通过模板判断Value是否为指针

#include <stdio.h>
#include<iostream>
#include<vector>
template<typename T>
struct is_pointer { static const bool value = false; };

template<typename T>
struct is_pointer<T*> { static const bool value = true; };

template<typename T>
void func(T& v) {
std::cout << "is it a pointer? " << is_pointer<T>::value << std::endl;
}
int main(int argc, char *argv[])
{
__uint128_t x = 1111UL;
printf("%llu\n", x);
func(x);
return 0;
}