为什么Singleton是比全局对象更好的选择

这个问题在这里已经有了答案：

单身人士有什么不好？ [已关闭] 36个回答

C ++单例与全局静态对象8个答案

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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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