25 lines
415 B
C++
25 lines
415 B
C++
#ifndef __OPENGLPLAYGROUND_SINGLETON_HH__
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#define __OPENGLPLAYGROUND_SINGLETON_HH__
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#include <memory>
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#include <mutex>
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template<typename T>
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class Singleton {
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public:
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static T& getInstance() {
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call_once(instance_flag, init);
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return *instance;
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}
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private:
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static std::unique_ptr<T> instance;
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static std::once_flag instance_flag;
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static void init() {
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instance.reset(new T{});
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}
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};
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#endif
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