04-cxx-style-sharedptr.cxx File Reference

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Functions
void	initialize (std::shared_ptr< std::vector< double >> x)
double	sum_elements (std::shared_ptr< std::vector< double >> x)
int	main ()

Function Documentation

void initialize

(

std::shared_ptr< std::vector< double >>

x

)

Examples:

04-cxx-style-sharedptr.cxx.

Definition at line 14 of file 04-cxx-style-sharedptr.cxx.

{
  // Here we need to dereference the smart pointer
  // in order to access the data. This looks a  bit
  // confusing...
  const int n=x->size();
  for (int i=0;i<n;i++) (*x)[i]= 1.0/(double)(1+n-i);
}

double sum_elements

(

std::shared_ptr< std::vector< double >>

x

)

Examples:

04-cxx-style-sharedptr.cxx.

Definition at line 23 of file 04-cxx-style-sharedptr.cxx.

{
  double sum=0;
  for (int i=0;i<x->size();i++)sum+=(*x)[i];
  return sum;
}

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int main

(

void

)

Examples:

04-cxx-style-sharedptr.cxx.

Definition at line 30 of file 04-cxx-style-sharedptr.cxx.

{
  const int n=12345678;

  // This declares  and creates a shared pointer from an object
  // allocated with new. Quite cumbersome...
  std::shared_ptr<std::vector<double>> x=std::shared_ptr<std::vector<double>>(new std::vector<double>(n));
  initialize(x);
  double s=sum_elements(x);
  printf("sum=%e\n",s);

  // The shared pointer is destroyed, reference counter decremented
  // and, as it becomes 0, the allocated memory is released.
  return 0;
}

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