[英]c++ factory pattern syntax
In this question , the accepted answer uses the following syntax: 在这个问题中 ,接受的答案使用以下语法:
typedef std::map<std::string, Base*(*)()> map_type;
Can someone explain what the (*) means, I've never seen it before? 有人可以解释(*)的意思,我以前从未见过它吗?
It is a function pointer that returns a Base
pointer and takes no arguments, eg 它是一个返回Base
指针并且不带参数的函数指针 ,例如
struct Base {};
Base* myfun() {
return 0;
}
int main() {
std::map<std::string, Base*(*)()> mymap;
mymap.insert(std::make_pair("hello", myfun));
}
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