这个报错是什么意思

[li4c]

这种报错是什么意思？

/*************************************************************************
    > File Name: t.cpp
    > Author: Jukay
    > Mail: [e-mail] 
    > Created Time: 2014年11月05日 星期三 22时22分26秒
 ************************************************************************/

#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;

vector<int>& function(vector<int> &v1, vector<int> &v2)
{
    vector<int> tmp = v1;
    for(auto a : v2)
	tmp.push_back(a);
    auto iter = unique(tmp.begin(), tmp.end());
    for(; iter != tmp.end(); ++iter)
	v1.erase(iter);
    return v1;
}

int main()
{
    int tmp;
    int m,n;
    vector<int> a;
    vector<int> v1,v2;
    vector<vector<int>> result;
   while(1)
   {
	cin >> n >> m;
	if( n == 0 && m == 0)
	    break;
	for(int i = 0; i< n; ++i)
	{
	    cin >> tmp;
	    v1.push_back(tmp);
	}
	for(int i = 0; i< m; ++i)
	{
	    cin >> tmp;
	    v2.push_back(tmp);
	}
	a = function(v1,v2);
	result.push_back(a);
	v1.clear();
	v2.clear();
    }
   for(auto a : result)
   {
       if(!a.size())
	   cout <<" NULL" << endl;
       else 
       {
	   sort(a.begin(), a.end());
	   for(auto i : a)
	       cout << i << ' ';
	   cout << endl;
       }
   }

   return 0;
}

错误如下

jukay@desktop:~/csdn$ sudo g++ -std=c++11 t.cpp
t.cpp: In function ‘int main()’:
t.cpp:46:6: error: reference to ‘function’ is ambiguous
  a = function(v1,v2);
      ^
t.cpp:13:14: note: candidates are: std::vector<int>& function(std::vector<int>&, std::vector<int>&)
 vector<int>& function(vector<int> &v1, vector<int> &v2)
              ^
In file included from /usr/include/c++/4.8/bits/stl_algo.h:66:0,
                 from /usr/include/c++/4.8/algorithm:62,
                 from t.cpp:10:
/usr/include/c++/4.8/functional:1866:11: note:                 template<class _Signature> class std::function
     class function;
           ^

[brookmill]

引用 楼主 u013163178 的回复:

/usr/include/c++/4.8/functional:1866:11: note: template<class _Signature> class std::function

和std::function的名字冲突了。 把你的function函数随便改个名字就好了。

[勤奋的小游侠]

error: reference to ‘function’ is ambiguous a = function(v1,v2); 把这句翻译一下就知道了。function语义不清，有重名的。