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/* container_of, inspired by AndrewTsao */
template <class T, typename M>
constexpr T* container_of(M *m, const M T::*p) noexcept {
return reinterpret_cast<T*>(reinterpret_cast<char*>(m)
- reinterpret_cast<const ptrdiff_t>(
&(static_cast<const T *>(nullptr)->*p)));
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