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what is actual difference between or operator and in operator in sql


By : Paul
Date : September 16 2020, 10:00 AM
will be helpful for those in need When I am using OR operator it shows those values which are used in OR operater after where clause IN also do the same. , The IN operator can be rewritten into a series of OR conditions:
code :
where some_column IN (1,2,3) 
where some_column = 1 
   or some_column = 2 
   or some_column = 3
where col_1 = 1 
   or col_2 = current_date
   or col_3 = 'some value'


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difference between the dot operator and arrow operator by structure object variable for tree creation in c or c++


By : TMatt
Date : March 29 2020, 07:55 AM
I hope this helps you . The . operator expects its operand to be an expression of type struct ... or union .... The -> operator expects its operand to be an expression of type "pointer to struct ..." or "pointer to union ...".
The expression tree has type "pointer to struct Huffman", so you use the -> operator to access a member.

What is the difference between explicit atomic load/store and usual operator= and operator T?


By : user2391903
Date : March 29 2020, 07:55 AM
like below fixes the issue Those two examples are equivalent; operator= and operator T are defined to be equivalent to calling store and load respectively, with the default value for the memory_order argument.
If you're happy with that default value, memory_order_seq_cst, so that each access acts as a memory fence, then use whichever looks nicer to you. If you want to specify a different value, then you'll need to use the functions, since the operators can't accept a second argument.

How do 'operator' functions work when they're defined in terms of a class rather than an actual operator?


By : Azul
Date : March 29 2020, 07:55 AM
hop of those help? Re: "we're overloading an actual class". No. operator A() { return a; } is overloading an operator; note the keyword operator. This defines a conversion operator that will be used when the code calls for a conversion from an object of type B to an object of type A.
The use in your example is a bit obscure. Here's an easier example:
code :
B b;
A obj = b;
A obj = A::build();

Writing tests for RxJS that uses retryWhen operator (understanding difference from retry operator)


By : user3591999
Date : March 29 2020, 07:55 AM
I wish this help you You can use retryWhen for those two purposes, one to have your logic in it and the second is the retry numbers you'd like to give it (no need to use retry operator):
code :
// some API I'm using and mocking out in test
import { geoApi } from "api/observable";

export default function retryEpic(actions$) {
  return actions$.pipe(
    filter(action => action === 'A'),
    switchMap(action => {
      return of(action).pipe(
        mergeMap(() => geoApi.ipLocation$()),
        map(data => ({ data })),
        retryWhen(errors =>
          errors.pipe(
            mergeMap((error, i) => {
              if (i === 2) {
                throw Error();
              }
              // return your condition code
            })
          )
        )
      )
    }),
  );
}

Overloading placement new operator with data member initialization and difference with normal new operator


By : Alexandre Clement
Date : March 29 2020, 07:55 AM
it fixes the issue
So how the compiler differentiates between overloaded placement new and operator new?
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