Implementing a type trait

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

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