C++ initializer_list::end() Function

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The std::initializer_list::end() function return an iterator pointing to the last element in the initializer_list. This function is particularly useful for iterating over the elements of an initializer_list, providing an end marker for loops. It is used in conjunction with begin() to enable range-based operations, such as for loops that requires start and end iterators.

Syntax

Following is the syntax for std::initializer_list::end() function.

const T* end() const noexcept;

Parameters

It does not accepts any parameters

Return value

This function returns a pointer to the pst the end element in the initializer_list.

Time complexity

The time complexity of this function is Constant i.e. O(1)

Example

In the following example, we are going to consider the basic usage of the end() function.

#include <iostream>
#include <initializer_list>
void a(std::initializer_list < int > b) {
   for (auto x = b.begin(); x != b.end(); ++x) {
      std::cout << * x << " ";
   }
   std::cout << std::endl;
}
int main() {
   a({1,3,5});
   return 0;
}

Output

Output of the above code is as follows −

1 3 5

Example

Consider the following example, where we are going to find the maximum value in the initializer_list.

#include <iostream>
#include <initializer_list>
#include <algorithm>
int a(std::initializer_list < int > b) {
   if (b.size() == 0) return 0;
   return * std::max_element(b.begin(), b.end());
}
int main() {
   int x = a({1,3,5,2,6});
   std::cout << "Result : " << x << std::endl;
   return 0;
}

Output

Following is the output of the above code −

Result : 6

Example

Let's look at the following example, where we are going to count the total number of elements in the initializer_list.

#include <iostream>
#include <initializer_list>
size_t a(std::initializer_list < int > b) {
   return std::distance(b.begin(), b.end());
}
int main() {
   size_t x = a({11,2,31,2});
   std::cout << "Result : " << x << std::endl;
   return 0;
}

Output

If we run the above code it will generate the following output −

Result : 4