Question

I have a member function in my base class which takes argument by reference:

// Base
template<class Data, class Variable_Type = double>
class Parallel_Data
{
...
void FuncA(Data& data, int& Global_ID) 
{Data_Local.push_back(data); Local_To_Global_ID.push_back(Global_ID);};
}

// Derived
class Derived: public Parallel_Data<Atom_Placed>

The problem is when I try to call that function in the derived member functions

Push_Back_This_CPU(Atom_Placed(Position_Atom), Global_ID);

I get following error

no known conversion for argument 1 from ‘Atom_Placed’ to ‘Atom_Placed&’

I am just trying to pass the argument by reference and don’t know why it wants to convert?

Answer 1

Temporaries like Atom_Placed(Position_Atom) cannot bind to non-const references such as the parameter Atom_Place&. The reason is that they are temporary objects and will die any moment now.

You could make a local variable of type Atom_Placed and pass that to the function Push_Back_This_CPU

Atom_Placed tmp(Position_Atom);
Push_Back_This_CPU(tmp, Global_ID);