derive.hpp

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// MIT License
//
// Copyright (c) 2020, The Regents of the University of California,
// through Lawrence Berkeley National Laboratory (subject to receipt of any
// required approvals from the U.S. Dept. of Energy).  All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// SOFTWARE.
 
/**
 * \file timemory/operations/types/derive.hpp
 * \brief Definition for various functions for derive in operations
 */
 
#pragma once
 
#include "timemory/operations/declaration.hpp"
#include "timemory/operations/macros.hpp"
#include "timemory/operations/types.hpp"
#include "timemory/utility/types.hpp"
 
namespace tim
{
namespace operation
{
//
//--------------------------------------------------------------------------------------//
//
//
//
//--------------------------------------------------------------------------------------//
//
template <typename Tp>
struct fold_derive;
 
template <template <typename...> class CompT, typename... C>
struct fold_derive<CompT<C...>>
{
public:
    TIMEMORY_DELETED_OBJECT(fold_derive)
 
    template <typename Up, typename Arg, typename... Args>
    fold_derive(bool& b, Up& obj, Arg&& arg, Args&&...)
    {
        if(!b)
            sfinae(b, obj, 0, std::forward<Arg>(arg));
    }
 
private:
    //  satisfies mpl condition and accepts arguments
    template <typename Up, typename Arg>
    auto sfinae(bool& b, Up& obj, int, Arg&& arg)
        -> decltype(obj.derive(arg.template get_component<C>()...), void())
    {
        b = obj.derive(arg.template get_component<C>()...);
    }
 
    template <typename Up, typename Arg>
    void sfinae(bool&, Up&, long, Arg&&)
    {}
};
//
//--------------------------------------------------------------------------------------//
//
//
//
//--------------------------------------------------------------------------------------//
//
template <typename Tp>
struct derive
{
    using type = Tp;
 
    TIMEMORY_DELETED_OBJECT(derive)
 
private:
    using derived_tuple_t                   = typename trait::derivation_types<Tp>::type;
    static constexpr size_t derived_tuple_v = std::tuple_size<derived_tuple_t>::value;
    template <size_t Idx>
    using derived_t = typename std::tuple_element<Idx, derived_tuple_t>::type;
 
public:
    template <typename... Args>
    explicit derive(type& obj, Args&&... args);
 
    template <typename Arg, size_t N = derived_tuple_v, std::enable_if_t<N != 0> = 0>
    explicit derive(type& obj, Arg&& arg)
    {
        bool b = false;
        sfinae(b, obj, make_index_sequence<N>{}, std::forward<Arg>(arg));
        if(!b)
            sfinae(obj, 0, 0, std::forward<Arg>(arg));
    }
 
    template <template <typename...> class BundleT, typename... Args>
    explicit derive(type& obj, BundleT<Args...>& arg)
    {
        bool           b = false;
        constexpr auto N = derived_tuple_v;
        sfinae(b, obj, make_index_sequence<N>{}, arg);
        if(!b)
            sfinae(obj, 0, 0, arg);
    }
 
private:
    //  satisfies mpl condition and accepts arguments
    template <typename Up, size_t... Idx, typename... Args>
    auto sfinae(bool& b, Up& obj, index_sequence<Idx...>, Args&&... args)
    {
        TIMEMORY_FOLD_EXPRESSION(
            fold_derive<derived_t<Idx>>(b, obj, std::forward<Args>(args)...));
    }
 
private:
    //  satisfies mpl condition and accepts arguments
    template <typename Up, typename... Args>
    auto sfinae(Up& obj, int, int, Args&&... args)
        -> decltype(obj.derive(std::forward<Args>(args)...), void())
    {
        obj.derive(std::forward<Args>(args)...);
    }
 
    //  satisfies mpl condition but does not accept arguments
    template <typename Up, typename... Args>
    auto sfinae(Up& obj, int, long, Args&&...) -> decltype(obj.derive(), void())
    {
        obj.derive();
    }
 
    //  no member function or does not satisfy mpl condition
    template <typename Up, typename... Args>
    void sfinae(Up&, long, long, Args&&...)
    {
        // SFINAE_WARNING(type);
    }
};
//
//--------------------------------------------------------------------------------------//
//
template <typename Tp>
template <typename... Args>
derive<Tp>::derive(type& obj, Args&&... args)
{
    sfinae(obj, 0, 0, std::forward<Args>(args)...);
}
//
//--------------------------------------------------------------------------------------//
//
}  // namespace operation
}  // namespace tim