Function der_parser::ber::parse_ber_explicit_optional

pub fn parse_ber_explicit_optional<F>(
    i: &[u8],
    tag: BerTag,
    f: F
) -> BerResult<'_>where
    F: Fn(&[u8]) -> BerResult<'_>,

Parse an optional tagged object, applying function to get content

This function returns a BerObject, trying to read content as generic BER objects. If parsing failed, return an optional object containing None.

This function will never fail: if parsing content failed, the BER value Optional(None) is returned.