det.h

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#ifndef _BAMGDET_H_
#define _BAMGDET_H_
 
#include "./include.h"
 
namespace bamg {
 
   long long inline det(const I2 &a,const I2 & b,const I2 &c){
      long long bax = b.x - a.x ,bay = b.y - a.y; 
      long long cax = c.x - a.x ,cay = c.y - a.y; 
      return  bax*cay - bay*cax;
   }
 
}
#endif