I want to use the *create_mass_matrix* and *create_laplace_matrix* 
functionality of MatrixCreator namespace. The function prototype here 
requires to pass a pointer (which is by default 0 meaning that there is no 
variable coefficient associated with variable or laplace of variable) to a 
function object. I want to build the mass/laplace matrices taking in 
account the constraints so I pass the ConstraintMatrix argument as the last 
argument of the function. Code snippet:

QGauss<dim>(fe.degree+1), mass_matrix, ________, constraints);

Here dof_hadler, mass_matrix and constraints are appropriate objects as the 
name suggests. I don't have the variable coefficient/s so I need to know 
what to pass in the blank space which requires a pointer argument as 
mentioned above?

Thank you

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