Weird error when compiling.

[Agustin]

On Sunday, 20 October 2013 at 21:54:37 UTC, Agustin wrote:
> On Sunday, 20 October 2013 at 02:14:55 UTC, TheFlyingFiddle 
> wrote:
>>> Anyway to evaluate the name of the class and return its hash 
>>> at compile time?
>>
>> I couldn't find the built in hash unction for strings so i 
>> used the one from http://dlang.org/hash-map.html as an 
>> example. More advanced and better hash functions can be found 
>> online.
>>
>> public class ComponentDetail(T) : Component {
>> 	////////////////////////////////////////////////////////////
>> 	/// Component's ID as static member.
>> 	public static hash_t ID = hash!(T);
>> }
>>
>> hash_t hash(T)()
>> {
>>    hash_t hash;
>>    foreach (char c; T.stringof)
>>        hash = (hash * 9) + c;
>>    return hash;
>> }
>
> Works perfectly :), now if i want to implement the same but
> rather do something like
>
> template GetHash(string character, hash_t hash = 0, size_t index
> = 0) {
> 	static if (character[index])
> 		enum GetHash = GetHash(character, hash = (hash * 9) +
> character[index], ++index);
> 	else
> 		enum GetHash = hash;
> }
>
> How should i implement it?

I came up with something like


template GetHash(string character, hash_t hash = 0, size_t index 
= 0) {
	static if (index < character.length)
		enum GetHash = GetHash!(character, (hash * 9) + 
character[index], index + 1);
	else
		enum GetHash = hash;
}