std::forward_list::front

1	`reference front();`

(since C++11)

1	`const_reference front()` `const;`

(since C++11)

Returns a reference to the first element in the container.

Calling front on an empty container is undefined.

Parameters

(none).

Return value

reference to the first element.

Complexity

Constant.

Notes

For a container c, the expression c.front() is equivalent to *c.begin().

Example

The following code uses front to display the first element of a std::forward_list<char>:

#include <forward_list>
#include <iostream>
  
int main()
{
    std::forward_list<char> letters {'o', 'm', 'g', 'w', 't', 'f'};
  
    if (!letters.empty()) {
        std::cout << "The first character is: " << letters.front() << '\n';
    }  
}

Output:

1	`The first character is o`

Links:

http://en.cppreference.com/w/cpp/container/forward_list/front

doc_CPP

2025-01-10 15:47:30

Comments