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  1. C Driver
  2. CDRIVER-2829

Add a bson_copy_to_excluding_noinit variant taking a va_list

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    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Minor - P4
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 1.14.0
    • Component/s: libbson
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      Description

      SWIFT-195 introduced a variety of methods for transforming documents: taking a prefix, suffix, subsequence, etc. 

      Ideally, we would implement these using bson_copy_to_excluding_nonit, to avoid having to round-trip the values we want do to keep through Swift when we put them into a new document. 

      However, Swift by design does not allow calling variadic C functions, as discussed in the documentation here. It does, however, support calling functions that take a va_list.

      There is currently _bson_copy_to_excluding_va, but it's internal. 

      Access to a variant of this method that lets us use a va_list to specify the fields to exclude would make these methods introduced in SWIFT-195 far more performant.

       

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