sl@0: #ifndef _unary_h
sl@0: #define _unary_h
sl@0: #include <cmath>
sl@0: #include <cfloat>
sl@0: #include <functional>    //*TY 12/26/1998 - added to get unary_function
sl@0: 
sl@0: #if !defined (STLPORT) || defined (_STLP_USE_NAMESPACES)
sl@0: using std::unary_function;
sl@0: #endif
sl@0: 
sl@0: struct odd : public unary_function<int, bool>
sl@0: {
sl@0: //  odd() {}
sl@0:   bool operator()(int n_) const { return(n_ % 2) == 1; }
sl@0: };
sl@0: 
sl@0: struct positive : public unary_function<int, bool>
sl@0: {
sl@0:   typedef int argument_type;
sl@0:   typedef bool result_type;
sl@0: //  positive() {}
sl@0:   bool operator()(int n_) const { return n_ >= 0; }
sl@0: };
sl@0: 
sl@0: struct square_root : public unary_function<double, double>
sl@0: {
sl@0:   typedef double argument_type;
sl@0:   typedef double result_type;
sl@0:   square_root() {}
sl@0:   square_root(const square_root &) {}
sl@0:   double operator()(double x_) const
sl@0:   { return ::sqrt(x_); }
sl@0: };
sl@0: #endif // _unary_h