#pragma指令的用法总结。#pragma指令对每个编译器给出了一个方法,在保持与C和 C++语言完全兼容的情况下,给出主机或操作系统专有的特征。-# pragma directive usage summary.# pragma directive is given for each compiler a way to maintain the C and C++ language is fully compatible with the given host or operating system-specific characteristics.