Function deserialize_option_u64 

pub fn deserialize_option_u64<'de, D>(
    deserializer: D,
) -> Result<Option<u64>, D::Error>
where
    D: Deserializer<'de>,

See deserialize_u64.

Example:

use serde::Deserialize;
use serde_json::{Error, from_str};

use deserialize_custom_strings::deserialize_option_u64;

#[derive(Deserialize)]
struct Foo {
  #[serde(deserialize_with = "deserialize_option_u64")]
  definetly_a_option_u64: Option<u64>,
}

let json = r#"{
  "definetly_a_option_u64": "0123456789"
}"#;

let foo: Result<Foo, Error> = from_str(json);

assert!(foo.is_ok());
assert_eq!(foo.unwrap().definetly_a_option_u64, Some(123456789));

let json = r#"{
  "definetly_a_option_u64": null
}"#;

let foo: Result<Foo, Error> = from_str(json);

assert!(foo.is_ok());
assert_eq!(foo.unwrap().definetly_a_option_u64, None);

let json = r#"{
  "definetly_a_option_u64": -123456789
}"#;

let foo: Result<Foo, Error> = from_str(json);

assert!(foo.is_err());