Function libsip::core::extract::extract_opt_param

pub fn extract_opt_param<V: FromStr>(
    params: &mut HashMap<String, Option<String>>, 
    param: &str, 
    extracted_value: &mut Option<V>
)

Extracts a parameter with a given name from parameters if this parameter has any value

Examples

use libsip::core::extract_opt_param;
use std::collections::HashMap;

let mut params = HashMap::new();
params.insert("param1".to_string(), Some("value".to_string()));
params.insert("param2".to_string(), None);

let mut param1: Option<String> = None;
extract_opt_param(&mut params, "param1", &mut param1);
assert_eq!(param1, Some("value".to_string()));
assert_eq!(params.get("param1"), None);

let mut param2: Option<String> = None;
extract_opt_param(&mut params, "param2", &mut param2);
assert_eq!(param2, None);
assert_eq!(params.get("param2"), Some(&None));