[Dev-C++] stl accumulate question

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

Hi list,

i want to replace the following code:

typedef vector<double>::iterator it;
  
for(it i = TMW.begin(); i != TMW.end(); i++) { 
  sx   += *i;
  sxx += sqr(*i); 
}
    
with
  
    sx  = accumulate(TMW.begin(), TMW.end(), 0.0);
    sxx = accumulate(TMW.begin(), TMW.end(), 0.0, sqr);
[...]

def of sqr:

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

but sxx = .... does not compile.

The error message:
55 E:\dev\dev-c++\proj2\procabi.cpp
no matching function for call to `accumulate (double *, double *, double,
{unknown type})'

Why that ???

Thanks in advance

greetings
Horst    

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