C++ 如何通过成员函数指针调用？
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How to call through a member function pointer?
提问by Nayana Adassuriya
I'm trying to do some testing with member function pointer. What is wrong with this code? The bigCat.*pcat();statement doesn't compile.
我正在尝试使用成员函数指针进行一些测试。这段代码有什么问题？该bigCat.*pcat();语句无法编译。
class cat {
public:
void walk() {
printf("cat is walking \n");
}
};
int main(){
cat bigCat;
void (cat::*pcat)();
pcat = &cat::walk;
bigCat.*pcat();
}
回答by James McNellis
More parentheses are required:
需要更多括号：
(bigCat.*pcat)();
^ ^
The function call (()) has higher precedence than the pointer-to-member binding operator (.*). The unary operators have higher precedence than the binary operators.
函数调用 ( ()) 的优先级高于成员指针绑定运算符 ( .*)。一元运算符的优先级高于二元运算符。
