谈到优化，很多人都会直接想到汇编。难道优化只能在汇编层次吗？当然不是，C++层次一样可以作代码优化，其中有些常常是意想不到的。在C++层次进行优化，比在汇编层次优化具有更好的移植性，应该是优化中的首选做法。-On the optimization, many people will directly think of the compilation. Is optimization only in the compilation of the level of it? Of course not, C++ The same level can be used for code optimization, some of which are often unexpected. In the C++ Levels of optimization, optimization level than in the compilation of better portability, optimization should be the preferred approach.