(C++) CountNonZeroPositives

 

Code snippet to count the number of non-zero positive values in a std::vector.

 

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#include <algorithm #include <functional> #include <vector> //From http://www.richelbilderbeek.nl/CppCountNonZeroPositives int CountNonZeroPositives(const std::vector<int>& v) {  return std::count_if(     v.begin(),     v.end(),     std::bind2nd(std::greater<int>(),0)); }

 

 

 

 

 

CountNonZeroPositives test

 

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#include <cassert> int main() {   std::vector<int> v;   v.push_back(-3); assert(CountNonZeroPositives(v)==0);   v.push_back(-2); assert(CountNonZeroPositives(v)==0);   v.push_back(-1); assert(CountNonZeroPositives(v)==0);   v.push_back( 0); assert(CountNonZeroPositives(v)==0);   v.push_back( 1); assert(CountNonZeroPositives(v)==1);   v.push_back( 2); assert(CountNonZeroPositives(v)==2);   v.push_back( 3); assert(CountNonZeroPositives(v)==3);   v.push_back( 4); assert(CountNonZeroPositives(v)==4); }