Get material in detector construction from other file

[faca87]

Hello, I defined the acrylic material in a local material table file:
MGGerdaLocalMaterialTable.cc (4.9 KB)
MGGerdaLocalMaterialTable.hh (2.7 KB)

I’ve to get the acrylic material in the detector construction

G4Material* Acrylic = G4Material::GetMaterial("Acrylic");

B1DetectorConstruction.cc (60.0 KB)

but I get the error

how to get the material definition from the local material file?

[mkelsey]

Where does MGGerdaLocalMaterials::CreateMaterials() get called? If that function isn’t called, then none of the code in the function ever gets executed.

[faca87]

Hello @mkelsey how to call a function from an external file?

[mkelsey]

This is a general C++ question. C++ is a compiled language. I recommend looking up some basic C++ programming resources in order to understand how to program in C++.

[faca87]

Sincerly I know that in C++ to call a function from another file I’ve:

1. To define the function in the hh file
2. To include the the hh file in the wanted file.
3. To call the function in the wanted file in this way:

function();

but it doesn’t work. Ie.

1. In MGGerdaLocalMaterialTable.hh there is the definition of the function

class MGGerdaLocalMaterialTable 
{
public:

  //default constructor
  MGGerdaLocalMaterialTable();

  //destructor
  ~MGGerdaLocalMaterialTable();

  //public interface

  void CreateMaterials();
  void AddNewMaterial();

2. In B1detectorconstruction.cc I included

``#include “MGGerdaLocalMaterialTable.hh”`

2. In B1detectorconstruction.cc I called the function
   MGGerdaLocalMaterialTable::CreateMaterials(); `

but I get the error

the traslation of the error is : not valid call of member of no static function

MGGerdaLocalMaterialTable.hh (2.7 KB)
B1SteppingAction.cc (3.1 KB)

Please, can you say me how to fix it?

[mkelsey]

You don’t have that class defined with static functions. So you need to instantiate the object, then call the function via the instantiated object.

[faca87]

Thank you, I did it!