basic_static_string::assign (2 of 12 overloads)

Replace the contents.

template<
    std::size_t M>
BOOST_STATIC_STRING_CPP14_CONSTEXPR basic_static_string&
assign(
    const basic_static_string< M, CharT, Traits >& s);

Replace the contents with a copy of another basic_static_string

Type	Thrown On
`std::length_error`	if `s.size() > max_size()`

*this