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struct Foo;// 结构体的前置声明 struct Bar // 结构体的定义{ Bar(int i): i(i + i){} int i;}; enumstruct Pub // 有作用域枚举,C++11 起{ b, d, p, q, }; int main(){ Bar Bar(1);struct Bar Bar2(2);// 详述类型}
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