85 lines
2.4 KiB
C++
Executable File
85 lines
2.4 KiB
C++
Executable File
/*
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* Copyright (c) 2015, PHILIPPE TILLET. All rights reserved.
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*
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* This file is part of ISAAC.
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*
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* ISAAC is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#ifndef ISAAC_CPP_FUNCTIONAL_HPP
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#define ISAAC_CPP_FUNCTIONAL_HPP
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#include <type_traits>
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#include <tuple>
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namespace isaac
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{
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namespace cpp
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{
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template <typename T>
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struct function_traits
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: public function_traits<decltype(&T::operator())>
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{};
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// For generic types, directly use the result of the signature of its 'operator()'
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template <typename ClassType, typename ReturnType, typename... Args>
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struct function_traits<ReturnType(ClassType::*)(Args...) const>
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// we specialize for pointers to member function
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{
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enum { arity = sizeof...(Args) };
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// arity is the number of arguments.
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typedef ReturnType result_type;
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template <size_t i>
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struct arg
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{
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typedef typename std::tuple_element<i, std::tuple<Args...>>::type type;
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// the i-th argument is equivalent to the i-th tuple element of a tuple
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// composed of those arguments.
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};
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};
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template<class U, class FN, class V>
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V forward_dyncast(U const & x, FN const & fn, V const &backup)
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{
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typedef typename function_traits<FN>::template arg<0>::type RT;
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typedef typename std::remove_reference<RT>::type T;
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if(T const * p = dynamic_cast<T const *>(&x))
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return fn(*p);
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return backup;
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}
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template<class U, class FN>
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void forward_dyncast(U const & x, FN const & fn)
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{
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typedef typename function_traits<FN>::template arg<0>::type RT;
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typedef typename std::remove_reference<RT>::type T;
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if(T const * p = dynamic_cast<T const *>(&x))
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fn(*p);
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}
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template<class U, class FN>
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bool compare_if_same(U const & base, FN const & f)
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{ return cpp::forward_dyncast(base, f, false); }
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}
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}
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#endif
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