CA和d0行表示内联的构造函数，该构造函数将值true和5存储到Singleton对象。
Lines CA and D0 represent the inline constructor storing the values true and 5 into the Singleton object.
CA和d0行表示内联的构造函数，该构造函数将值true和5存储到Singleton对象。
Lines CA and D0 represent the inline constructor storing the values true and 5 into the Singleton object.
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