Function serenity::utils::with_cache_mut

pub fn with_cache_mut<T, F>(f: F) -> T where
    F: FnMut(&mut Cache) -> T, 

Like with_cache but as the name says, allows for modifications to be done.

Examples

Return the bot's id, and changes the shard count

use serenity::utils;

// assuming that the id is `1234`:
assert_eq!(1234, utils::with_cache_mut(|cache| { cache.shard_count = 8; cache.user.id }));