tree_node_fwd.hpp

// Copyright (C) 2022-2023 by Camden Mannett.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE or copy at https://www.boost.org/LICENSE_1_0.txt)
 
#pragma once
 
#include "arg_router/utility/dynamic_string_view.hpp"
 
#include <utility>
 
namespace arg_router
{
struct runtime_help_data {
    utility::dynamic_string_view label;        
    utility::dynamic_string_view description;  
    vector<runtime_help_data> children;        
};
 
template <typename... Params>
class tree_node;
 
template <typename T>
struct is_tree_node {
private:
    template <typename... Ts>
    constexpr static std::true_type test(const tree_node<Ts...>*);
 
    constexpr static std::false_type test(...);
 
public:
    // NOLINTNEXTLINE(hicpp-vararg)
    constexpr static bool value = decltype(test(std::declval<T*>()))::value;
};
 
template <typename T>
constexpr bool is_tree_node_v = is_tree_node<T>::value;
}  // namespace arg_router