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C++ raw pointers and "delete"


By : Tom Lewandowski
Date : September 15 2020, 12:00 AM
it should still fix some issue Yes, you leaked the double originally pointer by pd, but that's not what's causing the error.
The error is a result of you trying to delete a stack allocated address. That is is strictly undefined behavior. delete will only work for pointers which were created with new.
code :


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Why don't RSpec's methods, "get", "post", "put", "delete" work in a controller s


By : user1880584
Date : March 29 2020, 07:55 AM
this will help Because these methods don't belong to Rspec but to Rails.
When you describe a controller, it inherits from Spec::Rails::Example::ControllerExampleGroup, which inherits FunctionalExampleGroup, which inherits the rails' ActionController::TestCase.

C++: Assigning pointers in a class to NULL before calling "delete"


By : AussieDragon
Date : March 29 2020, 07:55 AM
I wish this help you Depends. If the destructor of Node deletes the child nodes, then it is necessary. If it doesn't then that line is not necessary. Yet some tutorials might include it solely in order to promote a good programming style. If you introduce a bug to your program and use the pointer after deleting it, then having a null pointer will give you an error message instead of undefined behavior. You might also want to add the line temp = NULL; if you want to follow this style more rigorously.

Encountered "INSERT" at character 1, but expected: ["DELETE", "SELECT", "UPDATE"


By : Alexandra Mihaela
Date : March 29 2020, 07:55 AM
wish helps you OpenJPA doesn't seem to support JPQL "INSERT" queries. But then that is not surprising since JPA DOES NOT define INSERT queries. It defines SELECT, UPDATE, DELETE queries and that is all. See the JPA spec. This is not SQL.

Angular 2 "Access-Control-Allow-Methods", "GET, POST, OPTIONS, PUT, DELETE" Delete doesn't work


By : Haridas Hirpara
Date : March 29 2020, 07:55 AM
I hope this helps you . The headers need to be added to the response by the server. Adding these headers on the request of the client is entirely pointless. There about 1k such questions. Try searching again and you surely will find something. You need to change the configuration on the server. If you don't control the server, use your own server and forward requests to the 3rd-party server and add the headers when you return the response to the browser.
Günter Zöchbauer

Why do I have to call "delete" twice when I have each two pointers at same memory?


By : user2696658
Date : March 29 2020, 07:55 AM
I wish this helpful for you I allocated the heap memory to a pointer variable 'k' by using new, and copied it in another pointer variable 'd'. ,
When I did delete k, however, the k and d point the memory yet.
code :
delete d;

d = nullptr;
k = nullptr; // Both must be re-assigned

delete k; // Ok, delete on a nullptr is a no-op
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