包含带有浮点数和另一个整数向量的其他向量的向量

Question

我正在尝试创建一个向量，其中包含带有浮点数和其他整数向量的其他向量。预期结果：

{{5.4 {1, 5, 4, 6, 9},
4.8, {3, 6, 7, 8, 4},
7.3 , {9, 12, 1, 0, 4}}

这是我的尝试之一：

#include <iostream>
#include <vector>


using namespace std;


void _cost(){
    vector<float, vector<int>> result;

    cout<<"This work";
}

int main(){

    _cost();


    return 0;
}

在我所有的尝试中，我收到以下错误：

In file included from /usr/include/c++/7/ext/alloc_traits.h:36:0,
                 from /usr/include/c++/7/bits/basic_string.h:40,
                 from /usr/include/c++/7/string:52,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from prueba_dela_prueba.cpp:1:
/usr/include/c++/7/bits/alloc_traits.h: In instantiation of ‘static void std::allocator_traits<_Alloc>::deallocate(_Alloc&, std::allocator_traits<_Alloc>::pointer, std::allocator_traits<_Alloc>::size_type) [with _Alloc = std::vector<float, std::allocator<int> >; std::allocator_traits<_Alloc>::pointer = float*; std::allocator_traits<_Alloc>::size_type = long unsigned int]’:
/usr/include/c++/7/bits/stl_vector.h:180:19:   required from ‘void std::_Vector_base<_Tp, _Alloc>::_M_deallocate(std::_Vector_base<_Tp, _Alloc>::pointer, std::size_t) [with _Tp = float; _Alloc = std::vector<int>; std::_Vector_base<_Tp, _Alloc>::pointer = float*; std::size_t = long unsigned int]’
/usr/include/c++/7/bits/stl_vector.h:162:22:   required from ‘std::_Vector_base<_Tp, _Alloc>::~_Vector_base() [with _Tp = float; _Alloc = std::vector<int>]’
/usr/include/c++/7/bits/stl_vector.h:263:15:   required from ‘std::vector<_Tp, _Alloc>::vector() [with _Tp = float; _Alloc = std::vector<int>]’
prueba_dela_prueba.cpp:9:32:   required from here
/usr/include/c++/7/bits/alloc_traits.h:328:13: error: ‘class std::vector<float, std::allocator<int> >’ has no member named ‘deallocate’; did you mean ‘_M_deallocate’?
       { __a.deallocate(__p, __n); }
         ~~~~^~~~~~~~~~
         _M_deallocate

我认为，问题是 C++ 不能在内存中分配整数向量，但我不知道为什么......

Answer 1

似乎您想创建一个具有float和 向量的结构向量int；

#include <iostream>
#include <vector>

struct my_data {
    float hoge;
    std::vector<int> fuga;
};

int main() {
    std::vector<my_data> result = {
        {5.4 , {1, 5, 4, 6, 9}},
        {4.8 , {3, 6, 7, 8, 4}},
        {7.3 , {9, 12, 1, 0, 4}}
    };

    for (auto& d : result) {
        std::cout << "[" << d.hoge << "]";
        for (auto& i : d.fuga) {
            std::cout << ", " << i;
        }
        std::cout << std::endl;
    }

    return 0;
}

或成对的向量：

#include <iostream>
#include <vector>
#include <utility>

int main() {
    std::vector<std::pair<float, std::vector<int> > > result = {
        {5.4 , {1, 5, 4, 6, 9}},
        {4.8 , {3, 6, 7, 8, 4}},
        {7.3 , {9, 12, 1, 0, 4}}
    };

    for (auto& d : result) {
        std::cout << "[" << d.first << "]";
        for (auto& i : d.second) {
            std::cout << ", " << i;
        }
        std::cout << std::endl;
    }

    return 0;
}