c – 如何使用std :: ref？

#include <vector>
#include <algorithm>
#include <iostream>
#include <functional>
using namespace std;
struct IsEven
{
    bool operator()(int n) 
    {
        if(n % 2 == 0)
        {
            evens.push_back(n);
            return false;
        }

        return true;
    }

    vector<int> evens;
};
int main(int argc,char **argv)
{
    vector<int> v;
    for(int i = 0; i < 10; ++i)
    {
        v.push_back(i);
    }

    IsEven f;
    vector<int>::iterator newEnd = remove_if(v.begin(),v.end(),std::ref(f));
    return 0;
}

错误：

c:program files (x86)microsoft visual studio
10.0vcincludexxresult(28): error C2903: ‘result’ : symbol is neither a class template nor a function template

c:program files (x86)microsoft visual studio
10.0vcincludexxresult(28): error C2143: syntax error : missing ‘;’ before ‘<‘

再加一些…