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method Decoder.readNull

The reader of writeNull(): true (and the value is consumed) when the next value is the null of an absent optional, false (nothing consumed) when a value follows. The default says "never null".

Example:

oxl✓ checked in CI
use std.ser { Codec, Encoder, Decoder, Schema, encode, decode, hex, EncodeError, DecodeError }

fn readMaybe(r: &var Decoder) -> i64? | DecodeError {
  if r.readNull()? { return none }
  r.readI64()?
}
var fn readNull() -> bool | DecodeError

Since. 1.0.0-beta

Returns

bool

Errors

  • DecodeError @error
  • `DecodeError.Malformed` for a damaged value.

Effects

none declared (pure unless the body says otherwise)

Defined in: std/ser/ser.oxl:1837

See also