C++ string 与 int 等类型 的相互转换

#include <iostream>
#include <sstream>
using namespace std;
// http://www.cnblogs.com/waitingandhoping/p/4604124.html /*

由于stringstream构造、解析函数很耗时，所以尽量只创建一个。
stream.clear(); // 只是重置了stringstream的状态标志，并没有清空数据
stream.str(""); // 清空数据

*/

// 其他类型 -> string
template <class Type>
void TypeTostring(Type TypeTmp, string& strTmp) {
stringstream stream;
stream << TypeTmp;
stream >> strTmp;
stream.clear();
stream.str("");
}

// string -> 为其他类型
template <class Type>
void stringToType(string strTmp, Type& TypeTmp) {
stringstream stream;
stream << strTmp;
stream >> TypeTmp;
stream.clear();
stream.str("");
}

int main() {    // 测试

string strTmp;
int intTmp;
__int64 int64Tmp;
double dbeTmp;

while (true) {
cout << "----- int to string -----" << endl;
cin >> intTmp;
TypeTostring(intTmp, strTmp);
cout << strTmp << endl;
cout << "----- string to int -----" << endl;
cin >> strTmp;
stringToType(strTmp, intTmp);
cout << intTmp  << endl;

cout << "----- double to string -----" << endl;
cin >> dbeTmp;
TypeTostring(dbeTmp, strTmp);
cout << strTmp << endl;
cout << "----- string to double -----" << endl;
cin >> strTmp;
stringToType(strTmp, dbeTmp);
cout << dbeTmp << endl;

cout << "----- int64 to string -----" << endl;
cin >> int64Tmp;
TypeTostring(int64Tmp, strTmp);
cout << strTmp << endl;
cout << "----- string to int64 -----" << endl;
cin >> strTmp;
stringToType(strTmp, int64Tmp);
cout << int64Tmp << endl;
cout << "--------------------------end-------------------------" << endl;
}
return 0;
}