AST: add the possibility to compare SubstitutionMaps

Author: eeckstein

SwiftCompilerSources/Sources/AST/SubstitutionMap.swift

@@ -24,11 +24,11 @@ public struct SubstitutionMap: CustomStringConvertible, NoReflectionChildren {
   public init(bridged: BridgedSubstitutionMap) {
     self.bridged = bridged
   }
-  
+
   public init() {
     self.bridged = BridgedSubstitutionMap()
   }
-  
+
   public init(genericSignature: GenericSignature, replacementTypes: [Type]) {
     let bridgedReplTypes = replacementTypes.map { $0.bridged }
     self.bridged = bridgedReplTypes.withBridgedArrayRef {
@@ -73,4 +73,8 @@ public struct SubstitutionMap: CustomStringConvertible, NoReflectionChildren {
     assert(replacementTypes.count == 1)
     return replacementTypes[0]
   }
+
+  public static func ==(lhs: SubstitutionMap, rhs: SubstitutionMap) -> Bool {
+    lhs.bridged.isEqualTo(rhs.bridged)
+  }
 }

include/swift/AST/ASTBridging.h

@@ -3171,6 +3171,7 @@ struct BridgedSubstitutionMap {
   BRIDGED_INLINE BridgedSubstitutionMap();
   BridgedOwnedString getDebugDescription() const;
   BRIDGED_INLINE bool isEmpty() const;
+  BRIDGED_INLINE bool isEqualTo(BridgedSubstitutionMap rhs) const;
   BRIDGED_INLINE bool hasAnySubstitutableParams() const;
   BRIDGED_INLINE SwiftInt getNumConformances() const;
   SWIFT_IMPORT_UNSAFE BRIDGED_INLINE BridgedConformance getConformance(SwiftInt index) const;

include/swift/AST/ASTBridgingImpl.h

@@ -759,6 +759,10 @@ bool BridgedSubstitutionMap::isEmpty() const {
   return unbridged().empty();
 }
 
+bool BridgedSubstitutionMap::isEqualTo(BridgedSubstitutionMap rhs) const {
+  return unbridged() == rhs.unbridged();
+}
+
 bool BridgedSubstitutionMap::hasAnySubstitutableParams() const {
   return unbridged().hasAnySubstitutableParams();
 }