mirror of
https://github.com/Icinga/icinga2.git
synced 2026-04-15 22:00:07 -04:00
91c7e60df8
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{/\*[^*]*\(\s*c\s*\)\s*(\d{4})\s*Icinga\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{#.*\(\s*c\s*\)\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' {} +
```
73 lines
1.4 KiB
C++
73 lines
1.4 KiB
C++
// SPDX-FileCopyrightText: 2012 Icinga GmbH <https://icinga.com>
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// SPDX-License-Identifier: GPL-2.0-or-later
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#ifndef LAZY_INIT
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#define LAZY_INIT
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#include <atomic>
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#include <functional>
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#include <mutex>
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#include <utility>
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namespace icinga
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{
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/**
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* Lazy object initialization abstraction inspired from
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* <https://docs.microsoft.com/en-us/dotnet/api/system.lazy-1?view=netframework-4.7.2>.
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*
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* @ingroup base
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*/
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template<class T>
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class LazyInit
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{
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public:
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inline
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LazyInit(std::function<T()> initializer = []() { return T(); }) : m_Initializer(std::move(initializer))
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{
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m_Underlying.store(nullptr, std::memory_order_release);
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}
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LazyInit(const LazyInit&) = delete;
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LazyInit(LazyInit&&) = delete;
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LazyInit& operator=(const LazyInit&) = delete;
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LazyInit& operator=(LazyInit&&) = delete;
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inline
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~LazyInit()
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{
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auto ptr (m_Underlying.load(std::memory_order_acquire));
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if (ptr != nullptr) {
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delete ptr;
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}
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}
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inline
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T& Get()
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{
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auto ptr (m_Underlying.load(std::memory_order_acquire));
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if (ptr == nullptr) {
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std::unique_lock<std::mutex> lock (m_Mutex);
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ptr = m_Underlying.load(std::memory_order_acquire);
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if (ptr == nullptr) {
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ptr = new T(m_Initializer());
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m_Underlying.store(ptr, std::memory_order_release);
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}
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}
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return *ptr;
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}
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private:
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std::function<T()> m_Initializer;
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std::mutex m_Mutex;
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std::atomic<T*> m_Underlying;
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};
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}
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#endif /* LAZY_INIT */
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