[mlpack-git] [mlpack] Compile Error in Neighbour Search (#476)

[Ryan Curtin]

As far as I can tell perusing the standard, MSVC is in the wrong here.  Here is a more minimal example that should produce the problem:

```
template<typename A, typename B = double>
class C
{

};

template<typename A>
using D = C<A>;

int main()
{
  D<float> d;
}
```

That compiles fine with gcc 4.9.2 and clang 3.5.0.  Does that compile with MSVC?

If not, I would suggest that maybe a bug should be filed with the Microsoft compiler team.

In the mean time, the workaround you suggest here is a bit ugly, unfortunately, but should still work with gcc and clang, so if stereomatchingkiss can also reproduce the error (maybe with the snippet I posted too), we can incorporate your fix.

---
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https://github.com/mlpack/mlpack/issues/476#issuecomment-158937726
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