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Subject: [Boost-users] mpl::set and mpl::fold
From: Paul Graphov (graphov_at_[hidden])
Date: 2010-09-01 02:04:01
Hello Boost Users,
I've encountered a problem while using mpl::fold with mpl::set
I've defined a template to check if one sequence contains all elements of
the other:
namespace mpl = boost::mpl;
template<class A, class B>
struct subset
: mpl::fold<
A,
mpl::true_,
mpl::and_<mpl::_1, mpl::contains<B, mpl::_2> >
>
{};
It works fine with lists and vectors but when first template parameter (A)
is set or set_c
it fails to compile. Did I miss something? Why is it impossible to iterate
through a set via fold?
p.s. tested on gcc and clang under linux.
p.p.s. compilation error is quite huge, the main message is
/usr/local/include/boost/mpl/eval_if.hpp:38: error: no type named âtypeâ in
âstruct boost::mpl::next<boost::mpl::s_iter<boost::mpl::set_c<int, 1l,
9223372036854775807l, 9223372036854775807l, 9223372036854775807l,
9223372036854775807l, 9223372036854775807l, 9223372036854775807l,
9223372036854775807l, 9223372036854775807l, 9223372036854775807l,
9223372036854775807l, 9223372036854775807l, 9223372036854775807l,
9223372036854775807l, 9223372036854775807l, 9223372036854775807l,
9223372036854775807l, 9223372036854775807l, 9223372036854775807l,
9223372036854775807l>, boost::mpl::set0_c<int> > >â
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