move isDerivedFrom() from a clang plugin to shared code, for reuse

Change-Id: I7b9b41a7081281214a387cdf02080866e9b9dfe7
Reviewed-on: https://gerrit.libreoffice.org/68873
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

1 files changed, 1 insertions, 32 deletions

diff --git a/compilerplugins/clang/refcounting.cxx b/compilerplugins/clang/refcounting.cxx
index 6ae861cfcad9..535808a3a0ca 100644
--- a/compilerplugins/clang/refcounting.cxx
+++ b/compilerplugins/clang/refcounting.cxx
@@ -35,7 +35,7 @@ not delete on last 'release'.
 
 */
 
-namespace {
+namespace loplugin {
 
 class RefCounting:
     public loplugin::FilteringPlugin<RefCounting>
@@ -72,37 +72,6 @@ private:
     bool visitTemporaryObjectExpr(Expr const * expr);
 };
 
-typedef std::function<bool(Decl const *)> DeclChecker;
-
-bool BaseCheckNotSubclass(const CXXRecordDecl *BaseDefinition, void *p) {
-    if (!BaseDefinition)
-        return true;
-    auto const & base = *static_cast<const DeclChecker *>(p);
-    if (base(BaseDefinition)) {
-        return false;
-    }
-    return true;
-}
-
-bool isDerivedFrom(const CXXRecordDecl *decl, DeclChecker base) {
-    if (!decl)
-        return false;
-    if (base(decl))
-        return true;
-    if (!decl->hasDefinition()) {
-        return false;
-    }
-    if (!decl->forallBases(
-            [&base](const CXXRecordDecl *BaseDefinition) -> bool
-                { return BaseCheckNotSubclass(BaseDefinition, &base); },
-            true))
-    {
-        return true;
-    }
-    return false;
-}
-
-
 bool containsXInterfaceSubclass(const clang::Type* pType0);
 
 bool containsXInterfaceSubclass(const QualType& qType) {