On 02/11/2017 08:47 AM, alexc via Boost wrote:

followed detail of the case, an object constructor store this pointer to a static variable. could it be a problem?

From a quick look at the code, I do not think that it poses a problem. The idea, as I understand it, is to use RAII to push and pop a "stack frame" (call_stack<T>::context) onto a thread-local static "stack" (call_stack<T>::top_.) The context destructor will remove itself from the "stack".