...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Access an element, with bounds checking.
value& at( std::size_t pos); »more...
value&& at( std::size_t pos); »more...
value const& at( std::size_t pos) const; »more...