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

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< cpp‎ | string‎ | basic string view

constexpr const_reference at( size_type pos ) const; |  | (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.

### Parameters

pos | - | position of the character to return

### Return value

`Const` reference to the requested character.

### Exceptions

Throws std::out_of_range if pos >= size().

### Complexity

Constant.

### Example

Run this code

    #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';
        }
    }

Possible output:

    0: a
    1: b
    2: c
    3: d
    4: e
    5: f
    6: Whooops. Index is out of range.
    basic_string_view::at: __pos (which is 6) >= this->size() (which is 6)

### See also

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

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