#ifndef _unary_h

#define _unary_h

#include <cmath>

#include <cfloat>

#include <functional>    //*TY 12/26/1998 - added to get unary_function

#if !defined (STLPORT) || defined (_STLP_USE_NAMESPACES)

using std::unary_function;

#endif

struct odd : public unary_function<int, bool>

{

//  odd() {}

  bool operator()(int n_) const { return(n_ % 2) == 1; }

};

struct positive : public unary_function<int, bool>

{

  typedef int argument_type;

  typedef bool result_type;

//  positive() {}

  bool operator()(int n_) const { return n_ >= 0; }

};

struct square_root : public unary_function<double, double>

{

  typedef double argument_type;

  typedef double result_type;

  square_root() {}

  square_root(const square_root &) {}

  double operator()(double x_) const

  { return ::sqrt(x_); }

};

#endif // _unary_h