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1 c++中的静态函数，以前觉得应该可能会先调用一下参数为空的构造函数，后来发现不是这样，代码如下
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class A {
public:
static void staticFunc(){printf("static
func\n");}
A(int a):m_a(a){printf("A(int)\n");}
private:
A(){printf("A()\n");}
int m_a;
};
int main()
{
A::staticFunc();
return 0;
}
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2 bitfield(位域)操作的问题。一定要定义unsigned int，而不是int
代码如下
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struct USER {
//尝试把下面的unsigned去掉，你会得到不同的结果
unsigned int a:1;
unsigned int flag:2;
bool test:1;
};
int main()
{
struct USER myuser;
memset(&myuser, 0, sizeof(myuser));
myuser.a = 1;
myuser.flag = 3;
myuser.test = true;
printf("myuser test is %d\n", myuser.test);
printf("myuser a is %x\n", myuser.a);
printf("myuser flag is %d\n", myuser.flag);
return 0;
}
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