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Asked: 2026-05-31T16:54:14+00:00

I’m attempting to call a function in the ROOT plotting package that accepts three

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I’m attempting to call a function in the ROOT plotting package that accepts three variables. The relevant section in my code is:

int xwidth=0,ywidth=0;
Bool_t useangle=0;
vIt->GetBoundingBox(xwidth,ywidth,useangle);

where vIt is an iterator to an object with GetBoundingBox as a class member function. (Bool_t is just a typedef that ROOT uses).

Now, when I compile, I get the following error from g++:

error: no matching function for call to ‘TText::GetBoundingBox(int&, int&, Bool_t&)’
/home/bwhelan/Programs/MODIFIED//External/root/5.30.00/include/root/TText.h:57: note:   candidates are: virtual void TText::GetBoundingBox(UInt_t&, UInt_t&, Bool_t)

My question is why is useangle being passed by reference here, instead of by value? I simply cannot figure it out.

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1 Answer

  1. Editorial Team

    The problem isn’t that the bool is passed by reference but that you line

    int xwidth=0,ywidth=0;

    Should be of type UInt_t

    UInt_t xwidth=0u,ywidth=0u;

    The compiler doesn’t know how you want to pass the variable to function with the unkown overload so it just assumes you meant by ref.

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