Getting type of a Varlen

Walter_Landry · September 25, 2015, 12:51am

Hello,

I am reading an attribute as a Varlen using code like

  auto metadata=dataset.openAttribute ("METADATA");
  H5::VarLenType type=metadata.getVarLenType ();
  hvl_t varlen;
  metadata.read(type, &varlen);

How do I find out what type the VarLenType is based on? I have tried
getSuper(), getTag(), fromClass(), and operator==(), and none of them
seem to work for me. Are there any examples of how to introspectively
figure out what the type is?

Thank you,
Walter Landry

bmribler · September 25, 2015, 1:49am

Hello Walter,

Would AbstractDs::getTypeClass() give you the information you need?

Binh-Minh

···

________________________________________
From: Hdf-forum <hdf-forum-bounces@lists.hdfgroup.org> on behalf of Walter Landry <wlandry@caltech.edu>
Sent: Thursday, September 24, 2015 8:51 PM
To: hdf-forum@lists.hdfgroup.org
Subject: [Hdf-forum] Getting type of a Varlen

Hello,

I am reading an attribute as a Varlen using code like

  auto metadata=dataset.openAttribute ("METADATA");
  H5::VarLenType type=metadata.getVarLenType ();
  hvl_t varlen;
  metadata.read(type, &varlen);

How do I find out what type the VarLenType is based on? I have tried
getSuper(), getTag(), fromClass(), and operator==(), and none of them
seem to work for me. Are there any examples of how to introspectively
figure out what the type is?

Thank you,
Walter Landry

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Walter_Landry · September 25, 2015, 1:45pm

Thank you. That works for the attribute and gave me the necessary
hint for the VarLenType. To get the type that the VarLenType is based
on, I can run DataType::getSuper().getClass(). Then to actually
construct the type (for example, if it is a CompType), then I can use
DataType::getSuper().getClass().getId() in the CompType constructor.

Cheers,
Walter Landry

···

Binh-Minh Ribler <bmribler@hdfgroup.org> wrote:

Hello Walter,

Would AbstractDs::getTypeClass() give you the information you need?

bmribler · September 25, 2015, 5:31pm

That's good! Thanks, Walter!