利用stringstream实现常用的类型转换

Posted 2021-02-21 cyssmile

其他类型转成string

template <class T>
void toString(string& result,const T &t)
{
    //将各种数值转换成字符串
    ostringstream oss;
    oss.clear();
    oss << t;
    result.clear();
    result = oss.str();
}

string转成其他类型

template <class T>
void stringToOther(T &t, const string &s)
{
    stringstream ss;
    ss.clear();
    ss << s;
    ss >> t;
}

类型之间的相互转换

template <class inputType,class outputType>
void toConvert(const inputType &input, outputType &output){

    stringstream ss;
    ss.clear();
    ss << input;
    ss >> output;
}

完整代码

#include <sstream>
#include <iostream>
#include <string>
using namespace std;

template <class T>
void toString(string& result,const T& t);
template <class T>
void stringToOther(T &t, const string &s);
template <class inputType,class outputType>
void toConvert(const inputType &input, outputType &output);

int main(int argc, char** argv)
{
    string s1;
    double a =1.1111;
    toString(s1,a);
    cout<<s1<<endl;
    double b = 0;
    double &bptr =b;
    stringToOther(bptr,s1);
    cout<<bptr<<endl;

    string s2 ="2.222";
    double c1 =0;
    double &c1ptr = c1;
    toConvert(s2,c1ptr);
    cout<<c1ptr<<endl;

    return 0;
}

template <class T>
void toString(string& result,const T &t)
{
    //将各种数值转换成字符串
    ostringstream oss;
    oss.clear();
    oss << t;
    result.clear();
    result = oss.str();
}

template <class T>
void stringToOther(T &t, const string &s)
{
    stringstream ss;
    ss.clear();
    ss << s;
    ss >> t;
}

template <class inputType,class outputType>
void toConvert(const inputType &input, outputType &output){

    stringstream ss;
    ss.clear();
    ss << input;
    ss >> output;
}