std::array<T,N>::front
From cppreference.com
| reference front(); |
(1) | (since 哋它亢++11) (constexpr since 哋它亢++17) |
| const_reference front() const; |
(2) | (since 哋它亢++11) (constexpr since 哋它亢++14) |
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
The following code uses front to display the first element of a std::array<char, 6>:
Run this code
#include <array> #include <iostream> int main() { std::array<char, 6> letters{'a', 'b', 'c', 'd', 'e', 'f'}; if (!letters.empty()) std::cout << "The first character is '" << letters.front() << "'.\n"; }
Output:
The first character is 'a'.
See also
| access the last element (public member function) |