Re: "else if" for template constraints

[Idan Arye via Digitalmars-d]

On Monday, 17 August 2015 at 13:18:43 UTC, Steven Schveighoffer 
wrote:
void replaceInPlace(T, Range)(ref T[] array, size_t from, 
size_t to, Range stuff)
if(isDynamicArray!Range &&
    is(Unqual!(ElementEncodingType!Range) == T) &&
    !is(T == const T) &&
    !is(T == immutable T))
{ /* version 1 that tries to write into the array directly */ }
void replaceInPlace(T, Range)(ref T[] array, size_t from, 
size_t to,
Range stuff)
else if(is(typeof(replace(array, from, to, stuff))))
{ /* version 2, which simply forwards to replace */ }

It looks a bit ugly, that the `else` is after a function 
declaration instead of directly after the if's "then" clause. How 
about doing it with the full template style?

    template replaceInPlace(T, Range)
    if(isDynamicArray!Range &&
        is(Unqual!(ElementEncodingType!Range) == T) &&
        !is(T == const T) &&
        !is(T == immutable T))
    {
        void replaceInPlace(ref T[] array, size_t from, size_t 
to, Range stuff)
        { /* version 1 that tries to write into the array 
directly */ }
    }
    else if(is(typeof(replace(array, from, to, stuff))))
    {
        void replaceInPlace(ref T[] array, size_t from, size_t 
to, Range stuff)
        { /* version 2, which simply forwards to replace */ }
    }