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"Destructor already defined" with a specialized destructor

By : Brandan Schmitz
Date : October 17 2020, 03:08 PM
may help you . Chances are your Cat.cpp and main.cpp translation units both include the same Cat.h header file. Put your entire template class in a header file, remove the Cat.cpp translation unit and compile without it.
Live example
code :

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Need to be sure constructor/destructor are called once. But "error: destructor is private"

By : Sevilay Erorhan
Date : March 29 2020, 07:55 AM
it fixes the issue I have the following code , Better use this method of singleton constructor:
code :
static A* getA(){
    static A singleton;
    std::cout << "singleton got" << std::endl;
    return &singleton;

Rule "A user-defined but do-nothing destructor is also a non-trivial destructor" is too strict?

By : user2218519
Date : March 29 2020, 07:55 AM
Hope that helps Having the rule absolutely prohibit a definition gives a meaning to providing an empty one: it specifies that its instances must not be forgotten in an array that provides their storage. What the destructor does, if anything, can be considered an implementation detail that might change in future versions. It also avoids a change in meaning based on whether the “empty” destructor is defined in the class definition; if it isn’t, it can even be binary-compatible to change it to do something.

Why is a "=default" destructor different than the implicitly declared destructor?

By : GRC
Date : March 29 2020, 07:55 AM
I wish this helpful for you The implicitly-defined move constructor for B only gets created if
there are no user-declared copy constructors; there are no user-declared copy assignment operators; there are no user-declared move assignment operators; there are no user-declared destructors;

Is it necessary to call a destructor for "string" members within the object destructor?

By : Juhar Ousman
Date : March 29 2020, 07:55 AM
To fix the issue you can do No, you don't need. (And you must not !)
You are only responsible for the memory you have allocated with new, only then should you use delete.

"Missing vtable" for destructor, but destructor is defined

By : Andrew Yang
Date : March 29 2020, 07:55 AM
wish help you to fix your issue I have a class: , The problem is exactly what the error message says:
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