From 2fc49125e73554d68b4ee8874b9f84725b6f2157 Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Fri, 9 Jul 2010 14:02:35 +0200
Subject: Immutable tuples

---
 src/Term.vala | 37 ++++++++++++++++++++++++-------------
 1 file changed, 24 insertions(+), 13 deletions(-)

diff --git a/src/Term.vala b/src/Term.vala
index e0033d6..f2799e9 100644
--- a/src/Term.vala
+++ b/src/Term.vala
@@ -65,13 +65,13 @@ namespace Eva {
       case Erl.TermType.SMALL_TUPLE:
       case Erl.TermType.LARGE_TUPLE:
         assert(Erl.decode_tuple_header(buffer, ref index, out size) == 0);
-        Tuple term = new Tuple();
+        Term[] terms = new Term[size];
         
         for(int i = 0; i < size; ++i) {
-          term.value.add(do_decode(buffer, ref index));
+          terms[i] = do_decode(buffer, ref index);
         }
         
-        return term;
+        return new Tuple(terms);
         
       case Erl.TermType.NIL:
       case Erl.TermType.LIST:
@@ -269,18 +269,29 @@ namespace Eva {
   }
   
   public class Tuple : Object, Term {
-    public Gee.List<Term?> value {get; construct;}
+    private Term[] elements {get; set;}
+    
+    public Tuple(Term[] terms) {
+      elements = terms;
+    }
+    
+    public int size {
+      get {
+        return elements.length;
+      }
+    }
     
-    public Tuple() {
-      Gee.List<Term?> list = new Gee.ArrayList<Term?>();
-      Object(value: list);
+    public new unowned Term get(int i) {
+      assert(i >= 0 && i < size);
+      
+      return elements[i];
     }
     
     public string to_string() {
       string ret = "{";
       bool first = true;
       
-      foreach(Term term in value) {
+      foreach(Term term in elements) {
         if(first) {
           first = false;
           ret += term.to_string();
@@ -303,11 +314,11 @@ namespace Eva {
       
       Tuple t = o as Tuple;
       
-      if(t.value.size != value.size)
+      if(t.size != size)
         return false;
       
-      for(int i = 0; i < value.size; ++i) {
-        if(!value[i].do_match(t.value[i], vars, aliases))
+      for(int i = 0; i < size; ++i) {
+        if(!this[i].do_match(t[i], vars, aliases))
           return false;
       }
       
@@ -315,9 +326,9 @@ namespace Eva {
     }
     
     public void encode(Erl.Buffer buffer) {
-      buffer.encode_tuple_header(value.size);
+      buffer.encode_tuple_header(size);
       
-      foreach(Term term in value) {
+      foreach(Term term in elements) {
         term.encode(buffer);
       }
     }
-- 
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