helpers.hpp

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// Copyright (c) 2023-2026 Jakub Musiał
// This file is part of the CPP-ARGON project (https://github.com/SpectraL519/cpp-argon).
// Licensed under the MIT License. See the LICENSE file in the project root for full license information.
 
#pragma once
 
#include "argon/action/util/concepts.hpp"
 
#include <utility>
#include <variant>
 
namespace argon::action::util {
 
template <c_value_action_specifier AS, argon::util::c_argument_value_type T>
using callable_type = typename AS::template type<T>;
 
template <argon::util::c_argument_value_type T>
using value_action_variant_type = std::variant<
 callable_type<action_type::observe, T>,
 callable_type<action_type::transform, T>,
 callable_type<action_type::modify, T>>;
 
template <argon::util::c_argument_value_type T>
struct apply_visitor {
 using value_type = T;
 
 void operator()(const callable_type<action_type::observe, value_type>& action) const {
        action(std::as_const(value));
    }
 
 void operator()(const callable_type<action_type::transform, value_type>& action) const {
 value = action(std::as_const(value));
    }
 
 void operator()(const callable_type<action_type::modify, value_type>& action) const {
        action(value);
    }
 
 value_type& value; 
};
 
} // namespace argon::action::util