/*****************************************************************
Name : 
Date : 2017/04/04
By   : CharlotteHonG
Final: 2017/04/04
*****************************************************************/
#include <iostream>
using namespace std;
 
template<class T, class T2>
auto fun1(T a,  T2 b) -> decltype(a+b){
    return a+b;
}
 
template<class T, class T2>
auto fun2(T a,  T2 b){
    return a+b;
}
 
template<class T, class T2>
decltype(auto) fun3(T a,  T2 b){
    return a+b;
}
 
 
/*==============================================================*/
int main(int argc, char const *argv[]){
    cout << "fun=" << fun1(1, 1.5) << endl;
    cout << "fun=" << fun2(1, 1.5) << endl;
    cout << "fun=" << fun3(1, 1.5) << endl;
 
    return 0;
}
/*==============================================================*/

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