tbb_preduce_01_t.cc File Reference

#include "tbb/tbb.h"
#include <algorithm>
#include <cassert>
#include <iostream>
#include <iterator>
#include <numeric>

Go to the source code of this file.

Classes
class	Meanie
class	Minnie

Typedefs
typedef tbb::blocked_range< typename std::vector< double >::const_iterator >	br_t

Functions
int	main ()

Typedef Documentation

typedef tbb::blocked_range<typename std::vector<double>::const_iterator> br_t

Definition at line 18 of file tbb_preduce_01_t.cc.

Function Documentation

int main

(

)

Definition at line 55 of file tbb_preduce_01_t.cc.

{
  // Setup.
  size_t const n = 500000;
  double const val = 27.125; // Exactly representable as a double in IEEE.
  std::vector<double> v(n, val);
  // Mean.
  Meanie m;
  tbb::parallel_reduce(br_t(v.cbegin(), v.cend()), m);
  assert(m.count() == n);
  assert(m.result() == val);
  // Setup for min.
  std::vector<double>::difference_type const loc = 47856;
  double const minval = 22.3;
  v[loc] = minval;
  // Min.
  Minnie mincalc;
  tbb::parallel_reduce(br_t(v.cbegin(), v.cend()), mincalc);
  assert(mincalc.valid() && std::distance(v.cbegin(), mincalc.min()) == loc);
  assert(*mincalc.min() == minval);
}