Boris wrote:
If I instantiate a shared_memory_object with open_or_create how do I know if it was opened or created? I ask as if it was created I need to create a structure in the mapped region. If it was opened though I must not create a structure (as another program created the structure before and I might overwrite data).
I ran into this problem after creating a reader and writer. They exchange data using a shared_memory_object. It would be great if I could start the two programs in any order. But currently the programs don't know which one created and which one opened the shared memory. Do I miss anything or was open_or_create added for another use case?
Boris
Since you must create an object to share between both, use find_or_construct<> on both processes (supposing both have enough information to create the shared structure) before doing anything. If the object is already created, the function will return a pointer to the already created structure. Regards, Ion