pack_algorithm.hpp

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// -----------------------------------------------------------------------------------------------------
// Copyright (c) 2006-2020, Knut Reinert & Freie Universität Berlin
// Copyright (c) 2016-2020, Knut Reinert & MPI für molekulare Genetik
// This file may be used, modified and/or redistributed under the terms of the 3-clause BSD-License
// shipped with this file and also available at: https://github.com/seqan/seqan3/blob/master/LICENSE.md
// -----------------------------------------------------------------------------------------------------
 
#pragma once
 
#include <utility>
 
#include <seqan3/core/type_list/type_list.hpp>
#include <seqan3/std/concepts>
#include <seqan3/std/type_traits>
 
namespace seqan3::detail
{
 
template <typename type_list_t>
struct type_list_expander;
 
template <template <typename ...> typename type_list_t, typename ...args_t>
struct type_list_expander<type_list_t<args_t...>>
{
    template <typename fn_t>
        requires std::invocable<fn_t, std::type_identity<args_t>...>
    static constexpr std::invoke_result_t<fn_t, std::type_identity<args_t>...> invoke_on_type_identities(fn_t && fn)
    {
        return fn(std::type_identity<args_t>{}...);
    }
};
 
//-----------------------------------------------------------------------------
// all_of
//-----------------------------------------------------------------------------
 
template <typename unary_predicate_t, typename ...pack_t>
    requires (std::predicate<unary_predicate_t, pack_t> && ...)
constexpr bool all_of(unary_predicate_t && fn, pack_t && ...args)
{
    return (fn(std::forward<pack_t>(args)) && ...);
}
 
template <typename type_list_t, typename unary_predicate_t>
[[nodiscard]] constexpr bool all_of(unary_predicate_t && fn)
    requires type_list_specialisation<type_list_t>
{
    return type_list_expander<type_list_t>::invoke_on_type_identities([&] (auto && ...type_identities)
    {
        return all_of(fn, std::forward<decltype(type_identities)>(type_identities)...);
    });
}
 
//-----------------------------------------------------------------------------
// for_each
//-----------------------------------------------------------------------------
 
template <typename unary_function_t, typename ...pack_t>
    requires (std::invocable<unary_function_t, pack_t> && ...)
constexpr void for_each(unary_function_t && fn, pack_t && ...args)
{
    (fn(std::forward<pack_t>(args)), ...);
}
 
template <typename type_list_t, typename unary_function_t>
    requires type_list_specialisation<type_list_t>
constexpr void for_each(unary_function_t && fn)
{
    type_list_expander<type_list_t>::invoke_on_type_identities([&] (auto && ...type_identities)
    {
        for_each(fn, std::forward<decltype(type_identities)>(type_identities)...);
    });
}
 
}  // namespace seqan3::detail