变量类型编译器占用字节取值范围charx321-128~127（0~255）short（short int）x322-2^15~2^15-1（0~2^16-1）intx324-2^31~2^31-1（0~2^32-1）long（long int）x324-2^31~2^31-1（0~2^32-1）long longx328-2^63~2^63-1（0~2^64-1）floatx324-3.4E-38~3.4E+38doublex328-1.7E-308-1.7E+308指针x324-charx6

#ifndef _THREAD_SAFE_QUEUE_H_#define _THREAD_SAFE_QUEUE_H_#include<queue>#include<memory>#include <boost/thread/thread.hpp>#include<boost/thread/mutex.hpp>#include<boost/thread/condition_varia