On Tue, 06 Aug 2013 14:12:09 -0700, Steven Watanabe <watanabesj@gmail.com> wrote:

AMDG

On 08/06/2013 12:47 PM, Mathias Gaunard wrote:

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On 06/08/13 01:52, Mostafa wrote:

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Looks like the example found here: http://www.boost.org/doc/libs/1_54_0/libs/mpl/doc/refmanual/at.html is buggy:

BOOST_MPL_ASSERT_RELATION( (at< range, int_<0> >::value), ==, 10 );

It should be:

BOOST_MPL_ASSERT_RELATION( (at< range, int_<0> >::type::value), ==, 10 );

Both should work.

That's only for arithmetic functions.

Steven, sorry I don't understand what you're trying to say. Mathias, on Win7/Cygwin g++ 4.7.3 I get the following results, which contradict the example on the boost web page: #include <boost/mpl/range_c.hpp> #include <boost/mpl/at.hpp> #include <boost/mpl/int.hpp> #include <boost/mpl/assert.hpp> int main() { namespace bm = boost::mpl; typedef bm::range_c<long,10,50> range; //Does not compile. //bm::at<range, bm::int_<0> >::value == 10; //Compiles. //bm::at<range, bm::int_<0> >::type::value == 10; using namespace boost::mpl; //Does not compile. //BOOST_MPL_ASSERT_RELATION( (at< range, int_<0> >::value), ==, 10 ); //Compiles. BOOST_MPL_ASSERT_RELATION( (at< range, int_<0> >::type::value), ==, 10 ); return 0; }