編譯器生成的默認構造函數如何比自己編寫的只初始化成員的構造函數更有效? [英]How can a compiler generated default constructor be more efficient than a self-written one that does nothing but initialize members?
`using namespace ...` 會增加編譯時間還是會以某種方式影響性能? [英]Does `using namespace ...` increase compilation time or can it somehow affect performance?