简单示例
#include <unordered_map>
class A {
public:
std::string s;
static size_t hashFun(const A & a) {
return std::hash<std::string>()(a.s);
}
bool operator==(const A & a) const {
// do something
return true;
}
};
int main() {
std::unordered_map<A, std::string, decltype(&A::hashFun)> a(10, A::hashFun);
return system("pause");
}
