How to make user defined variables the values in maps

Question

Suppose I create a user defined variable in C++. How can I use that variable as a value in a map?

For example:

std::map<int, mytype> mappa;

If I could get some simple examples, so that I could understand the concept fully, that'd be great.

Answer 1

Here is a small example:

#include <iostream>
#include <map>

class MyClass
{
    // Upto you how your class looks like
};

int main()
{
    // A map where key = int and value = MyClass
    std::map<int, MyClass> myMap;

    // Have some objects of MyClass to demonstrate the use of myMap
    MyClass obj1, obj2, obj3;

    /* Some basic operations */

    // Example of insertion
    myMap.insert({12, obj1});
    myMap.insert({13, obj2});
    myMap.insert({22, obj3});

    // Example of deletion
    myMap.erase(22); // removes myMap[22] i.e. obj3 leaves the map

    // Example of searching
    if (myMap.find(22) != myMap.end())
    {
        // process myMap[22]
        std::cout << "myMap[22] exists";
    }
    else
    {
        std::cout << "myMap[22] does not exist";
    }

    // ...
    return 0;
}

Basically, there's nothing much difficult to use a user-defined type as values in a map. If you meant to use them as keys then you can look at this post.

You can also look at this documentation to learn more of its functions.