operator overloading compilation error

[Diego Canuhé]

Hi
I'm trying to overload the "+" and "-" operators for a struct  but I get
this error

test.d(47): Error: incompatible types for ((v1) - (v2)): 'Vecf!(1u)' and
'Vecf!(1u)'
(the line corresponds to the last assert)

doing something like this

struct Vecf(uint n)
{
    ...
    Vecf!n opBinary(string op)(Vecf!n other) if (op == "+" || op == "-")
{...}
}

void main()
{
    Vecf!1u v1 = Vecf!1u(3f);
    Vecf!1u v2 = Vecf!1u(5f);
    Vecf!1u r = Vecf!1u(-2f);
    assert ((v1.opBinary!"-"(v2)) == r);
    assert ((v1 - v2) == r);
}

removing the last assert or replacing (Vecf!n other) by (Vecf!1u other) in
the function declaration works fine, but it's not what I want

Any ideas? maybe I'm overloading the operators in the wrong way (it worked
in a very similar test though)?

Thanks!!

Here's the full code:

-------------------------------------------------------------------
module test;

import std.stdio;

struct Vecf(uint n)
{
    float[n] data;


    this(float[n] args ...)
    {
        foreach (i, a; args)
        {
            data[i] = a;
        }
    }

    float opIndex(uint i)
    {
        return data[i];
    }

    float opIndexAssign(float value, uint i)
    {
        data[i] = value;
        return value;
    }

    Vecf!n opBinary(string op)(Vecf!n other) if (op == "+" || op == "-")
    {
        Vecf!n ret;

        for (size_t i = 0; i < n; i++)
        {
            mixin("ret[i] = this[i] " ~ op ~ " other[i];");
        }
        return ret;
    }
}

void main()
{
    Vecf!1u v1 = Vecf!1u(3f);
    Vecf!1u v2 = Vecf!1u(5f);
    Vecf!1u r = Vecf!1u(-2f);
    assert ((v1.opBinary!"-"(v2)) == r);
    assert ((v1 - v2) == r);
}
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