NAME

std::basic_string_view::operator[] - std::basic_string_view::operator[]

Synopsis

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