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