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 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>
:
#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
access the last element (public member function) |
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