template instantiation

[dshawul]

Hi, The simplified code compiles correctly under GCC but not MSVC. why ? If I put Option struct in its own named namespace or remove the namespace Util, it compiles correclty. How can I make it work for both compilers ?

#include <vector>
#include <iostream>

/*default vector IO*/
template <class T>
std::ostream& operator << (std::ostream& os, const std::vector<T>& p) {
	return os;
}
template <class T>
std::istream& operator >> (std::istream& is, std::vector<T>& p) {
	return is;
}

/*Utililty functions*/
namespace Util {

	/*options*/
	struct Option {
		friend std::istream& operator >> (std::istream& is, Option& p) {
			return is;
		}
		friend std::ostream& operator << (std::ostream& os, const Option& p) {
			return os;
		}
	};

	/*parameters*/
	struct Parameters{
		std::vector<int>* test;
		bool read(std::string str,std::istream& is) {
			is >> *test;
			return false;
		}
	};
	/*end*/
}

void main() {
	Util::Parameters params_vec_int;
	params_vec_int.read("test",std::cin);
}