字符串数值互转

// 王智泉 2012/06/13#ifndef __StringHelper__H__#define __StringHelper__H__#include <string>#include <sstream>#define iToStdS(v) ValueToString<int>(v).str()#define fToStdS(v) ValueToString<float>(v).str()#define dToStdS(v) ValueToString<double>(v).str()#define StdSToI(v) StringToValue<int>(v).value()#define StdSToF(v) StringToValue<float>(v).value()#define StdSToD(v) StringToValue<double>(v).value()// 数值转字符串template<typename T>class ValueToString{public:ValueToString(T v){std::stringstream strem;strem << v;_str = strem.str();}std::string& str()  { return _str; }private:std::string _str;};// 字符串转数值template<typename T>class StringToValue{public:StringToValue(const std::string& s){std::stringstream strem(s);strem >> _val;}T value(){return _val;}private:T _val;};#endif