97 lines
2.4 KiB
C++
97 lines
2.4 KiB
C++
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/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright 2019 Danny Robson <danny@nerdcruft.net>
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*/
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#pragma once
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#include "log.hpp"
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#include "introspection.hpp"
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#include <map>
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#include <stdexcept>
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namespace cruft {
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template <typename KeyT, typename FactoryT>
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class registry {
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public:
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struct cookie {
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explicit cookie (KeyT const &_key)
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: m_key (_key)
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{ ; }
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explicit cookie (KeyT &&_key)
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: m_key (std::move (_key))
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{ ; }
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cookie (cookie &&rhs) noexcept
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: m_key (std::move (rhs.key))
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{ ; }
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cookie& operator= (cookie &&rhs) noexcept
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{
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std::swap (rhs.m_key, m_key);
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return *this;
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}
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cookie (cookie const&) = delete;
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cookie& operator= (cookie const&) = delete;
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~cookie ()
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{
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registry::remove (m_key);
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}
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private:
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KeyT m_key;
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};
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static cookie
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add [[nodiscard]] (KeyT key, FactoryT &&factory)
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{
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auto const &[pos, success] = store ().insert (
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{ key, std::move (factory) }
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);
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if (success) {
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LOG_INFO ("Registered %! for %!", key, cruft::type_name<FactoryT> ());
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return cookie { key };
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} {
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LOG_ERROR ("Unable to register %! for %!", key, cruft::type_name<FactoryT> ());
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throw std::runtime_error ("Unable to register type");
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}
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}
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static FactoryT remove (KeyT const &key)
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{
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auto &s_factory = store ();
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auto pos = s_factory.find (key);
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if (pos == s_factory.cend ())
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throw std::invalid_argument ("Key not found");
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auto val = s_factory.extract (pos);
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return std::move (val.mapped ());
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}
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static FactoryT& at (KeyT const &key)
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{
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return store ().at (key);
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}
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private:
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static auto&
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store (void)
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{
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static std::map<KeyT,FactoryT> s_factory;
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return s_factory;
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}
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};
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}
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