Function sub_title

tests/cppunit/htmloutput.cpp:174–180

		}

		void
		sub_title(ostream& os, const string& title, int size)
		{
			ostringstream h;
			h << "h" << size;
			os << "<" << h.str() << ">" << escape(title) << "</" << h.str() << ">\n";
		}

		void
		sub_title(ostream& os, const string& title, int size, const string& mark)