Re: [Boost-users] How to use mpl::count and function_types

AMDG On 11/23/2011 09:29 AM, Allan Nielsen wrote:

I'm trying to count the number of parameters in a function-type:

cout << boost::mpl::count< boost::function_types::parameter_types< void() > >::value << endl; cout << boost::mpl::count< boost::function_types::parameter_types< void(int) > >::value << endl; cout << boost::mpl::count< boost::function_types::parameter_types< void(int, int) > >::value << endl;

This prints: 0 0 0

I would have expected: 0 1 2

What have I done wrong?

What you want is mpl::size. mpl::count takes two arguments and return the number of elements equal to the second argument (like std::count). In Christ, Steven Watanabe