at overloads
Declared in <bslstl_vector.h>
Return a reference providing modifiable access to the element at the specified position in this vector. Throw a std::out_of_range exception if position >= size().
reference
at(size_type position);
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Return a reference providing non-modifiable access to the element at the specified position in this vector. Throw a bsl::out_of_range exception if position >= size().
const_reference
at(size_type position) const;
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