brent.h

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#include <vector>
namespace shogun
{
#ifndef DOXYGEN_SHOULD_SKIP_THIS
class func_base{
public:
  virtual double operator() (double) = 0;
};

class monicPoly : public func_base {
public:
  std::vector<double> coeff;
  virtual double operator() (double x);
// constructors:
  monicPoly(const size_t degree)
   : coeff(degree) {}
  monicPoly(const std::vector<double>& v)
   : coeff(v) {}
  monicPoly(const double* c, size_t degree)
   : coeff(std::vector<double>(c, c+degree)) {}
};

class Poly : public func_base {
public:
  std::vector<double> coeff;    // a vector of size nterms i.e. 1+degree
  virtual double operator() (double x);
// constructors:
  Poly(const size_t degree)
   : coeff(1+degree) {}
  Poly(const std::vector<double>& v)
   : coeff(v) {}
  Poly(const double* c, size_t degree)
   : coeff(std::vector<double>(c, 1+c+degree)) {}
};

double glomin ( double a, double b, double c, double m, double e, double t,
  func_base& f, double &x );
double local_min ( double a, double b, double t, func_base& f,
  double &x );
double local_min_rc ( double &a, double &b, int &status, double value );
double r8_abs ( double x );
double r8_epsilon ( );
double r8_max ( double x, double y );
double r8_sign ( double x );
void timestamp ( );
double zero ( double a, double b, double t, func_base& f );
void zero_rc ( double a, double b, double t, double &arg, int &status,
  double value );

// === simple wrapper functions
// === for convenience and/or compatibility
double glomin ( double a, double b, double c, double m, double e, double t,
  double f ( double x ), double &x );
double local_min ( double a, double b, double t, double f ( double x ),
  double &x );
double zero ( double a, double b, double t, double f ( double x ) );
#endif
}