std::basic_string_view<CharT,Traits>::at

Since C++17

Returns a const reference to the character at specified location pos. Bounds checking is performed, exception of type std::out_of_range will be thrown on invalid access.

# Declarations

constexpr const_reference at( size_type pos ) const;

(since C++17)

# Parameters

# Return value

Const reference to the requested character.

# Example

#include <iostream>
#include <stdexcept>
#include <string_view>
 
int main()
{
    std::string_view str_view("abcdef");
 
    try
    {
        for (std::size_t i = 0; true; ++i)
            std::cout << i << ": " << str_view.at(i) << '\n';
    }
    catch (const std::out_of_range& e)
    {
        std::cout << "Whooops. Index is out of range.\n";
        std::cout << e.what() << '\n';
    }
}

# See also