Hi Steve, On Sun, Nov 18, 2012 at 7:27 PM, Steve Lorimer wrote:

What happens if you drop the ::type from is_same?

void read_data_24( typename enable_if< mpl::and_< mpl::true_, mpl::bool_< is_same< T1, T2 >::value > > >::type* /* ptr */ = 0)

(I don't have VS compiler so can't test - but dropping ::type from is_same still compiles fine on gcc 4.7.0 for me)

Yes that worked for me. Thanks a lot! One more thing do I actually need to build a mpl::bool_ out of the is_same function? Christian

#include #include #include

using namespace boost;

struct foo { void bla() { read_data_24(); }

template< typename T1, typename T2> void read_data_24(typename enable_if_c< is_same< T1, T2 >::value>::type* = 0)

{ int i = 9; } };

int main(int argc, char* argv[]) { return 0; }

Thanks for info. It's a good idea to use enable_if_c! Christian

No, in fact you can drop the bool, and and true; and just use enable_if. enable_if will even use the boolean operator to get to the underlying boolean ::value so you drop even more syntax:

template< typename T1 , typename T2 > void read_data_24( typename enable_if< is_same< T1, T2 > > ::type* /* ptr */ = 0) { int i = 9;

}

Thanks, that works, as well! Christian