Can't delete an object (instance of structure with a nested structure)

[wysota]

So, my final conclusion is that in any way deleting an object and inmediatelly create can to have no effect. (I have seen some links about it on the web ). Am I right ?

No, you are wrong.

And I final stupid question, why C++ initialized some vars to max values (in example a int to 65535) ????

C++ doesn't initialize any of your values. They are either random values residing in the chunk of memory where the variable is created or the compiler preinitializes the variables with some known value (often called a "canary") in debug mode. Seeing such value (it's usually multibyte) should make you aware it is related to an uninitialized area of memory.

[tonnot]

Somebody has tell me at other forum ( about deleting)

The OS merely marks the memory block as free - it does not have to do anything else and certainly it does not have to do anything immediately
So if you do what you did, and immediately try to use the object again, you may find valid values.

So, maybe a delete follow by an inmediatelly new can have no effect ?
Thanks WY

[wysota]

What do you mean by "no effect"? If you delete an object then its destructor gets called. Then when you create an object then it may be located in a different or the same address in memory and the constructor gets called. If you access an area of memory where an object once was and nothing overwrites this area in the meantime, you'll be reading values that used to belong to the object. If you mean that you can get the same values after reallocating an object, then yes, you can get the same values. If all memory space is preinitialized with zeroes and you don't initialize any memory yourself then every object will contain only zeroes, with or without deleting anything. But they will certainly be different objects.

Tonnot -- programming is not only about knowing syntax of some programming language. It's also, or rather mainly, the knowledge of how computers work, why they work this way and what "physical" result each statement of your program has. It is obvious you are missing all those skills. Do everyone (yourself included) a favour and read a good book on computers and spend an hour a day on the Web reading and understanding how computers work. And I don't mean asking on forums but reading papers and books on computer science. You will save yourself a lot of time and nerves this way. And investing in a couple of English lessons (especially grammar) would be a good thing to do as well, sometimes it is very hard to understand what you want.