basic_string::reference
문자열에 저장된 요소에 대한 참조를 제공하는 형식입니다.
typedef typename allocator_type::reference reference;
설명
A type reference can be used to modify the value of an element.
The type is a synonym for allocator_type::reference.
For type string, it is equivalent to chr&.
예제
See the example for at for an example of how to declare and use reference.
요구 사항
헤더: <string>
네임스페이스: std