Error correction

[statesman]

hi,
please help me correcting this error or at least suggest some.
error C3892:
'sofa::helper::vector<T>::operator []' : you cannot assign to a
variable that is const
1> with
1> [
1> T=sofa::defaulttype::Vec<1,double>
1> ]


The error is for the commented line below:


if(_mstate->getSize()>5)
{
(*_mstate->getX0())[0].x() = thetaX; //error here
(*_mstate->getX0())[1].x() = thetaZ;
(*_mstate->getX0())[2].x() = state.toolRoll;
(*_mstate->getX0())[3].x() = state.toolDepth*Scale.getValue();
(*_mstate->getX0())[4].x() =state.opening;
(*_mstate->getX0())[5].x() =state.opening;
}

So far what I can understand is that *_mstate->getX0 is returning a constant type and the line is trying to assign to a constant.I don't know if I am totally correct.But I am looking for an answer which need not to modify any of the operator related function or getX0 function.
If not possible please at least say it to me.

thanks

[kbw]

Without knowing what type your things are, we can't help.

[yUq2Nwbp]

what returns getX0() ??

[statesman]

Sorry for insufficient information

virtual const VecCoord* getX0() const = 0;

this is the function prototype.I guess it'll help.
*_mstate is a pointer to VecCoord type which is nearly same as a vector.

and thetax is a double.

[yUq2Nwbp]

i think error is here (*_mstate->getX0())[0]........as i understood you have abstract class and other classes which inherit from your abstract class.....(*_mstate->getX0())[0] is object but your base class is abstract so you can't create object.....try refer to x() like this pointer->x().......

[statesman]

Thanks for your reply but it doesnt help.

I think I should do some more research on this.
May be then I will be able to make it more clear to you all.

[kbw]

You could start by showing what the type of _mstate is.

[statesman]

Now I think I can explain my problem better

if(_mstate->getSize()>5)
{
(*_mstate->getX0())[0].x() = thetaX; //error here
(*_mstate->getX0())[1].x() = thetaZ;
(*_mstate->getX0())[2].x() = state.toolRoll;
(*_mstate->getX0())[3].x() = state.toolDepth*Scale.getValue();
(*_mstate->getX0())[4].x() =state.opening;
(*_mstate->getX0())[5].x() =state.opening;
}


////////////////////////////////////////////////////////////////////////////////

Here _mstate is a pointer to a BaseMechanical state object

core::componentmodel::behavior::BaseMechanicalState* _mstate;

_mstate has been typecasted to MechanicalState pointer (srry if some terms are wrong)

this->_mstate = dynamic_cast<core::behavior::MechanicalState<Vec1dTypes>*> (context->getMechanicalState());

MechanicalState is inherited from BaseMechanicalState class

class MechanicalState : public BaseMechanicalState

BaseMechanical state contains VecCoord type members which which contains a set of vectors.

getX0 is defined in MechanicalState class

virtual VecCoord* getX0() = 0; 

virtual VecCoord* getX0() = 0; 

the operator is defined as follows:

const_reference operator[](size_type n) const

reference operator[](size_type n) 

// here I am not getting it
x() is defined as

const real& sofa::defaulttype::Vec< N, real >::x( )  const

And the error message is

error C3892: 'sofa::helper::vector<T>::operator []' : you cannot assign to a variable that is const
1>        with
1>        [
1>            T=sofa::defaulttype::Vec<1,double>
1>        ]

Now I think I am clear enough.I tried to do lot of things but I am stuck here.
Could you please help?

[yUq2Nwbp]

does your BaseMechanicalState class inherit from VecCoord??

[statesman]

No, the parent of BaseMechanicalState contain VecCoord type member variables.

[yUq2Nwbp]

statesman i can't understand what happens but i can give advance to you.......comment all the parts of your program that you think work correct.....it would facilitate your work to find error...