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Ios swift – Internal Conversion loses integer precision

I installed Firebase with Auth, Firestore, Functions, per pod and I was filled with alerts that I was solving little by little, after that configure and test firebase functions and works fine. The only one I can’t solve is the following:

Implicit conversion loses integer precision: ‘typename std::enable_if<!std::is_same<void, decltype(block())>::value, decltype(block())>::type’ (aka ‘unsigned long’) to ‘int’

Here!

  int LocalStore::Backfill() const {
      return persistence_-> Run("Backfill Indexes", [&] {
        return index_backfiller_->WriteIndexEntries(this);
      });
    }

App and firebase DB seems to work fine but I don’t know what is that and what problem could I have it in the future!

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Any help?

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2

Answers


  1. 0

    Although I do not know the tool you are using, I can read the error message for you and this should help you to answer your question.

    So function int LocalStore::Backfill() const wants to return integer, a signed integer. But is fed with unsigned long by statement:

    persistence_-> Run("Backfill Indexes", [&] {
        return index_backfiller_->WriteIndexEntries(this);
      });

    which returns the type described as

    typename std::enable_if<!std::is_same<void, decltype(block())>::value, decltype(block())>::type

    which turns out to be a (aka 'unsigned long'), so unsigned long.

    So this is now your decision if such implicit casting is OK. I just want to say that this is a messy way of coding to confuse signed and unsigned and integer and long, even if it works.

    IMO you should change Backfill to return unsigned long.

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  2. 0 
    auto LocalStore::Backfill() const {
      return persistence_-> Run("Backfill Indexes", [&] {
        return index_backfiller_->WriteIndexEntries(this);
      });
    }

    return "auto"

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