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How to access protected variable?

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Old   April 15, 2014, 01:21
Default How to access protected variable?
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Manjunath Reddy
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Hiiii,

While making Ldumatrix.C in which is in test folder. I'm getting error with this lines


UEqnp.addBoundaryDiag(U3Eqnp.diag(), 0);
UEqnp.addBoundarySource(U3Eqnp.source(), false);

That is
/opt/openfoam222/src/finiteVolume/lnInclude/fvMatrix.C:150:6: error: ‘void Foam::fvMatrix<Type>::addBoundarySource(Foam::Fiel d<Type>&, bool) const [with Type = Foam::Vector<double>]’ is protected

which is showing addBoundarySource is protected how to access that please help me...

Regards
Manjunath
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Old   October 22, 2015, 07:05
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Hi Manjunath,

I have the same problem when accessing protected variables with addBoundaryDiag and addBoundarySource.

Did you find any information on how to solve it?

Regards,

--CME



Quote:
Originally Posted by manju819 View Post
Hiiii,

While making Ldumatrix.C in which is in test folder. I'm getting error with this lines


UEqnp.addBoundaryDiag(U3Eqnp.diag(), 0);
UEqnp.addBoundarySource(U3Eqnp.source(), false);

That is
/opt/openfoam222/src/finiteVolume/lnInclude/fvMatrix.C:150:6: error: ‘void Foam::fvMatrix<Type>::addBoundarySource(Foam::Fiel d<Type>&, bool) const [with Type = Foam::Vector<double>]’ is protected

which is showing addBoundarySource is protected how to access that please help me...

Regards
Manjunath
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Old   October 22, 2015, 09:06
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Matvey Kraposhin
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Quote:
Originally Posted by manju819 View Post
Hiiii,

While making Ldumatrix.C in which is in test folder. I'm getting error with this lines


UEqnp.addBoundaryDiag(U3Eqnp.diag(), 0);
UEqnp.addBoundarySource(U3Eqnp.source(), false);

That is
/opt/openfoam222/src/finiteVolume/lnInclude/fvMatrix.C:150:6: error: ‘void Foam::fvMatrix<Type>::addBoundarySource(Foam::Fiel d<Type>&, bool) const [with Type = Foam::Vector<double>]’ is protected

which is showing addBoundarySource is protected how to access that please help me...

Regards
Manjunath
1) Add friend functions or classes to the source code
Or
2) Create a nested class which inherits base class (fvMatrix)
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Old   October 22, 2015, 09:31
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Quote:
Originally Posted by mkraposhin View Post
1) Add friend functions or classes to the source code
Or
2) Create a nested class which inherits base class (fvMatrix)
thanks for your answer mkraposhin

Undortunately, my minimal C++ skills are not enopugh to understand it.

For this very simple example that does not compile
Quote:
// Define a matrix that contains the coefficients of the Laplacian
tmp<fvScalarMatrix> TEqnLaplaciano
(
fvm::laplacian(DT,T)
);

// Add BC contribution to matrix diagonal
scalarField& diag = TEqnLaplaciano().diag();
TEqnLaplaciano().addBoundaryDiag(diag,0);
Could you please let me know which code lines to insert to add a friend function that works.

Thanks in advance for youe help.

Regards,

--Carlos
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Old   October 22, 2015, 09:51
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Matvey Kraposhin
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In both cases it is not a trivial task:

1) In the first case you must declare any some function like
Quote:
void function1 ();
then you must put its declaration as friend to the declaration of fvMatrix class:
Quote:
protected:
void function1 ();
then you must recompile all libraries and binaries, that are using fvMatrix class

2) In the second case you can use inheritace mechanism:
Quote:
template<class T>
myClass : public fvMatrix<T>
{
}

Any way, you will need a good knowledge of C++
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Old   October 22, 2015, 10:17
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thanks again mkraposhin
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