36 lines
1.0 KiB
C++
36 lines
1.0 KiB
C++
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#ifndef SINGLETON_POINTER_HPP
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#define SINGLETON_POINTER_HPP
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#include <iostream>
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#include <string>
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class ClassicSingleton{
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public:
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// returns pointer to single getInstance
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static ClassicSingleton* getInstance();
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// example functions manipulating singleton object
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inline void showMessage() const { std::cout << message;}
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void updateMessage(const std::string &m) { message=m;}
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private:
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// Do not allow construction of this object; Use getInstance() instead
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ClassicSingleton(){ message = "New ClassicSingleton\n";}
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// Do not allow copying of this object
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ClassicSingleton(const ClassicSingleton&){}
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// Ignore -Wreturn-type warnings; It's intentional for this pattern
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wreturn-type"
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ClassicSingleton& operator=(const ClassicSingleton&){}
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// Unmatched pop reverts GCC to commandline options
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#pragma GCC diagnostic pop
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#pragma GCC diagnostic pop
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// Static pointer to instance of this singleton
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static ClassicSingleton* instance;
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std::string message;
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};
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#endif // SINGLETON_POINTER_HPP
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