klips/cpp/patterns/singleton/singleton.hpp

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#ifndef SINGLETON_H
#define SINGLETON_H
#include <iostream>
#include <string>
class Singleton {
public:
static Singleton &getInstance();
~Singleton();
inline void showMessage() const { std::cout << message;}
inline void updateMessage(const std::string &m) { message = m;}
private:
std::string message;
// Don't allow copying of this class
// Ignore -Wreturn-type warnings; It's intentional for this pattern
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wreturn-type"
Singleton() { message = "New singleton\n";}
Singleton(const Singleton &) {}
Singleton &operator=(const Singleton &) {}
// Unmatched pop reverts GCC to commandline options
#pragma GCC diagnostic pop
#pragma GCC diagnostic pop
};
#endif // SINGLETON_H