std::span<T,Extent>::front

< cpp‎ | container‎ | span
constexpr reference front() const;

Returns a reference to the first element in the span.

Calling front on an empty span results in undefined behavior.

Parameters

(none)

Return value

A reference to the first element.

Complexity

Constant

Notes

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

Example

See also

access the last element
(public member function)