How to create an Empty Map in C++ - Step by Step Examples

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How to create an Empty Map in C++ ?

Answer

To create an empty map in C++, you can declare an empty std::map container. This creates a new, empty map object.

✐ Examples

1 Creating an Empty Map

We can create an empty map in C++ using the std::map constructor, which initializes a map with no key-value pairs.

For example,

We start by including the <map> header file, which provides the necessary functions and data structures for working with maps.
We then declare a variable named emptyMap of type std::map. This variable will hold our empty map.
We use the std::map constructor to create a new, empty map object. In C++, the std::map constructor initializes the map with no key-value pairs.
The newly created map is now assigned to the emptyMap variable. In this example, the map has integer keys and string values.
We can now perform various operations on this empty map, such as adding key-value pairs, checking for the presence of keys, and retrieving values.

C++ Program

#include <map>
#include <iostream>

int main() {
    // Declare an empty map
    std::map<int, std::string> emptyMap;

    // Operations on the empty map
    // ...

    std::cout << "Map size: " << emptyMap.size() << std::endl;
    return 0;
}

Output

Map size: 0

Summary

In this tutorial, we learned How to create an Empty Map in C++ language with well detailed examples.