Memory manager and class constructors!
Author
Hello!
i want to create a realy simple memory manager.
simply just a wrapper for new and delete with some
ekstra stuff... (logging, garbage...)
Now this is my problem:
if i write:
MyClass *class = new MyClass();
delete class;
both the constructor and destructor of MyClass will be called...
if i instead write:
MyClass *class = MyNew(size);
where MyNew only returns a pointer to some free mem i
allocated at startup, the
constructor will not be called... how could i solve this?
(without advanced templates... an ekstra variable is ok...)
-anders
Quote:Original post by uncutno
constructor will not be called... how could i solve this?
(without advanced templates... an ekstra variable is ok...)
you can use placement new to initialize uninitialized memory e.g.
#include <new>/*....*/MyClass *class = MyNew(size);class = new(class) Myclass;you need to include header new.
Quote:Original post by elementary
Which should also be followed by an explicit call to its destructor
class->~MyClass();
and then deallocate the memory, if you wont to get picky about it [smile]
Author
thanks!!
Is there a way do do this inside MyNew and MyDelete? Calling the constructor without the class definition? (sound like it should be illegal)
can this be solved with a templated function in a class? it should be possible, but is this the right way to do it?
im thinking about a mem manager where all memory is allocated at start, and deleted at the end... will fitt perfectly with my sort of paging world data mem system...
Is there a way do do this inside MyNew and MyDelete? Calling the constructor without the class definition? (sound like it should be illegal)
can this be solved with a templated function in a class? it should be possible, but is this the right way to do it?
im thinking about a mem manager where all memory is allocated at start, and deleted at the end... will fitt perfectly with my sort of paging world data mem system...
With templates, yes.
roughly the same idea with MyDelete.
template<typename T>T* MyNew(std::size_t size) { //allocate new (mem) T();}roughly the same idea with MyDelete.
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