invocation_wrapper: support non-POD types using placement new #115
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Each context maintains a pool of manually allocated invocation_wrapper
objects, which so far contained only POD types. To support the use of
non-POD types, e.g., std::vector, explicitly invoke the constructor
using placement new after malloc, and the destructor before free.
https://en.cppreference.com/w/cpp/language/new#Placement_new
#103 (comment)