switch some using declarations to new-style typedefs. remove some redundant parenthesis

include/libtorrent/bitfield.hpp

@@ -83,7 +83,7 @@ namespace libtorrent {
 		{
 			TORRENT_ASSERT(index >= 0);
 			TORRENT_ASSERT(index < size());
-			return (buf()[index / 32] & aux::host_to_network((0x80000000 >> (index & 31)))) != 0;
+			return (buf()[index / 32] & aux::host_to_network(0x80000000 >> (index & 31))) != 0;
 		}
 
 		// set bit at ``index`` to 0 (clear_bit) or 1 (set_bit).
@@ -97,7 +97,7 @@ namespace libtorrent {
 		{
 			TORRENT_ASSERT(index >= 0);
 			TORRENT_ASSERT(index < size());
-			buf()[index / 32] |= aux::host_to_network((0x80000000 >> (index & 31)));
+			buf()[index / 32] |= aux::host_to_network(0x80000000 >> (index & 31));
 		}
 
 		// returns true if all bits in the bitfield are set

include/libtorrent/error_code.hpp

@@ -479,14 +479,14 @@ namespace libtorrent {
 	// returns the error_category for HTTP errors
 	TORRENT_EXPORT boost::system::error_category& http_category();
 
-	using boost::system::error_code;
-	using boost::system::error_condition;
+	using error_code = boost::system::error_code;
+	using error_condition = boost::system::error_condition;
 
 	// internal
 	using boost::system::generic_category;
 	using boost::system::system_category;
 
-	using boost::system::system_error;
+	using system_error = boost::system::system_error;
 
 #ifndef BOOST_NO_EXCEPTIONS
 #ifndef TORRENT_NO_DEPRECATE

include/libtorrent/file.hpp

@@ -180,8 +180,6 @@ namespace libtorrent {
 		constexpr open_mode_t attribute_mask = attribute_hidden | attribute_executable;
 	}
 
-	using namespace flags;
-
 	struct TORRENT_EXTRA_EXPORT file : boost::noncopyable
 	{
 		file();

include/libtorrent/io_service.hpp

@@ -44,9 +44,9 @@ POSSIBILITY OF SUCH DAMAGE.
 namespace libtorrent {
 
 #if defined TORRENT_BUILD_SIMULATOR
-	using sim::asio::io_service;
+	using io_service = sim::asio::io_service;
 #else
-	using boost::asio::io_service;
+	using io_service = boost::asio::io_service;
 #endif
 }
 

include/libtorrent/socket.hpp

@@ -68,17 +68,17 @@ POSSIBILITY OF SUCH DAMAGE.
 namespace libtorrent {
 
 #if defined TORRENT_BUILD_SIMULATOR
-	using sim::asio::ip::udp;
-	using sim::asio::ip::tcp;
+	using udp = sim::asio::ip::udp;
+	using tcp = sim::asio::ip::tcp;
 	using sim::asio::async_write;
 	using sim::asio::async_read;
-	using sim::asio::null_buffers;
+	using null_buffers = sim::asio::null_buffers;
 #else
-	using boost::asio::ip::tcp;
-	using boost::asio::ip::udp;
+	using tcp = boost::asio::ip::tcp;
+	using udp = boost::asio::ip::udp;
 	using boost::asio::async_write;
 	using boost::asio::async_read;
-	using boost::asio::null_buffers;
+	using null_buffers = boost::asio::null_buffers;
 #endif
 
 #ifdef TORRENT_WINDOWS

include/libtorrent/time.hpp

@@ -58,11 +58,11 @@ namespace libtorrent {
 	using minutes32 = std::chrono::duration<std::int32_t, std::ratio<60>>;
 	using time_point32 = std::chrono::time_point<clock_type, seconds32>;
 
-	using std::chrono::seconds;
-	using std::chrono::milliseconds;
-	using std::chrono::microseconds;
-	using std::chrono::minutes;
-	using std::chrono::hours;
+	using seconds = std::chrono::seconds;
+	using milliseconds = std::chrono::milliseconds;
+	using microseconds = std::chrono::microseconds;
+	using minutes = std::chrono::minutes;
+	using hours = std::chrono::hours;
 	using std::chrono::duration_cast;
 	using std::chrono::time_point_cast;
 

simulation/test_dht_storage.cpp

@@ -51,7 +51,7 @@ POSSIBILITY OF SUCH DAMAGE.
 using namespace lt;
 using namespace lt::dht;
 using namespace sim;
-using namespace sim::chrono;
+using sim::chrono::high_resolution_clock;
 using namespace sim::asio;
 using sim::simulation;
 using sim::default_config;