weak_ptr 的自定义分配器

Question

From high CPU usage in RtlpLowFragHeapAllocFromContext() I am making a guess that std::weak_ptr() that I use frequently (calling .lock() on it) should be the culprit that doesn't use the internal efficient memory pool, but rather resorts to malloc() / free() / new / delete guys.

Is there a way to specify custom allocator for an std::weak_ptr ? If yes, how? If no, why?

UPDATE: uploading the profiler snapshot

Answer 1

weak_ptr does not allocate memory, nor do any of its operations (which are all noexcept ). It does its job based on allocations which are part of any shared_ptr 's control block. You can customize shared_ptr 's control block allocation behavior, but that's got nothing to do with weak_ptr itself.