basic_static_string::operator+= (4 of 5 overloads)

Append to the string.

BOOST_STATIC_STRING_CPP14_CONSTEXPR basic_static_string&
operator+=(
    std::initializer_list< value_type > ilist);

Appends characters from initializer list ilist The appended string can contain null characters.

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

*this