C ++中具有元组的4D映射 [英] 4d mapping in C++ with tuple

问题描述

这有点类似于这个问题 C ++中的4d映射?，也是我以前的问题之一C ++中关于地图的问题使用地图地图名称由字符串C ++定义

This is somewhat similar to this problem 4d mapping in C++? and one of my previous questions on maps in C++ Use a map with the map name defined by a string C++

我有一个看起来像这样的代码(该代码不起作用，停在向地图提供输入的行上):

I have a code that looks like this (that does not work and stops at the line giving input to the map):

#include <iostream>
#include <string>
#include <tuple>
#include <map>
#include <vector>

using namespace std;

int main()
{
    map<string, //Volkswagen (car brand)
        map<string, //series
            map<int, //in this example 1
                tuple<string, string>>>> mapMapMap;

    string myCarmapMapMap = "Volkswagen";
    int Number = 1;

    mapMapMap[myCarmapMapMap]["3 series"][Number] = {90, 20};,

    string Output;
    Output.assign(get<0>(mapMapMap[myCarmapMapMap].find("3 series")->second));
    cout << "\n" << "------------" << "\n" << Output << "\n"<< "------------" << "\n";
}

我想要做的是为大众汽车，三系3系列，一1代号分配两个值，然后可以像这样调用它: Volkswagen->3系列->1->< 0>(值1).

What I want to do is to assign two values to Volkswagen, 3 series, 1 and then be able to call it like: Volkswagen -> 3 series -> 1 -> <0> (value 1).

这是我收到的错误消息: | 19 |错误:，"令牌之前的预期主表达式|

This is the error message I get: |19|error: expected primary-expression before ',' token|

我也尝试过:

mapMapMap.insert({myCarmapMapMap，"3 series"，Number，{"90"，"20"}});

但是它也不起作用.如何将4d地图与元组结合在一起?

But it does not work either. How do I combine a 4d map with a tuple?

推荐答案

更改分配，以便实际上可以形成 tuple< string，string> (请注意右侧的引号):

Change your assignment so it can actually form a tuple<string, string> (note the quotation signs on the right hand side):

mapMapMap[myCarmapMapMap]["3 series"][Number] = {"90", "20"};

示例

此外，删除行末的 .

您的查询很可能可以通过再次包含 Number 来解决，例如:

Your query can, probably, be fixed by including the Number again, like:

string output = get<0>(mapMapMap[myCarmapMapMap].find("3 series")->second[Number]);

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