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pointer of scalar in openfoam

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Old   March 28, 2020, 05:11
Default pointer of scalar in openfoam
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Mehdi Baba Mehdi
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when I define a aray of a List by using dynamic memory allocation, the compiler throw errors which seem for List<scalar> we can not define dynamic array. If so, How is it possible to do it?
randomValue is an array generated by random generator library. and posX (-Y, -Z) are given scalars.

Code:
List<List<scalar>> injected;

List<scalar>* rndParticle = new List<scalar>[numberOfObject_];
double factorOfSafty = 1.5;
scalar minDist_ = 10;



for(int i = 0; i < numberOfObject_; ++i)
{          
      rndParticle->push_back(*(randomValue++));
      rndParticle->push_back(posX_); 
      rndParticle->push_back(posY_ - numberOfObject_ * minDist_ * factorOfSafty     / 2 + i * minDist_ * factorOfSafty);        
      rndParticle->push_back(posZ_ - numberOfObject_ * minDist_ * factorOfSafty     / 2 + i * minDist_ * factorOfSafty);
      injected.push_back(*rndParticle);
      ++rndParticle;
  }
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Old   March 28, 2020, 09:30
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class List is not a class from standard c++ library, it is merely a part of OF. There's no push_back() method in there. Use append() (https://cpp.openfoam.org/v3/a07589_source.html#l00097).
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Old   March 28, 2020, 11:28
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@zeppo Thanks a lot. Another problem I have is also converting scalar to int/double. Do you know how I can do it?
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Old   March 28, 2020, 14:50
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There's not need in conversion from scalar to double. It is done automatically. scalar is a typedef (or #define, need to check it out in the sources) for either double or float depending on the option (double by default) chosen at the stage of OF compilation. Use scalar in place of double wherever you can and you'll be just fine. IF you need to conver scalar (double) to int just do it in a regular way with possible loss of pressision:
Code:
scalar myScalar(...);
int myInt ((int)myScalar);
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Last edited by Zeppo; March 29, 2020 at 09:50. Reason: misprint corrected
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