On 09/21/07 04:14, Achilleas Margaritis wrote:
O/H Kim Barrett έγραψε:
At 2:06 AM +0300 9/21/07, Achilleas Margaritis wrote:
I thought std containers use the allocator::pointer type for their pointers. Unfortunately, not necessarily. They're permitted to bypass that and use T* directly. Ion Gaztañaga ran into this when trying to put containers into shared memory for boost.interprocess.
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The collector offers the possibility of customizing the scanning procedure (the procedure which scans a block for pointers) through the class gc_traits<T>. So if there is a data structure where gc_ptr<T> can not be used, a custom scan routine especially coded for the data structure in question can solve the problem.
Given the following: std::list<gc_ptr<Node> > node_list; where Node is defined in cppgc/src/main.cpp, then no gc_ptr's within node_list would be registered as root pointers; so, wouldn't any Nodes of the gc_ptr's pushed into node_list be collected? I guess I don't understand how a customized scanner would help. Sure, once it's known that node_list contains gc_ptr's, the scanner could be called, but the collector first needs to be notified of that fact. Am I missing something.