[英]How to iterate through FnvHashMap in Rust
I have two FnvHashMap which is declared like first: FnvHashMap<(i32, i32), Employee> second: FnvHashMap<(i32, i32), Employee> Where Employee is我有两个 FnvHashMap,首先声明如下: FnvHashMap<(i32, i32), Employee> 第二个:FnvHashMap<(i32, i32), Employee> Employee 在哪里
pub struct Employee {
pub emp_id: i32,
pub lang_id: i32,
pub dept_id: f64,
pub description: String,
}
I need to iterate through 'first' FnvHashMap and see if there is a matching record(emp_id and lang_id) in 'second' FnvHashMap我需要遍历“第一个”FnvHashMap 并查看“第二个”FnvHashMap 中是否有匹配的记录(emp_id 和 lang_id)
I may not need to consider dept_id and description我可能不需要考虑 dept_id 和描述
Thanks in Advance.提前致谢。
New code after implementing nested loop实现嵌套循环后的新代码
for (_, employee1) in &first {
for (_, employee2) in &second {
if employee1.emp_id == employee2.emp_id && employee1.lang_id == employee2.lang_id {
values.push(OldNew {
old: employee2,
new: employee1,
});
}
}
}
let new = first
.into_iter()
.filter(|(a, _)| !old.contains_key(a))
.map(|(_, a)| a)
.collect();
let deleted = second
.iter()
.filter(|(a, _)| !new.contains_key(a))
.map(|(&a, _)| a)
.collect();
Changes {
deleted,
new,
values,
}
pub struct Changes<T, I> {
pub deleted: Vec<I>,
pub new: Vec<T>,
pub values: Vec<OldNew<T>>,
}
expected struct `organization::models::employee_stat::Employee`, found `&organization::models::employee_stat::Employee`
Simply make two nested for loops to iterate through both maps and then compare the values you need from the two iterations of the loops, for example只需制作两个嵌套的 for 循环来遍历两个映射,然后比较循环的两次迭代中所需的值,例如
for (_, employee1) in &first {
for (_, employee2) in &second {
if employee1.emp_id == employee2.emp_id && employee1.lang_id == employee2.lang_id {
/* Code here to run if a matching value is found */
}
}
}
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