Web Reference: Apr 30, 2020 · For static member variables, the initialization would be dangerous. Assuming that a class is declared in a header which is included multiple times, this would result in a violation of the One Definition Rule. 错误原因 : 如果你在类的声明中声明了一个静态成员变量但没有在类外部初始化它,编译器将会抛出类似于 non-const static data member must be initialized out of line 的错误。 这是因为编译器需要确保静态成员变量有唯一的定义和初始值。 To initialize a static data member that's defined as volatile, non-const, or not an integral type, use a member-definition statement. They can't be initialized in a declaration.
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