std::inplace_vector<T,N>::front - cppreference.com (original) (raw)

Returns a reference to the first element in the container.

If empty() is true:

• If the implementation is hardened, a contract violation occurs. Moreover, if the contract-violation handler returns under “observe” evaluation semantic, the behavior is undefined.
• If the implementation is not hardened, the behavior is undefined.

[edit] Return value

Reference to the first element.

[edit] Complexity

Constant.

[edit] Notes

For a container c, the expression c.front() is equivalent to *c.begin().

[edit] Example

The following code uses front to display the first element of a std::inplace_vector<char, 4>:

#include #include   int main() { std::inplace_vector<char, 4> letters{'a', 'b', 'c', 'd'}; assert(letters.front() == 'a'); }

[edit] See also

| | access the last element (public member function) [edit] | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | | returns a reverse iterator to the end (public member function) [edit] | | | returns an iterator to the beginning (public member function) [edit] | | | direct access to the underlying contiguous storage (public member function) [edit] |