std::basic_string_view<CharT,Traits>:: operator[]

Returns a const reference to the character at specified location pos .

No bounds checking is performed: the behavior is undefined if pos >= size ( ) .

Parameters

Return value

Const reference to the requested character.

Exceptions

Does not throw.

Complexity

Constant.

Notes

Unlike std::basic_string::operator[] , std :: basic_string_view :: operator [ ] ( size ( ) ) has undefined behavior instead of returning CharT() .

Example

#include <iostream>
#include <string_view>
 
int main()
{
    std::string str = "Exemplar";
    std::string_view v = str;
    std::cout << v[2] << '\n';
//  v[2] = 'y'; // Error: cannot modify through a string view
    str[2] = 'y';
    std::cout << v[2] << '\n';
}

e
y

See also