Method isBoundary

extlibs/catch/include/catch/catch.hpp:8198–8206

		auto line() const -> std::string const& { return m_column.m_strings[m_stringIndex]; }

		auto isBoundary(size_t at) const -> bool {
			assert(at > 0);
			assert(at <= line().size());

			return at == line().size() ||
				(isWhitespace(line()[at]) && !isWhitespace(line()[at - 1])) ||
				isBreakableBefore(line()[at]) ||
				isBreakableAfter(line()[at - 1]);
		}

		void calcLength() {
			assert(m_stringIndex < m_column.m_strings.size());