Exponentiation.hpp

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#ifndef SXEVAL_OPERATIONS_EXPONENTIATION_HPP
#define SXEVAL_OPERATIONS_EXPONENTIATION_HPP
 
#include "sxeval/AOperation.hpp"
#include <cmath>
 
 
/* DEFINITIONS */
 
namespace sxeval {
namespace operations {
 
template <typename T>
class Exponentiation : public AOperation<T> {
public:
    static constexpr const char* KEY = "^";
    static constexpr const int ARITY_MIN = 2;
    static constexpr const int ARITY_MAX = AOperation<T>::UNLIMITED_ARITY;
 
    inline Exponentiation(const std::vector<IInstruction<T>*>& args) :
        AOperation<T>(args) {}
 
    void execute() override;
 
    inline std::string toString() const override { return KEY; }
 
};
 
} /* namespace operations */
} /* namespace sxeval */
 
 
/* IMPLEMENTATIONS */
 
template <typename T>
constexpr const char* sxeval::operations::Exponentiation<T>::KEY;
 
template <typename T>
void sxeval::operations::Exponentiation<T>::execute() {
    this->_result = this->_args.front();
    for (size_t i = 1; i < this->_args.size(); ++i) {
        this->_result = static_cast<T>(std::pow(this->_result,
            this->_args[i].get()));
    }
}
 
#endif /* SXEVAL_OPERATIONS_EXPONENTIATION_HPP */