Size() on static arrays inside a class.

[forceface]

I've been trying to using the command .size() to get the size of the arrays instead of creating a variable which is the same size of the array. I'm manually putting in the values i want to use in the array so it wont make sense to define a variable for its size

#include <fstream>
#include <stdio.h>
#include <stdlib.h>
#include <iostream>
#include <vector>


using namespace std;

class Test {
  
  static  double hit_rate[];
  
  static  int fifo_width[];
  static int fsize;
  static int psize;  
  } 
 public:
  Test();
  ~Test(){};      
  //some functions
};




#include "FrontFifo.h" 

#include "SecondFifo.h"

#include "call.h"



    ////declaring static variables
    double Test::hit_rate[]={.5,.2,.4};
    int Test::fifo_width[]={5,10,20};
    int Test::fsize=fifo_width.size();
    int Test::psize=hit_rate.size();
  

int main() {
 srand( time(NULL) );/////seed random number generator to time
 Test();  

}

the error is:
38 request for member `size' in `Test::fifo_width', which is of non-class type `int[1]'

and

39 request for member `size' in `Test::hit_rate', which is of non-class type `double[1]'

[vlad from moscow]

There is no such a function as size() for arrays in C/C++. And an array is not a class. Arrays have no member functions.

[forceface]

aww thank you. I was looking at this http://www.cplusplus.com/reference/stl/array/size/ which seems to be wrong now. I instead used something like int Test::psize=sizeof(hit_rate)/sizeof(double);

[rollie]

That is reference to a stl container type "array", accessed via:

#include <array>

int main()
{
    std::array myarray;
    cout << myarray.size() << endl;
    return 0;
}

I could see how that might be confusing :)

[vlad from moscow]

@rollie
It is confusing only because you did not specify template arguments. Shall be for example

std::array<int, 10> myarray;

[rollie]

Obviously not what I meant; I could see how the documentation might be misleading. You think you are reading documentation for arrays, when you are actually reading documentation for an array class.

[forceface]

thanks for the help, it is much clearer now.