Added a function to check whether a Decl is in

the list of Decls for a given DeclContext.  This
is useful for LLDB's implementation of
FindExternalLexicalDecls.

llvm-svn: 181093

clang/include/clang/AST/DeclBase.h

@@ -1412,6 +1412,9 @@ public:
 
   /// @brief Removes a declaration from this context.
   void removeDecl(Decl *D);
+    
+  /// @brief Checks whether a declaration is in this context.
+  bool containsDecl(Decl *D) const;
 
   /// lookup_iterator - An iterator that provides access to the results
   /// of looking up a name within this context.

clang/lib/AST/DeclBase.cpp

@@ -1064,6 +1064,11 @@ bool DeclContext::decls_empty() const {
   return !FirstDecl;
 }
 
+bool DeclContext::containsDecl(Decl *D) const {
+  return (D->getLexicalDeclContext() == this &&
+          (D->NextInContextAndBits.getPointer() || D == LastDecl));
+}
+
 void DeclContext::removeDecl(Decl *D) {
   assert(D->getLexicalDeclContext() == this &&
          "decl being removed from non-lexical context");