fmap.cpp

//
// Created by light on 20-1-5.
//

#include <iostream>
#include <vector>

using namespace std;


template<
        template<typename, typename>
        class OutContainer = vector,
        typename F, class R>
auto fmap(F &&f, R &&inputs) {
    typedef decay_t<decltype(f(*inputs.begin()))> result_type;

    OutContainer<result_type, allocator<result_type >> result;

    for (auto &&item:inputs) {
        result.push_back(f(item));
    }
    return result;
}

// 对每一个数进行加1操作
int add_1(int x) {
    return x + 1;
}

int main() {
    vector<int> v{1, 2, 3, 4, 5};
    auto result = fmap(add_1, v);

    for (auto item:result)
        cout << item << " ";
    cout<<endl;
    return 0;
}