Subject: [boost] How to get the size of an C-array?
From: vicente.botet (vicente.botet_at_[hidden])
Date: 2009-10-14 12:53:41
Hi,
On TBoost.STM, I need to do something before deleting an array on each one of the elements of the array, or more precissely with the address of each one of the elements.
T* ptr = new T[3];
// in another file, the number of elements to which ptr points is unknown.
// before deleting
for (size_t i=0; i< 'ptr size'; ++i) {
// do something with &ptr[i]
}
delete [] ptr;
As the number of elemenst is unknow in the separated unit, I have no mean to iterate on ptr to get the address of the elements.
The C++ compiler or the C++ standard library knows this number of elements as it needs to call the destructor of each element when deleting the pointer. Is there something in Boost or a portable way to recover the number of elements of the array, maybe overloading the new [] operator and prefixing the allocate storage with some information? But what information can be stored so the implementation is portable?
Any hint is welcome. Best,
_____________________
Vicente Juan Botet Escribá