integration.cpp

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#include <itpp/base/math/integration.h>

namespace itpp
{
 
//wrapper to convert double(*f)(double) to function object
class Integrand_Wrapper
{
  typedef double(*Ftn)(double);
  Ftn _f;
public:
  explicit Integrand_Wrapper(Ftn f): _f(f) {}
  double operator()(double x) const {return _f(x);}
};
 
 
template double quad(Integrand_Wrapper, double, double, double);
template double quadl(Integrand_Wrapper, double, double, double);
 
//--------------------- quad() ----------------------------------------
double quad(double(*f)(double), double a, double b,
            double tol)
{
  return quad(Integrand_Wrapper(f), a, b, tol);
}
 
//--------------------- quadl() ----------------------------------------
double quadl(double(*f)(double), double a, double b, double tol)
{
  return quadl(Integrand_Wrapper(f), a, b, tol);
}
 
 
} // namespace itpp