How to use a lambda expression and the generate() function In C++

7. Initializing the List using the fill() function

Create and initialize a list in C++ STL with a lambda expression and the generate() function. The lambda expression captures variables and defines the logic for generating values. By applying the generate() function to the list range, the generated values are to be assigned to the respective list of elements. This approach provides a concise and efficient way to populate a list with custom-generated values.

Syntax

std::generate(list.begin(), list.end(), [&]() { /* lambda expression */ });

Example

C++

#include <iostream>
#include <list>
#include <algorithm>
 
int main() {
    std::list<int> myList(5);
    int value = 1;
    std::generate(myList.begin(), myList.end(), [&value]() { return value++; });
 
    // Print the contents of the list
    for (const auto& element : myList) {
        std::cout << element << " ";
    }
    std::cout << std::endl;
 
    return 0;
}

Output:

1 2 3 4 5

Different Ways to Initialize a List in C++ STL

Prerequisite: List in C++

Lists are sequence containers that allow non-contiguous memory allocation The following are the different ways to create and initialize a List in C++ STL.

Initializing an empty List and pushing values one by one
Specifying List size and initializing all values
Initializing List like the arrays
Initializing a list from an array
Initializing a list from a vector
Initializing a list from another List
Initializing the List using the fill() function
Using a lambda expression and the generate() function:

How to use a lambda expression and the generate() function In C++

C++

Output:

Different Ways to Initialize a List in C++ STL

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