I am writing a lexer in Rust, and I am quite new to how Rust does things in comparison to Java / C++.
I have a function that goes something like:
fn lookup(next_char: &mut char, f: &File) {
//if or match
if next_char == '(' {
//do something
}
}
This gives
error: the trait `core::cmp::PartialEq<char>` is not implemented for the type `&mut char` [E0277]
if next_char == '(' {
^~~~~~~~~~~~~~~~
If they are switched, then it gives a mismatched types error. I understand why it gives these two errors. I was wondering if there was some way to compare the two values. Perhaps I am not thinking in the Rust way or something, but I have not seen a good way to do this in the documentation or elsewhere online.
You just have to dereference to get the char value out of the reference:
if *next_char == '(' {
// ...
}
Collected from the Internet
Please contact [email protected] to delete if infringement.
Comments