std::vector::at

From cppreference.com

reference       at( size_type pos );
const_reference at( size_type pos ) const;

Returns a reference to the element at specified location pos. Bounds checking is performed, exception of type std::out_of_range will be thrown on invalid access.

Contents

[edit] Parameters

pos - position of the element to return

[edit] Return value

reference to the requested element

[edit] Exceptions

std::out_of_range if !(pos < size()).

[edit] Complexity

Constant

[edit] See also

access specified element
(public member function)