map::size() in C++ STL

In C++, the std::map::size() is a built-in method used to find the number of elements in std::map container. It is the member function of std::map defined inside <map> header fie. In this article, we will learn about std::map::size() method in C++.

Example:

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map::size() Syntax

m.size()

Parameters

• This function does not take any parameter.

Return Value

• Returns the number of elements in the map.
• If the map is empty, returns 0.

More Examples of map::size()

The following examples demonstrates the use of map::size() function in different scenarios:

Example 1: Checking the Size of an Empty Map

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Example 2: Size of Map after Erasing Elements