Ejemplos de Sema::CompareReferenceRelationship en C++ (Cpp)

Ejemplo n.º 1

Archivo: SemaNamedCast.cpp Proyecto: blickly/llvm-clang-PRETC

/// Tests whether a conversion according to N2844 is valid.
TryStaticCastResult
TryLValueToRValueCast(Sema &Self, Expr *SrcExpr, QualType DestType,
                      const SourceRange &OpRange)
{
  // N2844 5.2.9p3: An lvalue of type "cv1 T1" can be cast to type "rvalue
  //   reference to cv2 T2" if "cv2 T2" is reference-compatible with "cv1 T1".
  const RValueReferenceType *R = DestType->getAsRValueReferenceType();
  if (!R)
    return TSC_NotApplicable;

  if (SrcExpr->isLvalue(Self.Context) != Expr::LV_Valid)
    return TSC_NotApplicable;

  // Because we try the reference downcast before this function, from now on
  // this is the only cast possibility, so we issue an error if we fail now.
  bool DerivedToBase;
  if (Self.CompareReferenceRelationship(SrcExpr->getType(), R->getPointeeType(),
                                        DerivedToBase) <
        Sema::Ref_Compatible_With_Added_Qualification) {
    Self.Diag(OpRange.getBegin(), diag::err_bad_lvalue_to_rvalue_cast)
      << SrcExpr->getType() << R->getPointeeType() << OpRange;
    return TSC_Failed;
  }

  // FIXME: Similar to CheckReferenceInit, we actually need more AST annotation
  // than nothing.
  return TSC_Success;
}