[Boost-users] [mpl] cross product of 2 sequences

21 Nov 2007

      Hello,

I need metafunction cross_product, which should
transform 2 sequences to a sequence of pairs.

Example:

typedef list l1;
typedef list l2;
typedef cross_product::type c;
typedef list<
    pair,
    pair,
    pair,
    pair
...
e;
BOOST_MPL_ASSERT((equal));
The best definition I came up with is the
following:

template 
struct product : transform >
{
};

template 
struct cross_product :
    fold<
        typename transform >::type,
        list<>,
        joint_view<_1, _2>
    >
{
};

Is there a better way to do it? How can I get rid of
'struct product' and implement it as one metafunction?

Regards,
Roman Perepelitsa

Deutsche Bank Moscow
+7 (495) 660-74-08

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