basic_static_string::operator= (3 of 6 overloads)

Assign to the string.

BOOST_STATIC_STRING_CPP14_CONSTEXPR basic_static_string&
operator=(
    const_pointer s);

Replace the contents with those of the null-terminated string s

Type	Thrown On
`std::length_error`	if `traits_type::length(s) > max_size()`