basic_static_string::operator+= (3 of 5 overloads)

Append to the string.

constexpr basic_static_string&
operator+=(
    const_pointer s);

Appends count characters from the string pointed to by s to the end of the string, where count is traits_type::length(s).

Strong guarantee.

*this

Name	Description
`s`	The string to append.

Type	Thrown On
`std::length_error`	`size() + count > max_size()`