83 std::ostream &
operator<<(std::ostream &os,
const MemStat& p);
MemStat operator-(const MemStat &right)
std::ostream & operator<<(std::ostream &os, const MemStat &p)
friend std::ostream & operator<<(std::ostream &os, const MemStat &p)
MemStat(const MemStat &right)