Why is Singleton a better choice than Global Objects

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What is so bad about singletons? [closed] 36 answers

C++ singleton vs. global static object 8 answers

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他们是懒惰的构造：

LargeObject   global;                    // Large object is always constructed.

class LargeObject_Singelton
{
    public: static LargeObject& getInstance()
    {
        static LargeObject  instance;     // This object is not created until the first
        return instance;                  // time getInstance() is called.
    }                                     // If you never use it this can be important.
};

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