Implementing a type trait

I copied/adapted this code from Polukhin's Boost book:

	#include <vector>
	#include <boost/type_traits/integral_constant.hpp>
	#include <cstdio>
	template <class T>
	struct is_stdvector: boost::false_type {};
	template <class T, class Allocator>
	struct is_stdvector<std::vector<T, Allocator> >: boost::true_type
	{};
	int main()
	{
	printf("int=%s\n", is_stdvector<int>::value ? "true" : "false");
	printf("vector<int>=%s\n", is_stdvector<std::vector<int>>::value ? "true" : "false");
	printf("vector<char*>=%s\n", is_stdvector<std::vector<char*>>::value ? "true" : "false");
	return 0;
	}

view raw polukhin_4p1.cpp hosted with ❤ by GitHub

When run:

kuyu@ub16:~/dkuyu/Dropbox/practice/cpp/polukhin/ch04/implement_type_trait$ g++ -std=c++11 -I/home/kuyu/dkuyu/bin/boost_1_60_0 1.cpp && ./a.out
int=false
vector<int>=true
vector<char*>=true