bugfix for vector sender; path methods

- When passing an r-value reference to ::send_datagram(...), we must make the shared_ptr keep-alive prior to constructing the string_view pointing into the data
- Path spaceship/==/!= methods added plus hash for indexing using paths

include/oxen/quic/address.hpp

@@ -246,6 +246,7 @@ namespace oxen::quic
                     return r <=> 0;
                 return oxenc::big_to_host(a.sin_port) <=> oxenc::big_to_host(b.sin_port);
             }
+
             if (is_ipv6() && other.is_ipv6())
             {
                 auto& a = in6();
@@ -258,6 +259,7 @@ namespace oxen::quic
         }
 
         bool operator==(const Address& other) const { return (*this <=> other) == 0; }
+
         bool operator!=(const Address& other) const { return !(*this == other); }
 
         // Returns the size of the sockaddr
@@ -340,6 +342,12 @@ namespace oxen::quic
             return *this;
         }
 
+        auto operator<=>(const Path& other) const { return std::tie(local, remote) <=> std::tie(other.local, other.remote); }
+
+        bool operator==(const Path& other) const { return (*this <=> other) == 0; }
+
+        bool operator!=(const Path& other) const { return !(*this == other); }
+
         // template code to pass Path as ngtcp2_path into ngtcp2 functions
         template <typename T>
             requires std::same_as<T, ngtcp2_path>
@@ -390,4 +398,15 @@ namespace std
             return h;
         }
     };
+
+    template <>
+    struct hash<oxen::quic::Path>
+    {
+        size_t operator()(const oxen::quic::Path& addr) const
+        {
+            auto h = hash<oxen::quic::Address>{}(addr.local);
+            h ^= hash<oxen::quic::Address>{}(addr.remote);
+            return h;
+        }
+    };
 }  // namespace std

include/oxen/quic/connection.hpp

@@ -129,9 +129,9 @@ namespace oxen::quic
         template <oxenc::basic_char Char>
         void send_datagram(std::vector<Char>&& buf)
         {
-            send_datagram(
-                    std::basic_string_view<Char>{buf.data(), buf.size()},
-                    std::make_shared<std::vector<Char>>(std::move(buf)));
+            auto keep_alive = std::make_shared<std::vector<Char>>(std::move(buf));
+            std::basic_string_view<Char> view{keep_alive->data(), keep_alive->size()};
+            send_datagram(view, std::move(keep_alive));
         }
 
         template <oxenc::basic_char CharType>