CODEWITHSUNDEEP
c++memory-leakseigendelete-operatoreigen3
HiroIshida
HiroIshida

Reputation: 1603

Does Eigen's Matrix delete dynamically-allocated data when it's lifetime is over?

Please consider the procedure in the following snippet. First dynamically create data, and then create Eigen matrix using the data. In this case, the matrix will release the memory of data when it's lifetime is over?

I guess in the Eigen::Map operation, pointer is copied and actual elements of data is not coppied. Thus, hopefully, matrix release the memory of data.

#include<Eigen/Core>
using namespace Eigen;
int main(){
  double* data = new double [6];
  double* itr = data;
  for(int i=0; i<6; i++){
    *(itr++) = i;
  }
  auto m = Map<MatrixXd>(data, 2, 3);
}

Upvotes: 1

Views: 685

Answers (1)

CPPCPPCPPCPPCPPCPPCPPCPPCPPCPP
CPPCPPCPPCPPCPPCPPCPPCPPCPPCPP

Reputation: 1025

The matrix will not release the memory of data when it's lifetime is over.

There is no any way for Eigen to guess where your pointer is located (Stack/Heap or wherever), and how it is allocated.

Upvotes: 2

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