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I am learning about class in C++. I came to know that in certain situations the default constructor can be implicitly deleted. Also, i read that when we have a user defined constructor then the compiler will not automatically synthesize the default constructor.

To my current understanding, an implicitly deleted default constructor is quite different from the situation when the default constructor is not automatically synthesized. I mean in both cases we have the same effect, which is that we cannot create an object using default initialization. But still an implicitly deleted default constructor is not the same as compiler not synthesizing the default constructor.

But then i came across this answer which says:

when you explicitly declare any constructors, the default constructor is implicitly deleted.

(end of quote)

As i said, i don't think that when we have user defined constructors in our class then the default constructor is implicitly deleted. Instead the default constructor is not automatically synthesized by the compiler which is different(IMO) from being implicitly deleted. So the quoted answer seems technically wrong to me. And so the quoted answer should instead say that when we have user defined constructors then the compiler will not automatically synthesize the default ctor for us. But many people have upvoted(+marked it as correct) that answer so i may be missing something. Please correct me where i am wrong in my understanding of the topic and also tell me whether or not the quoted answer is technically correct.

My point is that "having an implicitly deleted default ctor" and "the compiler not synthesizing a default ctor due to the presence of user defined constructor" are 2 different things.

I am working on a Christian app, all is going well, except for 1 thing: I can't solve how to get the label to update its text after my AVSpeechSynthesizer has finished speaking.

For example, after the prayer has finished being read, the text should update to "Play" again. It does this correctly in all other known scenarios (Pause works, Resume works, stop works, restart works, etc. as in the label updates accordingly).

Please see my code here:

I have this Swift class, the function emitLogEvent calls RCTEventEmitter sendEvent which is being listened for in React Native. If I call this function directly from React, the sendEvent works and I can log out count from React Native.

I'm struggling to debug a NextJS API that is working in development (via localhost) but is silently failing in production.

Below, the two console.log statements are not returning, so I suspect that the textToSpeech call is not executing correctly, potentially in time?

I'm not sure how to rectify, happy to debug as directed to resolve this!

I'm a c++ beginner and now reading the C++ Primer. I have some problem about the destrucor:

1. in chapter 13.1.3: "In a destructor, there is nothing akin to the constructor initializer list to control how members are destroyed; the destruction part is implicit. What happens when a member is destroyed depends on the type of the member. Members of class type are destroyed by running the member’s own destructor. The built-in types do not have destructors, so nothing is done to destroy members of built-in type."

   So if I have such a class:

In the sample program below,

Why is the output different for static & automatic variable of user defined class type ?

I am trying to create a base record type which will use a different implementation of Equals() for value equality, in that it will compare collection objects using SequenceEqual(), rather than comparing them by reference.

However, the implementation of Equals() doesn't work as I'd expect with inheritance.

In the example below, I have got a derived class which has two different lists. Under the default implementation of equality, these records are different because it is comparing the lists by reference equality, not by sequence equality.

If I override the default implementation of Equals() on the base record to always return true, the unit test will fail, even though the code is calling RecordBase.Equals(RecordBase obj).

I started with this type for leaf-valued trees with labeled nodes:

I use firebase's Realtime Database to make asynchronous database queries from my app. Now that iOS 15 gives us Swift 5.5, I'd love to use async/await to perform those queries instead of passing completion closures.

I know that I can use await withCheckedThrowingContinuation { } to build async versions from the existing firebase functions. But do async versions already exist? Either in firebase or auto-synthesized by Xcode?