basic_static_string::operator+= (2 of 5 overloads)

Append to the string.

BOOST_STATIC_STRING_CPP14_CONSTEXPR basic_static_string&
operator+=(
    value_type ch);

Appends the given character ch to the end of the string.

Type	Thrown On
`std::length_error`	if `1 > max_size() - size()`