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

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< cpp‎ | string‎ | basic string view

constexpr const_reference operator[]( size_type pos ) const; |  | (since C++17)

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

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

### Parameters

pos | - | position of the character to return

### 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

Run this code

    #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';
    }

Output:

    e
    y

### See also

at (C++17) | accesses the specified character with bounds checking (public member function)
operator[] | accesses the specified character (public member function of `std::basic_string<CharT,Traits,Allocator>`)

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