NAME¶

std::deque::front - std::deque::front

Synopsis¶

reference front();
const_reference front() const;

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::deque<char>:

// Run this code

#include <deque>
#include <iostream>

int main()
{
std::deque<char> letters {'o', 'm', 'g', 'w', 't', 'f'};

if (!letters.empty()) {
std::cout << "The first character is '" << letters.front() << "'.\n";
}
}

Output:¶

The first character is 'o'.

See also¶

back access the last element
(public member function)