icinga2/lib/base/singleton.hpp

// SPDX-FileCopyrightText: 2012 Icinga GmbH <https://icinga.com>
// SPDX-License-Identifier: GPL-2.0-or-later

#ifndef SINGLETON_H
#define SINGLETON_H

#include "base/i2-base.hpp"

namespace icinga
{

/**
 * A singleton.
 *
 * @ingroup base
 */
template<typename T>
class Singleton
{
public:
	static T *GetInstance()
	{
		static T instance;
		return &instance;
	}
};

}

#endif /* SINGLETON_H */
Replace all existing copyright headers with `SPDX` headers I've used the following command to replace the original copyright header lines in a C-style comment block: ``` $ find . \( -type d \( -name '\..' -o -name third-party -o -name scripts -o -name prefix -o -name malloc -o -name server -o -name docker -o -name build -o -name doc \) -prune \) -o -type f -exec perl -pi -e 's{/\[^]\(\sc\s\)\s(\d{4})\sIcinga\s+GmbH[^]\/}{// SPDX-FileCopyrightText: \1 Icinga GmbH <https://icinga.com>\n// SPDX-License-Identifier: GPL-2.0-or-later}gi' {} + ``` For files that use shell-style comments (#) like CMakeLists.txt, I've used this command: ``` $ find . \( -type d \( -name '\..' -o -name third-party -o -name scripts -o -name prefix -o -name malloc -o -name server -o -name docker -o -name build -o -name doc \) -prune \) -o -type f -exec perl -pi -e 's{#.\(\sc\s\)\s(\d{4})\sIcinga\s+GmbH.}{# SPDX-FileCopyrightText: \1 Icinga GmbH <https://icinga.com>\n# SPDX-License-Identifier: GPL-2.0-or-later}gi' {} + ``` And for SQL files: ``` $ find . \( -type d \( -name '\..' -o -name third-party -o -name scripts -o -name prefix -o -name malloc -o -name server -o -name docker -o -name build -o -name doc \) -prune \) -o -type f \( -name '.sql' \) -exec perl -pi -e 's{--.\(c\)\s(\d{4})\sIcinga\sGmbH.}{-- SPDX-FileCopyrightText: \1 Icinga GmbH <https://icinga.com>\n-- SPDX-License-Identifier: GPL-2.0-or-later}gi' {} + $ find . \( -type d \( -name '\..' -o -name third-party -o -name scripts -o -name prefix -o -name malloc -o -name server -o -name docker -o -name build -o -name doc \) -prune \) -o -type f \( -name '.sql' \) -exec perl -pi -e 's{-- Copyright \(c\)\s(\d{4})\sIcinga\s+Development\sTeam.*}{-- SPDX-FileCopyrightText: \1 Icinga GmbH <https://icinga.com>\n-- SPDX-License-Identifier: GPL-2.0-or-later}gi' {} + ``` 2026-01-27 09:06:40 -05:00			`// SPDX-FileCopyrightText: 2012 Icinga GmbH <https://icinga.com>`
			`// SPDX-License-Identifier: GPL-2.0-or-later`
Fix --disable-shared Fixes #3852 2013-03-15 06:19:52 -04:00
			`#ifndef SINGLETON_H`
			`#define SINGLETON_H`

Rename C++ header files. Fixes #6291 2014-05-25 10:23:35 -04:00			`#include "base/i2-base.hpp"`
Refactor #includes (Part 2). 2013-03-16 16:18:53 -04:00
Fix --disable-shared Fixes #3852 2013-03-15 06:19:52 -04:00			`namespace icinga`
			`{`

			`/**`
			`* A singleton.`
			`*`
			`* @ingroup base`
			`*/`
			`template<typename T>`
Windows build fix. 2013-03-18 17:40:40 -04:00			`class Singleton`
Fix --disable-shared Fixes #3852 2013-03-15 06:19:52 -04:00			`{`
			`public:`
Apply clang-tidy fix 'modernize-redundant-void-arg' 2018-01-03 22:25:35 -05:00			`static T *GetInstance()`
Fix --disable-shared Fixes #3852 2013-03-15 06:19:52 -04:00			`{`
Remove unused includes 2018-01-04 12:24:45 -05:00			`static T instance;`
			`return &instance;`
Fix --disable-shared Fixes #3852 2013-03-15 06:19:52 -04:00			`}`
			`};`

			`}`

			`#endif /* SINGLETON_H */`