std::deque<T,Allocator>::front

reference front();

const_reference front() const;

Returns a reference to the first element in the container.

Calling front on an empty container causes undefined behavior.

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

#include <deque>
#include <iostream>
 
int main()
{
    std::deque<char> letters {'a', 'b', 'c', 'd', 'e', 'f'};
 
    if (!letters.empty())
        std::cout << "The first character is '" << letters.front() << "'.\n";
}

The first character is 'a'.

See also