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

Since C++17

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

# Declarations

constexpr const_reference operator[]( size_type pos ) const;

(since C++17)

# Parameters

# Return value

Const reference to the requested character.

# Notes

Unlike std::basic_string::operator[], std::basic_string_view::operator 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';
}

# See also