03-cxx-style-ref.cxx File Reference

Include dependency graph for 03-cxx-style-ref.cxx:

Go to the source code of this file.

Functions
void	initialize (std::vector< double > &x)
	The class std::vector contains size information and can be instantiated for any data type. More...
double	sum_elements (std::vector< double > &x)
int	main ()

Function Documentation

void initialize

(

std::vector< double > &

x

)

The class std::vector contains size information and can be instantiated for any data type.

Here we do it for double. We pass a reference to the vector to the functions using it.

Examples:

03-cxx-style-ref.cxx.

Definition at line 15 of file 03-cxx-style-ref.cxx.

{
  const int n=x.size();
  for (int i=0;i<n;i++) x[i]= 1.0/(double)(1+n-i);
}

double sum_elements

(

std::vector< double > &

x

)

Examples:

03-cxx-style-ref.cxx.

Definition at line 21 of file 03-cxx-style-ref.cxx.

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

Here is the call graph for this function:

int main

(

void

)

Examples:

03-cxx-style-ref.cxx.

Definition at line 28 of file 03-cxx-style-ref.cxx.

{
  const int n=12345678;
  
  // Instantiate a vector of doubles of given size.
  // The class object itself is placed on the stack,
  // but the data is placed on the heap.
  std::vector<double> x(n);

  initialize(x);
  double s=sum_elements(x);
  printf("sum=%e\n",s);
  
  // When leaving this scope, x is destroyed, and with
  // this also the memory on the heap is freed.
  return 0;
}

Here is the call graph for this function: