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In what state should my overridden >> operator leave my object when the input stream contains invalid data?


By : user3852036
Date : October 15 2020, 01:20 AM
this will help Say I have overridden the >> operator for a class like below: , The way that most code that performs stream I/O is written is:
code :


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Does moving leave the object in a usable state?


By : sk2014
Date : March 29 2020, 07:55 AM
it should still fix some issue From n3290, 17.6.5.15 Moved-from state of library types [lib.types.movedfrom]
Objects of types defined in the C++ standard library may be moved from (12.8). Move operations may be explicitly specified or implicitly generated. Unless otherwise specified, such moved-from objects shall be placed in a valid but unspecified state.

Can the global new operator be overridden based on allocated object's type traits?


By : Lethai Son
Date : March 29 2020, 07:55 AM
hop of those help? The short answer is no. The allocation/deallocation functions have the following signatures:
code :
void* operator new(std::size_t);
void* operator new[](std::size_t);
void operator delete(void*);
void operator delete[](void*);

You may have returned undefined, an array or some other invalid object rendering state data


By : Anderson
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , what you can do is extract your js code from the render method in a separate method like so:
code :
renderList() {
   return this.state.myData.map((item) => {
      <div>
       <h3>{item.title}</h3>
       <p>{item.description}</p>
      </div>
   })
}
render() {
  if(this.state.myData.length){
    return (
       <div>{this.renderList()}</div>
    );
  }
  else
  {
    return (
      <div>Loading...</div>
    );
  }
}

laravel migrations leave DB in an invalid state


By : Irfan Purnama
Date : March 29 2020, 07:55 AM
it should still fix some issue If a migration fails half way through for any reason (E.g. typo), it commits half the migration, and leaves the rest out. It doesn't seem to try to roll back what it just did.(either by rolling back an encompassing transaction, or calling down()) , You should run these migrations inside a transaction:
code :
DB::transaction(function () {
    // Your code goes here.
}
try {
    DB::beginTransaction();

     // Your code goes here ...

    DB::commit();
} catch(\Exception $e) {
    DB::rollBack();
}

Set stream state to communicate error in formatted output operator (operator<<)


By : Status XYZ
Date : March 29 2020, 07:55 AM
Hope that helps Just summarizing my conclusions from comments (thanks to Some programmer dude for the input)...
You are mixing two concerns that you better keep seperated:
code :
 os << "1";
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