You can get the code to compile with two changes:

bool function(T)(T val1,T val2) ptr=∁

should be:

bool function(T val1,T val2) ptr=&comp!T;



The function pointer itself isn't a template, so it doesn't need the (T) parameter. Instead, since it is inside a template, you can just use the T from the outside directly.

Moreover, comp has compile time arguments, so you can't take the address of it without forwarding the arguments. So instead of &comp, you use &comp!T - passing the T from the outside to the comparison function too.

and also

int partition(T)(T[]list,bool function(T)(T val1,T val2)ptr,int

should be:

int partition(T)(T[]list,bool function(T val1,T val2)ptr,int


Again because the pointer isn't a new template, it should just use the type T from the outer argument list.

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