Fix compilation errors with C++20 #2940
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PerThread and Shared in threaded_loop.h now longer use references as data members. This fixes some errors when compiling with C++20 as the minimum standard (due to errors in initialising the variables in the constructors) and also allows us to avoid following the rule of 5 (e.g. no need to define custom copy/move constructors and assignment operators).
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PerThreadandSharedclasses inthreaded_loop.hnow longer use references as data members, but instead they use pointers. This fixes some errors when compiling with C++20 as the minimum standard (due to errors in initialising the variables in the constructors) and also allows us to avoid following the rule of 5 (e.g. no need to define custom copy/move constructors and assignment operators).More generally, I think we should try to avoid using references as data members of classes because they limit the implementation of a class and also slightly hurt readability (for example, it's not obvious when accessing the member that it is a reference).