75 lines
2.0 KiB
C++
75 lines
2.0 KiB
C++
// This file Copyright © Mnemosyne LLC.
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// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
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// or any future license endorsed by Mnemosyne LLC.
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// License text can be found in the licenses/ folder.
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#pragma once
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#include <functional>
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#include <typeindex>
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#include <typeinfo>
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#include <unordered_map>
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#include <vector>
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#include "libtransmission/quark.h"
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#include "libtransmission/variant.h"
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namespace libtransmission
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{
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class Settings
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{
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public:
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void load(tr_variant const& src);
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[[nodiscard]] tr_variant save() const;
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protected:
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Settings();
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// convert from tr_variant to T
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template<typename T>
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using Load = bool (*)(tr_variant const& src, T* tgt);
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// convert from T to tr_variant
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template<typename T>
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using Save = tr_variant (*)(T const& src);
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template<typename T>
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void add_type_handler(Load<T> load_handler, Save<T> save_handler)
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{
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auto const key = std::type_index(typeid(T*));
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// wrap load_handler + save_handler with void* wrappers so that
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// they can be stored in the save_ and load_ maps
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load_.insert_or_assign(
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key,
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[load_handler](tr_variant const& src, void* tgt) { return load_handler(src, static_cast<T*>(tgt)); });
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save_.insert_or_assign(key, [save_handler](void const* src) { return save_handler(*static_cast<T const*>(src)); });
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}
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struct Field
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{
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template<typename T>
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Field(tr_quark key_in, T* ptr_in)
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: key{ key_in }
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, type{ typeid(T*) }
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, ptr{ ptr_in }
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{
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}
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tr_quark key;
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std::type_info const& type;
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void* ptr;
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};
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using Fields = std::vector<Field>;
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[[nodiscard]] virtual Fields fields() = 0;
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private:
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std::unordered_map<std::type_index, std::function<tr_variant(void const* src)>> save_;
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std::unordered_map<std::type_index, std::function<bool(tr_variant const& src, void* tgt)>> load_;
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};
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} // namespace libtransmission
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