While in the currect Standard it's 'void', check your implementation for it as a possible extension. Sign up using Email and Password. If you're newing a lot of similar objects then you need to keep them somewhere. Visit chat. This way, if code that accesses the global variable is compilable, it means that it will behave as expected at run-time. This might get a bit out of the scope of this thread, but let's do it anyways: A. No, the objects referred to by the pointers in your map will not be deleted. Is there any function that allows me to completely remove and deallocate all contents of a std::map? Nick Keighley.
No it doesn't free the memory if it is a naked pointer. When you erase from a map, it only removes the element. This article deals with the deletion part of Maps. Using erase(): erase() is used to erase the pair in map mentioned in argument, either its position, its value or a. map::erase() is a built-in function in C++ STL which is used to erase element from the container. It can be used to erase keys, elements at any specified position.
If a variable is global it should be valid at all times, not just during a local scope even if that local scope is the main function.
This can tremendously increase the effectiveness of the programming.
Doese erase() free the memory C++ Forum
The instantiator generates many objects of various classes derived from Type. This piece of code basically creates a global alias for a local variable. However, I don't agree that "the code will fail in an obvious way under testing" is a good thing. Real answer: Use valgrind. You could add some bureaucracy around the variable but it won't give you any substantial benefit.
delete ap. It doesn't free any memory as far as I know, is what I meant to say. typedef std::mapstd::string, const T*Table; void destroy_map () Does the erase() invalidate the iterator? This was the code I found free the memory pointed by the elements and then just clear() the map, given that you are.
I have a map in which my value is dynamically allocated.
That's just my opinion. Take a deep breath and you will realize how silly it is to imply that initialize-on-first-use is "complicated and obtuse". I suppose the assignment could throw inside the destructor. They will destroy the objects you put into them. Custom Filters release announcement. Checking pointers for null values all the time if they're never supposed to be null is a cargo-cult form of robustness.
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|Thanks for the explanation. And that's your answer. To me, all of the above, together, are enough to merit the name "dirty hack". Now, if you want to specify the log-file at startup, then that's trivial. STL containers won't manage your memory, so ensure you do it.
Other references and iterators are not affected.
Video: Std map erase free memory Learn STL: Removing Elements 1
The iterator pos must be valid. Does std::() properly delete pointers, or does it create memory leaks? Q2. Without knowing if erase() removes pointers properly or.
At the same time, you need the variable to be global, because passing it as a parameter to everything is insane. Thanks for pointing it out, I fixed this. Now, if you want to specify the log-file at startup, then that's trivial.
c++ map erase() Stack Overflow
Also, if you have to initialize a logger in the main function anyway, we're talking about a more obscure kind of failure if you forget to do that than one which crashes immediately. Global scope means the variable's lifetime is that of the application, right?