src: use spaceship operator in SocketAddress

src/node_sockaddr-inl.h

@@ -172,22 +172,9 @@ bool SocketAddress::operator!=(const SocketAddress& other) const {
   return !(*this == other);
 }
 
-bool SocketAddress::operator<(const SocketAddress& other) const {
-  return compare(other) == CompareResult::LESS_THAN;
-}
-
-bool SocketAddress::operator>(const SocketAddress& other) const {
-  return compare(other) == CompareResult::GREATER_THAN;
-}
-
-bool SocketAddress::operator<=(const SocketAddress& other) const {
-  CompareResult c = compare(other);
-  return c == CompareResult::NOT_COMPARABLE ? false :
-              c <= CompareResult::SAME;
-}
-
-bool SocketAddress::operator>=(const SocketAddress& other) const {
-  return compare(other) >= CompareResult::SAME;
+std::partial_ordering SocketAddress::operator<=>(
+    const SocketAddress& other) const {
+  return compare(other);
 }
 
 template <typename T>

src/node_sockaddr.cc

@@ -154,9 +154,8 @@ bool is_match_ipv4_ipv6(
                 sizeof(uint32_t)) == 0;
 }
 
-SocketAddress::CompareResult compare_ipv4(
-    const SocketAddress& one,
-    const SocketAddress& two) {
+std::partial_ordering compare_ipv4(const SocketAddress& one,
+                                   const SocketAddress& two) {
   const sockaddr_in* one_in =
       reinterpret_cast<const sockaddr_in*>(one.data());
   const sockaddr_in* two_in =
@@ -165,31 +164,29 @@ SocketAddress::CompareResult compare_ipv4(
   const uint32_t s_addr_two = ntohl(two_in->sin_addr.s_addr);
 
   if (s_addr_one < s_addr_two)
-    return SocketAddress::CompareResult::LESS_THAN;
+    return std::partial_ordering::less;
   else if (s_addr_one == s_addr_two)
-    return SocketAddress::CompareResult::SAME;
+    return std::partial_ordering::equivalent;
   else
-    return SocketAddress::CompareResult::GREATER_THAN;
+    return std::partial_ordering::greater;
 }
 
-SocketAddress::CompareResult compare_ipv6(
-    const SocketAddress& one,
-    const SocketAddress& two) {
+std::partial_ordering compare_ipv6(const SocketAddress& one,
+                                   const SocketAddress& two) {
   const sockaddr_in6* one_in =
       reinterpret_cast<const sockaddr_in6*>(one.data());
   const sockaddr_in6* two_in =
       reinterpret_cast<const sockaddr_in6*>(two.data());
   int ret = memcmp(&one_in->sin6_addr, &two_in->sin6_addr, 16);
   if (ret < 0)
-    return SocketAddress::CompareResult::LESS_THAN;
+    return std::partial_ordering::less;
   else if (ret > 0)
-    return SocketAddress::CompareResult::GREATER_THAN;
-  return SocketAddress::CompareResult::SAME;
+    return std::partial_ordering::greater;
+  return std::partial_ordering::equivalent;
 }
 
-SocketAddress::CompareResult compare_ipv4_ipv6(
-    const SocketAddress& ipv4,
-    const SocketAddress& ipv6) {
+std::partial_ordering compare_ipv4_ipv6(const SocketAddress& ipv4,
+                                        const SocketAddress& ipv6) {
   const sockaddr_in* ipv4_in =
       reinterpret_cast<const sockaddr_in*>(ipv4.data());
   const sockaddr_in6 * ipv6_in =
@@ -199,18 +196,18 @@ SocketAddress::CompareResult compare_ipv4_ipv6(
       reinterpret_cast<const uint8_t*>(&ipv6_in->sin6_addr);
 
   if (memcmp(ptr, mask, sizeof(mask)) != 0)
-    return SocketAddress::CompareResult::NOT_COMPARABLE;
+    return std::partial_ordering::unordered;
 
   int ret = memcmp(
       &ipv4_in->sin_addr,
       ptr + sizeof(mask),
       sizeof(uint32_t));
 
   if (ret < 0)
-    return SocketAddress::CompareResult::LESS_THAN;
+    return std::partial_ordering::less;
   else if (ret > 0)
-    return SocketAddress::CompareResult::GREATER_THAN;
-  return SocketAddress::CompareResult::SAME;
+    return std::partial_ordering::greater;
+  return std::partial_ordering::equivalent;
 }
 
 bool in_network_ipv4(
@@ -235,7 +232,7 @@ bool in_network_ipv6(
   // Special case, if prefix == 128, then just do a
   // straight comparison.
   if (prefix == 128)
-    return compare_ipv6(ip, net) == SocketAddress::CompareResult::SAME;
+    return compare_ipv6(ip, net) == std::partial_ordering::equivalent;
 
   uint8_t r = prefix % 8;
   int len = (prefix - r) / 8;
@@ -263,7 +260,7 @@ bool in_network_ipv4_ipv6(
     int prefix) {
 
   if (prefix == 128)
-    return compare_ipv4_ipv6(ip, net) == SocketAddress::CompareResult::SAME;
+    return compare_ipv4_ipv6(ip, net) == std::partial_ordering::equivalent;
 
   uint8_t r = prefix % 8;
   int len = (prefix - r) / 8;
@@ -293,7 +290,7 @@ bool in_network_ipv6_ipv4(
     const SocketAddress& net,
     int prefix) {
   if (prefix == 32)
-    return compare_ipv4_ipv6(net, ip) == SocketAddress::CompareResult::SAME;
+    return compare_ipv4_ipv6(net, ip) == std::partial_ordering::equivalent;
 
   uint32_t m = ((1ull << prefix) - 1) << (32 - prefix);
 
@@ -337,8 +334,7 @@ bool SocketAddress::is_match(const SocketAddress& other) const {
   return false;
 }
 
-SocketAddress::CompareResult SocketAddress::compare(
-    const SocketAddress& other) const {
+std::partial_ordering SocketAddress::compare(const SocketAddress& other) const {
   switch (family()) {
     case AF_INET:
       switch (other.family()) {
@@ -349,24 +345,23 @@ SocketAddress::CompareResult SocketAddress::compare(
     case AF_INET6:
       switch (other.family()) {
         case AF_INET: {
-          CompareResult c = compare_ipv4_ipv6(other, *this);
-          switch (c) {
-            case SocketAddress::CompareResult::NOT_COMPARABLE:
-              // Fall through
-            case SocketAddress::CompareResult::SAME:
-              return c;
-            case SocketAddress::CompareResult::GREATER_THAN:
-              return SocketAddress::CompareResult::LESS_THAN;
-            case SocketAddress::CompareResult::LESS_THAN:
-              return SocketAddress::CompareResult::GREATER_THAN;
+          auto c = compare_ipv4_ipv6(other, *this);
+          if (c == std::partial_ordering::unordered) {
+            return std::partial_ordering::unordered;
+          } else if (c == std::partial_ordering::equivalent) {
+            return std::partial_ordering::equivalent;
+          } else if (c == std::partial_ordering::less) {
+            return std::partial_ordering::greater;
+          } else if (c == std::partial_ordering::greater) {
+            return std::partial_ordering::less;
           }
           break;
         }
         case AF_INET6: return compare_ipv6(*this, other);
       }
       break;
   }
-  return SocketAddress::CompareResult::NOT_COMPARABLE;
+  return std::partial_ordering::unordered;
 }
 
 bool SocketAddress::is_in_network(

src/node_sockaddr.h

@@ -11,9 +11,10 @@
 #include "uv.h"
 #include "v8.h"
 
+#include <compare>
+#include <list>
 #include <memory>
 #include <string>
-#include <list>
 #include <unordered_map>
 
 namespace node {
@@ -22,24 +23,14 @@ class Environment;
 
 class SocketAddress : public MemoryRetainer {
  public:
-  enum class CompareResult {
-    NOT_COMPARABLE = -2,
-    LESS_THAN,
-    SAME,
-    GREATER_THAN
-  };
-
   struct Hash {
     size_t operator()(const SocketAddress& addr) const;
   };
 
   inline bool operator==(const SocketAddress& other) const;
   inline bool operator!=(const SocketAddress& other) const;
 
-  inline bool operator<(const SocketAddress& other) const;
-  inline bool operator>(const SocketAddress& other) const;
-  inline bool operator<=(const SocketAddress& other) const;
-  inline bool operator>=(const SocketAddress& other) const;
+  inline std::partial_ordering operator<=>(const SocketAddress& other) const;
 
   inline static bool is_numeric_host(const char* hostname);
   inline static bool is_numeric_host(const char* hostname, int family);
@@ -102,7 +93,7 @@ class SocketAddress : public MemoryRetainer {
   bool is_match(const SocketAddress& other) const;
 
   // Compares this SocketAddress to the given other SocketAddress.
-  CompareResult compare(const SocketAddress& other) const;
+  std::partial_ordering compare(const SocketAddress& other) const;
 
   // Returns true if this SocketAddress is within the subnet
   // identified by the given network address and CIDR prefix.

test/cctest/test_sockaddr.cc

@@ -145,19 +145,19 @@ TEST(SocketAddress, Comparison) {
   SocketAddress addr5(reinterpret_cast<const sockaddr*>(&storage[4]));
   SocketAddress addr6(reinterpret_cast<const sockaddr*>(&storage[5]));
 
-  CHECK_EQ(addr1.compare(addr1), SocketAddress::CompareResult::SAME);
-  CHECK_EQ(addr1.compare(addr2), SocketAddress::CompareResult::LESS_THAN);
-  CHECK_EQ(addr2.compare(addr1), SocketAddress::CompareResult::GREATER_THAN);
+  CHECK_EQ(addr1.compare(addr1), std::partial_ordering::equivalent);
+  CHECK_EQ(addr1.compare(addr2), std::partial_ordering::less);
+  CHECK_EQ(addr2.compare(addr1), std::partial_ordering::greater);
   CHECK(addr1 <= addr1);
   CHECK(addr1 < addr2);
   CHECK(addr1 <= addr2);
   CHECK(addr2 >= addr2);
   CHECK(addr2 > addr1);
   CHECK(addr2 >= addr1);
 
-  CHECK_EQ(addr3.compare(addr3), SocketAddress::CompareResult::SAME);
-  CHECK_EQ(addr3.compare(addr4), SocketAddress::CompareResult::LESS_THAN);
-  CHECK_EQ(addr4.compare(addr3), SocketAddress::CompareResult::GREATER_THAN);
+  CHECK_EQ(addr3.compare(addr3), std::partial_ordering::equivalent);
+  CHECK_EQ(addr3.compare(addr4), std::partial_ordering::less);
+  CHECK_EQ(addr4.compare(addr3), std::partial_ordering::greater);
   CHECK(addr3 <= addr3);
   CHECK(addr3 < addr4);
   CHECK(addr3 <= addr4);
@@ -166,8 +166,8 @@ TEST(SocketAddress, Comparison) {
   CHECK(addr4 >= addr3);
 
   // Not comparable
-  CHECK_EQ(addr1.compare(addr3), SocketAddress::CompareResult::NOT_COMPARABLE);
-  CHECK_EQ(addr3.compare(addr1), SocketAddress::CompareResult::NOT_COMPARABLE);
+  CHECK_EQ(addr1.compare(addr3), std::partial_ordering::unordered);
+  CHECK_EQ(addr3.compare(addr1), std::partial_ordering::unordered);
   CHECK(!(addr1 < addr3));
   CHECK(!(addr1 > addr3));
   CHECK(!(addr1 >= addr3));
@@ -178,10 +178,10 @@ TEST(SocketAddress, Comparison) {
   CHECK(!(addr3 <= addr1));
 
   // Comparable
-  CHECK_EQ(addr1.compare(addr5), SocketAddress::CompareResult::SAME);
-  CHECK_EQ(addr2.compare(addr6), SocketAddress::CompareResult::SAME);
-  CHECK_EQ(addr1.compare(addr6), SocketAddress::CompareResult::LESS_THAN);
-  CHECK_EQ(addr6.compare(addr1), SocketAddress::CompareResult::GREATER_THAN);
+  CHECK_EQ(addr1.compare(addr5), std::partial_ordering::equivalent);
+  CHECK_EQ(addr2.compare(addr6), std::partial_ordering::equivalent);
+  CHECK_EQ(addr1.compare(addr6), std::partial_ordering::less);
+  CHECK_EQ(addr6.compare(addr1), std::partial_ordering::greater);
   CHECK(addr1 <= addr5);
   CHECK(addr1 <= addr6);
   CHECK(addr1 < addr6);