v1.0.25

• Add the following function with default implementation to the Deserialize trait (thanks @gankro!)

  fn deserialize_in_place<D>(deserializer: D, place: &mut Self) -> Result<(), D::Error>
  where
      D: Deserializer<'de>,
  {
      *place = Deserialize::deserialize(deserializer)?;
      Ok(())
  }

  This is a power user feature that allows deserialization to reuse existing allocations for types like String and Vec. Enable the deserialize_in_place feature of serde_derive to generate these efficient implementations for all types that use #[derive(Deserialize)].

  extern crate serde;
  extern crate serde_json;
  
  use serde::Deserialize;
  
  fn main() {
      let mut v = Vec::<i32>::with_capacity(128);
      assert_eq!(v.capacity(), 128);
  
      let j = "[1, 2, 3]";
      let ref mut de = serde_json::Deserializer::from_str(j);
      Deserialize::deserialize_in_place(de, &mut v).unwrap();
      assert_eq!(v, [1, 2, 3]);
      assert_eq!(v.capacity(), 128);
  }