87 lines
1.7 KiB
C++
87 lines
1.7 KiB
C++
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// 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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#include <variant>
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#include "libtransmission/settings.h"
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#include "libtransmission/variant.h"
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namespace libtransmission
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{
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namespace
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{
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struct LoadVisitor
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{
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explicit constexpr LoadVisitor(tr_variant const& src)
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: src_{ src }
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{
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}
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template<typename T>
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void operator()(T* const tgt)
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{
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if (auto val = VariantConverter::load<T>(src_))
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{
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*tgt = *val;
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}
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}
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private:
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tr_variant const& src_;
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};
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struct SaveVisitor
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{
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constexpr SaveVisitor(tr_variant::Map& tgt, tr_quark key)
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: tgt_{ tgt }
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, key_{ key }
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{
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}
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template<typename T>
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void operator()(T const* const src)
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{
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tgt_.try_emplace(key_, VariantConverter::save<T>(*src));
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}
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private:
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tr_variant::Map& tgt_;
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tr_quark key_;
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};
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} // unnamed namespace
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void Settings::load(tr_variant const& src)
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{
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auto const* map = src.get_if<tr_variant::Map>();
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if (map == nullptr)
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{
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return;
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}
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for (auto& [key, prop_vptr] : fields())
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{
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if (auto const iter = map->find(key); iter != std::end(*map))
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{
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std::visit(LoadVisitor{ iter->second }, prop_vptr);
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}
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}
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}
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tr_variant Settings::save() const
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{
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auto const fields = const_cast<Settings*>(this)->fields();
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auto map = tr_variant::Map{};
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map.reserve(std::size(fields));
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for (auto const& [key, prop_vptr] : fields)
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{
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std::visit(SaveVisitor{ map, key }, prop_vptr);
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}
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return map;
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}
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} // namespace libtransmission
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