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#include <cassert>
#include <iostream>
#include <string>
#include <cmath>
#include <functional>
// Works with std::function !
//std::function<double(double)> set_unary_operation(const std::string& unary)
auto set_unary_operation(const std::string& unary)
{
if(unary == "EXP")
return [](const double& x){ return std::exp(x);};
if(unary == "LOG")
return [](const double& x){ return std::log10(x);};
if(unary == "_LN")
return [](const double& x){ return std::log(x);};
if(unary == "ABS")
return [](const double& x){ return std::abs(x);};
return [](const double& x){return x;};
}
bool is_equal(double&& value, double&& test)
{
double epsilon = 0.0000001;
return (value-epsilon < test) && (value+epsilon > test);
}
int main()
{
// TEST OPERATOR --------------------------------------------------------------------------
{
std::string in = "EXP";
auto f = set_unary_operation(in);
std::cout << "f = EXP ; f(1) = "<< f(1) << "; f(2.5) = " << f(2.5) << std::endl;
assert(is_equal(f(1) , 2.71828182));
assert(is_equal(f(2.5), 12.1824939607));
}
return 0;
}
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