C/C++ DIM AT

[Patrice Terrier]

What is the best way to duplicate PB's DIM AT in C/C++ ?

...

[Charles Pegge]

Hi Patrice,

Arrays can be mapped onto any space using a pointer variable and some casting. You just need to find a suitable encapsulation that matches your syntax requirements.



  // ARRAY OVERLAY

  #include <stdio.h>
  #include <stdlib.h>


int main()
  {
    int* m=(int*) malloc(1024); //heapspace
    float*va=(float*) m;            //map float array to m
    va[1]=10.0;                        //test
    printf("%f\n",va[1]);
    free(m);
  }

[Patrice Terrier]

Thank you Charles, that's simple indeed.

By the way moving my librairies  to C/C++ i can see all kind of benefits, including easy use of the latest technology, and get rid of having to translate all headers before starting to write anything.

I am amazed by the size of the resulting 64-bit DLL when everything is based on the flat API.

...

[James C. Fuller]

Patrice,
  I fear you may be missing some very useful features of the C11 spec by using VS 2010. Even VS 2012 is still missing a lot.
MinGW just released version 4.8 today which includes all but 2.
The range based for loops , and the auto type inference feature as well as direct assignments to containers are very useful.
I have fallen quite heavily for vectors and intend to put together a bc9 tutorial on thier uses as well as examples of the other containers.

Code Select Expand



#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;

int main ()
{

// this is a C11 addition
  vector<wstring> s  ={ L"one", L"two", L"three", L"four", L"five"};

  cout<<"s contains"<<endl;
  for(auto it=s.begin();it!=s.end();++it)
    {
      wcout<<" "<<*it;
    }

  cout<<endl;
  cout<<"in reverse"<<endl;
  for(auto rit=s.rbegin();rit!=s.rend();++rit)
    {
      wcout<<" "<<*rit;
    }
  cout<<endl;

cout<<"range-based for loop"<<endl;

for ( auto it : s)
    {
      wcout<<" "<<it;
    }
  cout<<endl;

// sort it
  std::sort(s.begin(),s.end());

// display it
for ( auto it : s)
    {
      wcout<<" "<<it;
    }

  cout<<endl;
  return 0;
}



output:

Code Select Expand


s contains
one two three four five
in reverse
five four three two one
range-based for loop
one two three four five
five four one three two


[Patrice Terrier]

James

My first target will be Visual Studio programmers 

...

[Theo Gottwald]

Thats a much more interesting market :-)
But you knew it before!

[Mike Stefanik]

Patrice,
  I fear you may be missing some very useful features of the C11 spec by using VS 2010.

While handy, you pay a price for convenience. If he wants an extra 100-200K added to his DLL, then pulling in <iostream> and friends is certainly the way to go about it.