#include <iostream>
#include <vector>
#include <algorithm>
#include <functional>

using namespace std;
using namespace std::placeholders;

int main()
{
    int m[] = {1, 2, 2, 3, 5, 10};
    vector<int> v;
    v.assign(m, m + sizeof(m) / sizeof(m[0]));

    int target = 3;

    // 使用 std::bind 适配 std::equal_to
    vector<int>::iterator ret = adjacent_find(v.begin(), v.end(), bind(equal_to<int>(), _1, 3));
    cout << *(++ret) << endl;

    if (ret != v.end())
    {
        cout << "Found adjacent elements equal to " << target << "." << endl;
    }
    else
    {
        cout << "No adjacent elements equal to " << target << " found." << endl;
    }
    return 0;
}