Trait DecodeField 

pub trait DecodeField<'a>: Sized {
    // Required method
    fn decode_field(value: Option<&ValueRef<'a>>) -> Result<Self>;
}

Internal/public field decoder used by generated implementations.

Required Methods

fn decode_field(value: Option<&ValueRef<'a>>) -> Result<Self>

Decodes an optional map field into this field type. Returns an error when a required field is absent or has the wrong type.

Examples

use libmaxminddb_rs::{DecodeField, ValueRef};
let value = ValueRef::Utf8("example");
let category = <&str>::decode_field(Some(&value))?;
assert_eq!(category, "example");

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl<'a, T: DecodeField<'a>> DecodeField<'a> for BTreeMap<String, T>

fn decode_field(value: Option<&ValueRef<'a>>) -> Result<Self>

impl<'a, T: DecodeField<'a>> DecodeField<'a> for Option<T>

fn decode_field(value: Option<&ValueRef<'a>>) -> Result<Self>

impl<'a, T: DecodeField<'a>> DecodeField<'a> for Vec<T>

fn decode_field(value: Option<&ValueRef<'a>>) -> Result<Self>

impl<'a> DecodeField<'a> for &'a [u8]

fn decode_field(value: Option<&ValueRef<'a>>) -> Result<Self>

impl<'a> DecodeField<'a> for &'a str

fn decode_field(value: Option<&ValueRef<'a>>) -> Result<Self>

impl<'a> DecodeField<'a> for String

fn decode_field(value: Option<&ValueRef<'a>>) -> Result<Self>

impl<'a> DecodeField<'a> for bool

fn decode_field(value: Option<&ValueRef<'a>>) -> Result<Self>

impl<'a> DecodeField<'a> for f32

fn decode_field(value: Option<&ValueRef<'a>>) -> Result<Self>

impl<'a> DecodeField<'a> for f64

fn decode_field(value: Option<&ValueRef<'a>>) -> Result<Self>

impl<'a> DecodeField<'a> for i32

fn decode_field(value: Option<&ValueRef<'a>>) -> Result<Self>

impl<'a> DecodeField<'a> for u16

fn decode_field(value: Option<&ValueRef<'a>>) -> Result<Self>

impl<'a> DecodeField<'a> for u32

fn decode_field(value: Option<&ValueRef<'a>>) -> Result<Self>

impl<'a> DecodeField<'a> for u64

fn decode_field(value: Option<&ValueRef<'a>>) -> Result<Self>

impl<'a> DecodeField<'a> for u128

fn decode_field(value: Option<&ValueRef<'a>>) -> Result<Self>

Implementors