On Sunday, 20 October 2013 at 22:04:49 UTC, Agustin wrote:
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;
}
And the final template is
template Hash(string text, hash_t hash = 0, size_t index = 0) {
static if (index < text.length)
enum Hash = Hash!(text, (hash ^ text[index]) * 1099511628211UL,
index + 1);
else
enum Hash = hash;
}
:D
