Method span_input_adapter

Source/external/json.hpp:6543–6544

				   sizeof(typename std::remove_pointer<CharT>::type) == 1,
				   int >::type = 0 >
	span_input_adapter(CharT b, std::size_t l)
		: ia(reinterpret_cast<const char*>(b), reinterpret_cast<const char*>(b) + l) {}

	template<class IteratorType,
			 typename std::enable_if<