2007/5/24, Minmin Gong <gongminmin@yeah.net>:
Hi all. Does Boost.Typeof work with MinGW in a little complex situation? I test it with this:
#include <boost/typeof/typeof.hpp> #include <vector>
using namespace std;
int main() { std::vector<int> v; BOOST_TYPEOF(v)::value_type i; }
It failed. But if the line 9 is changed from BOOST_TYPEOF(v)::value_type i; to typedef BOOST_TYPEOF(v) v_type; v_type::value_type i; It works.
My question is why BOOST_TYPEOF(v)::value_type is not supported? I'm using MinGW with gcc 4.1.2. (3.4.2 fails too. But vc8 is OK.) Thanks.
On GCC we use the native typeof mechanism, so your code is actually translated into this: int main() { std::vector<int> v; typedef typeof(boost::type_of::ensure_obj(v))::type type; } The simpler: typedef typeof(v)::type type; fails to compile as well, so this is a shortcomming in the compiler. Unfortunately there is little we can do to fix this in Boost.Typeof. Regards, Peder
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