C/C++ struct interfacing

[Oleg B]

Hello.
I want use one struct in two language.
How to declare the same structure in different languages​​?
D code: calling C++ function with my struct
<code>
extern(C++)
{
    struct vec(size_t N, T=float)
    { // << line 6
        alias vec!(N,T) thistype;
        T[N] data;

        auto opBinary(string op)( in thistype rhs ) const
        {
            thistype ret;
            foreach( i; 0 .. N ) ret.data[i] = data[i] + 
rhs.data[i];
            return ret;
        }
    }

    void cppcall( vec!(3,float) d );
}

void main()
{
    vec!3 a, b;
    a.data[0] = 10;
    a.data[1] = 7;
    a.data[2] = 3;

    b.data[0] = 13;
    b.data[1] = 9;
    b.data[2] = 4;

    cppcall( a + b );
}
</code>

C++ code: use struct data
<code>
#include <cstdio>

struct vec
{
    float data[3];
};

void cppcall( vec d )
{
    printf( "%f %f %f\n", d.data[0], d.data[1], d.data[2] );
}
</code>

compilation failed with unclear error

$ g++ -c ctypestest.cpp -o ctypestest.o
$ dmd ctypestest.d ctypestest.o -ofctypestest
ctypestest.d(6): Error: struct ctypestest.vec!(3, float).vec C++ 
static variables not supported