mirror of https://github.com/PentHertz/srsLTE.git
47 lines
1.0 KiB
C++
47 lines
1.0 KiB
C++
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2021 Software Radio Systems Limited
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*
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* By using this file, you agree to the terms and conditions set
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* forth in the LICENSE file which can be found at the top level of
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* the distribution.
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*
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*/
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#ifndef SRSRAN_SINGLETON_H
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#define SRSRAN_SINGLETON_H
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#include <memory>
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// CRTP pattern to create class singletons
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template <typename T>
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class singleton_t
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{
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public:
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singleton_t(const singleton_t<T>&) = delete;
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singleton_t(singleton_t<T>&&) = delete;
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singleton_t& operator=(const singleton_t<T>&) = delete;
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singleton_t& operator=(singleton_t<T>&&) = delete;
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static T* get_instance()
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{
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// this variable initialization is thread-safe since C++11
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// instance dtor is called on program exit
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static std::unique_ptr<T> instance{new T_instance{}};
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return instance.get();
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}
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protected:
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singleton_t() = default;
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private:
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// this class makes the protected T::T() accessible to the singleton
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struct T_instance : public T {
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T_instance() : T() {}
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};
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};
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#endif // SRSRAN_SINGLETON_H
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