Aihong,
just make the Or of the two options:
myMap->Write("myMap", TObject::kOverwrite | TObject::kSingleKey);
Rene Brun
Aihong Tang wrote:
>
> Hi,
>
> I am trying to save a TMap object in to a TFile.
> I want overwrite the existing object in the file and I also want the map
> to be saved as a single key.
>
> In the Object::Write(), I found:
>
> // The option can be a combination of:
> // kSingleKey and kOverwrite
> // Using the kOverwrite option a previous key with the same name is
> // overwritten.
> // The kSingleKey option is only used by TCollection::Write() to write
> // a container with a single key instead of each object in the
> container
> // with its own key.
>
> My question is how to combine these two options?
> Should I try myMap->Write("myMap", TObject::kOverwrite &&
> TObject::kSingleKey) ?
>
> Thanks!
>
> Aihong
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