reference front(); | (since C++11) | |
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:
The first character is o
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