Core (LV::IntrusivePtr): Implement swap() overload as a friend function. #218
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…on to work with ADL. Overloading std::swap() is considered UB!
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Overloading of functions in
stdnamespace is considered undefined behaviour by the C++ standard.We do the Right Thing by changing
LV::IntrusivePtr'sswap()to a friend function that can be found using argument-dependent lookup.