1 #ifndef _unary_h 2 #define _unary_h 3 #include <cmath> 4 #include <cfloat> 5 #include <functional> //*TY 12/26/1998 - added to get unary_function 6 7 #if !defined (STLPORT) || defined (_STLP_USE_NAMESPACES) 8 using std::unary_function; 9 #endif 10 11 struct odd : public unary_function<int, bool> { 12 bool operator()(int n_) const { return(n_ % 2) == 1; } 13 }; 14 15 struct positive : public unary_function<int, bool> { 16 bool operator()(int n_) const { return n_ >= 0; } 17 }; 18 19 struct square_root : public unary_function<double, double> { 20 double operator()(double x_) const 21 { return ::sqrt(x_); } 22 }; 23 #endif // _unary_h 24
