Create a common class/structure to store histogram definition.

[jgalan]

I am now retrieving histogram like definition inside TRestComponent. Something similar is done inside TRestDataSetOdds, to fill in the following metadata members:

    /// Vector containing different obserbable names
    std::vector<std::string> fObsName;

    /// Vector containing different obserbable ranges
    std::vector<TVector2> fObsRange;

    /// Vector containing number of bins for the different observables
    std::vector<int> fObsNbins;

Perhaps it would be interesting to create a TRestHistDefinition class? Or perhaps we could use directly a TH1D? Perhaps we could implement inside TRestMetadata::InitFromConfigFile the reading of a TH1D instance?

So we could define inside TRestMetadata:

std::vector <TH1D> fHistos;

Then, inside any metadata class we can create definitions as:

<TH1D varName="h1" range="(0,100)" bins="10" />
<TH1D varName="h2" range="(0,300)" bins="30" />
<TH1D varName="h3" range="(0,500)" bins="50" />

which are created inside InitFromConfigFile.

What do you think about something like this?

@juanangp @nkx111 @lobis

[jgalan]

The main purpose of the TH1D class is to store those metadata members, varName, range and bins. Thats why perhaps a dedicated metadata class, such as TRestHist is more clear.