[Dev-C++] stl accumulate

[<h.r...@gm...>]

Hi List,

i tried to replace the following code:

typedef vector<double>::iterator it;

   for(it i = TMW.begin(); i != TMW.end(); ++i) {
      sx  += *i;
      sxx += sqr(*i);
    } // for it

 with:

   sx = accumulate(TMW.begin(), TMW.end(), 0.0);
   sxx = accumulate(TMW.begin(), TMW.end(), 0.0, sqr);
 
sqr (same for both versions):
namespace hr_math {

  template<class T> 
  inline T sqr(T x) { return x * x; }

}

sx and sxx are double. 
If i compile it i get the error messages:

71 E:\dev\dev-c++\proj2\procabi.cpp
no matching function for call to `accumulate(

What is wrong with my code ? Similar code can be found in several books.
Thanks  for your help

greetings
Horst



-- 
Horst Rößner
Postf. 1802
52205 Stolberg

ICQ ID #74808448
h.r...@gm...
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