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    • François Laignel's avatar
      Query: allow concrete query instantiation · c9717271
      François Laignel authored
      Allow instantiating and dereferencing concrete queries. The motivation
      for this proposal is to allow the following usability enhancements:
      
      - Concrete queries mutability guaranteed by the borrow checker,
      including for generic functions:
      ``` rust
          let mut p = Query::new_position(::Format::Time);
          p.get_mut_structure().set("check_mut", &true);
      ```
      
      - Concrete queries functions available in place:
      ``` rust
          let mut q = gst::Query::new_duration(gst::Format::Time);
          let duration = if pipeline.query(&mut q) {
              Some(q.get_result())
          } else {
              None
          };
      ```
      c9717271