40 lines
837 B
C++
40 lines
837 B
C++
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#include <iostream>
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#include "utils.hpp"
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#include "compile_time_derivative.hpp"
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using std::cout;
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using std::endl;
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// x is the unknown
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expression<terminal<unknown>::type> const x;
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// A transform works as a functor
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Derivative const derivative;
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template<typename T>
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T fct(const T & x) {
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return (3)*x*x + (2)*x - (3) + (1)/x;
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}
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template<typename T>
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T dfct(const T & x) {
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return (6)*x + (2) - (1)/(x*x);
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}
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// The file must be compiled with -O0 because with -O2 and up
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int main()
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{
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auto func = (3*x*x + 2*x - 3 + 1./x);
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// auto func = fct(x);
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auto dfunc = derivative(func);
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cout.precision(16);
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for(double i = 0.1 ; i < 2. ; i+=.1)
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std::cout << func(i) << "\t" << fct(i) << '\n';
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for(double i = 0.1 ; i < 2. ; i+=.1)
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std::cout << func(i) << "\t" << fct(i) << "\t" << dfunc(i) << "\t" << dfct(i) << '\n';
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return 0;
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}
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