at overloads
Declared in <bslstl_string.h>
Return a reference providing modifiable access to the character at the specified position in this string. Throw out_of_range if position >= length().
reference
at(size_type position);
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Return a reference providing non-modifiable access to the character at the specified position in this string. Throw out_of_range if position >= length().
const_reference
at(size_type position) const;
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