788e3b31e1
The "pure" and "const" attributes are not so well-defined, and a recent clang version implements an optimization which pushes the definition's boundary beyond what I believed it was. clang now assumes that functions declared "pure" cannot throw exceptions, even if they lack the "noexcept" specification. When compiled with this new clang version, MPD will crash randomly if an exception happens to get thrown by such as "pure" function (https://github.com/MusicPlayerDaemon/MPD/issues/41). This commit removes all such misplaced "pure" and "const" attributes, closing #41.
140 lines
3.2 KiB
C++
140 lines
3.2 KiB
C++
/*
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* Copyright 2003-2017 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef MPD_INSTANCE_HXX
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#define MPD_INSTANCE_HXX
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#include "check.h"
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#include "event/Loop.hxx"
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#include "event/MaskMonitor.hxx"
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#include "Compiler.h"
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#ifdef ENABLE_NEIGHBOR_PLUGINS
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#include "neighbor/Listener.hxx"
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class NeighborGlue;
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#endif
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#ifdef ENABLE_DATABASE
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#include "db/DatabaseListener.hxx"
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class Database;
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class Storage;
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class UpdateService;
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#endif
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class ClientList;
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struct Partition;
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class StateFile;
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/**
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* A utility class which, when used as the first base class, ensures
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* that the #EventLoop gets initialized before the other base classes.
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*/
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struct EventLoopHolder {
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EventLoop event_loop;
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};
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struct Instance final
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: EventLoopHolder
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#if defined(ENABLE_DATABASE) || defined(ENABLE_NEIGHBOR_PLUGINS)
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,
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#endif
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#ifdef ENABLE_DATABASE
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public DatabaseListener
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#ifdef ENABLE_NEIGHBOR_PLUGINS
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,
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#endif
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#endif
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#ifdef ENABLE_NEIGHBOR_PLUGINS
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public NeighborListener
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#endif
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{
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MaskMonitor idle_monitor;
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#ifdef ENABLE_NEIGHBOR_PLUGINS
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NeighborGlue *neighbors;
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#endif
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#ifdef ENABLE_DATABASE
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Database *database;
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/**
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* This is really a #CompositeStorage. To avoid heavy include
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* dependencies, we declare it as just #Storage.
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*/
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Storage *storage = nullptr;
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UpdateService *update = nullptr;
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#endif
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ClientList *client_list;
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Partition *partition;
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StateFile *state_file;
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Instance()
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:idle_monitor(event_loop, BIND_THIS_METHOD(OnIdle)), state_file(nullptr) {}
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/**
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* Initiate shutdown. Wrapper for EventLoop::Break().
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*/
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void Shutdown() {
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event_loop.Break();
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}
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void EmitIdle(unsigned mask) {
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idle_monitor.OrMask(mask);
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}
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#ifdef ENABLE_DATABASE
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/**
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* Returns the global #Database instance. May return nullptr
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* if this MPD configuration has no database (no
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* music_directory was configured).
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*/
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Database *GetDatabase() {
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return database;
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}
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/**
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* Returns the global #Database instance. Throws
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* DatabaseError if this MPD configuration has no database (no
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* music_directory was configured).
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*/
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const Database &GetDatabaseOrThrow() const;
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#endif
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private:
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#ifdef ENABLE_DATABASE
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void OnDatabaseModified() override;
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void OnDatabaseSongRemoved(const char *uri) override;
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#endif
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#ifdef ENABLE_NEIGHBOR_PLUGINS
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/* virtual methods from class NeighborListener */
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void FoundNeighbor(const NeighborInfo &info) override;
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void LostNeighbor(const NeighborInfo &info) override;
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#endif
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/* callback for #idle_monitor */
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void OnIdle(unsigned mask);
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};
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#endif
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