Re: [Boost-users] Fusion: Structs containing an array

Subject: Re: [Boost-users] Fusion: Structs containing an array
From: TONGARI (tongari95_at_[hidden])
Date: 2011-02-02 12:11:20

2011/2/1 Gunther Laure <gunther.laure_at_[hidden]>

> Hi!
>
> I am trying to use boost fusion to build [de]serializer for simple types
> (int ...) and structs.
> I had success until I tried structures holding arrays.
>
> Example:
> struct EntryTable
> {
>     unsigned int count;
>     unsigned int data[4];
> };
>
> BOOST_FUSION_ADAPT_STRUCT(
>   EntryTable,
>   (unsigned int, count)
>   (unsigned int, data[4])
> )

[...]

> fusion::vector<unsigned int, unsigned int[4]> f2 = t;  // doesnt work (not
> even compile)

[...]

> What am I doing wrong? Is there a simple way to simple wrap an array using
> fusion?
>

It's infeasible to use C-array here since there's no assignment for such.
Use Boost.Array instead.

Sample code
---------------------
typedef boost::array<unsigned int, 4> array_t;

struct EntryTable
{
    unsigned int count;
    boost::array<unsigned int, 4> data;
};

BOOST_FUSION_ADAPT_STRUCT(
  EntryTable,
  (unsigned int, count)
  (array_t, data)
)
...

EntryTable t;
fusion::vector<unsigned int, array_t> f2 = t;  // now it should work

HTH