Merge pull request #2047 from gluk256/v_bugfix_udp

MSVS compiler error and warnings fixed

libp2p/UDP.h

@@ -65,8 +65,8 @@ protected:
  */
 struct RLPXDatagramFace: public UDPDatagram
 {
-	static uint32_t futureFromEpoch(std::chrono::seconds _sec) { return std::chrono::duration_cast<std::chrono::seconds>((std::chrono::system_clock::now() + _sec).time_since_epoch()).count(); }
-	static uint32_t secondsSinceEpoch() { return std::chrono::duration_cast<std::chrono::seconds>((std::chrono::system_clock::now()).time_since_epoch()).count(); }
+	static uint32_t futureFromEpoch(std::chrono::seconds _sec) { return static_cast<uint32_t>(std::chrono::duration_cast<std::chrono::seconds>((std::chrono::system_clock::now() + _sec).time_since_epoch()).count()); }
+	static uint32_t secondsSinceEpoch() { return static_cast<uint32_t>(std::chrono::duration_cast<std::chrono::seconds>((std::chrono::system_clock::now()).time_since_epoch()).count()); }
 	static Public authenticate(bytesConstRef _sig, bytesConstRef _rlp);
 
 	virtual uint8_t packetType() = 0;
@@ -115,7 +115,7 @@ class UDPSocket: UDPSocketFace, public std::enable_shared_from_this<UDPSocket<Ha
 {
 public:
 	enum { maxDatagramSize = MaxDatagramSize };
-	static_assert(maxDatagramSize < 65507, "UDP datagrams cannot be larger than 65507 bytes");
+	static_assert(unsigned(maxDatagramSize) < 65507, "UDP datagrams cannot be larger than 65507 bytes");
 
 	/// Create socket for specific endpoint.
 	UDPSocket(ba::io_service& _io, UDPSocketEvents& _host, bi::udp::endpoint _endpoint): m_host(_host), m_endpoint(_endpoint), m_socket(_io) { m_started.store(false); m_closed.store(true); };