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exponential.hh
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Sat, May 4, 10:28

exponential.hh
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/**
* @file
*
* @author Lucas Frérot <lucas.frerot@epfl.ch>
*
* @section LICENSE
*
* Copyright (©) 2018-2021 EPFL (Ecole Polytechnique Fédérale de
* Lausanne) Laboratory (LSMS - Laboratoire de Simulation en Mécanique des
* Solides)
*
* Expolit is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* Expolit is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
* more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Expolit. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef EXPONENTIAL_HH
#define EXPONENTIAL_HH
#include "types.hh"
#include "operations.hh"
#include <cmath>
#include <ostream>
#include <iostream>
namespace expolit {
namespace detail {
// Necessary for proper dispatch
using std::exp;
struct ExponentialFunctor {
template <typename Val>
constexpr auto operator()(Val&& v) const {
return exp(v); // Should dispatch in case expression is passed
}
};
}
/**
* @brief Exponential expression
*
* Handles exponential of arbitrary expression
*/
template <typename T>
using Exponential = UnaryOperation<T, detail::ExponentialFunctor>;
template <typename Derived>
constexpr auto exp(const Expression<Derived>& e) {
return Exponential<std::remove_cv_t<Derived>>(e.downcast());
}
/* -------------------------------------------------------------------------- */
/* Output */
/* -------------------------------------------------------------------------- */
template <typename T>
std::ostream& operator<<(std::ostream& os, const Exponential<T>& e) {
os << "exp(" << e.expression << ")";
return os;
}
} // namespace expolit
#endif

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