Hello,
In my typed data frames I've this type of code. It works for
default value (float) but I can't call `opIndex!double[i, j]` or
`opIndex!string[i,j]`. It just doesn't work and I get the error
`is not a template declaration, it is a variable`.
```d
// Overload [i, j]
ref T opIndex(T = float)(size_t i, size_t j) const {
alias SliceType = Slice!(T*);
// colValues is of type void*[], i cast it to a slice type and
get
// the value at index i (row index)
auto values = cast(SliceType*) colValues[j];
return (*values)[i];
}
```
Any help would be really appreciated.
