type, and returns the resulting uppercase string.
Overall, Rust macros provide a powerful mechanism for extending the language with custom constructs and literals.