294dc29f7f
Redeclaration of forward declares is a GNU extension. This is unnecessary as it has been already forward declarated at the appropriate point. This helps compatibility with clang. Signed-off-by: Saleem Abdulrasool <compnerd@compnerd.org>
83 lines
2.1 KiB
C++
83 lines
2.1 KiB
C++
/* vim: set sw=4 sts=4 et foldmethod=syntax : */
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/*
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* Copyright (c) 2005, 2006, 2007, 2010 Ciaran McCreesh
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*
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* This file is part of the Paludis package manager. Paludis is free software;
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* you can redistribute it and/or modify it under the terms of the GNU General
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* Public License version 2, as published by the Free Software Foundation.
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*
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* Paludis is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef PALUDIS_GUARD_PALUDIS_SINGLETON_HH
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#define PALUDIS_GUARD_PALUDIS_SINGLETON_HH 1
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#include <paludis/util/attributes.hh>
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/** \file
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* Singleton pattern.
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*
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* \ingroup g_oo
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*
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* \section Examples
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*
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* - None at this time.
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*/
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namespace paludis
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{
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/**
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* Singletons have a single instance and are created when first used.
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*
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* \ingroup g_oo
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* \nosubgrouping
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*/
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template <typename OurType_>
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class PALUDIS_VISIBLE Singleton
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{
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private:
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static OurType_ * * _get_instance_ptr();
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class DeleteOnDestruction;
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friend class DeleteOnDestruction;
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static void _delete(OurType_ * const p);
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public:
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///\name Basic operations
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///\{
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Singleton() = default;
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Singleton(const Singleton &) = delete;
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const Singleton & operator= (const Singleton &) = delete;
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///\}
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///\name Singleton operations
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///\{
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/**
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* Fetch our instance.
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*/
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static OurType_ * get_instance()
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PALUDIS_ATTRIBUTE((warn_unused_result));
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/**
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* Destroy our instance.
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*/
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static void destroy_instance();
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///\}
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};
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}
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#endif
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