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並前往https://www.inf.pucrs.br/~flash/lapro2ec/cppreference/w/cpp/memory/shared_ptr/owner_before.html

std::shared_ptr::owner_before - Cppreference

... struct B2 { int n2;}; struct D : B1, B2 {}; int main() { auto p1 = std::make_shared<D>(); std::shared_ptr<void> p2 = std::static_pointer_cast<B2>(p1); ...

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