stats: clean up how templates are used on the data side.

This basically works by taking advantage of the curiously recurring template
pattern in an intelligent way so as to reduce the number of lines of code
and hopefully make things a little bit clearer.

src/base/statistics.cc

@@ -158,7 +158,7 @@ Info::less(Info *stat1, Info *stat2)
 bool
 Info::baseCheck() const
 {
-    if (!(flags & init)) {
+    if (!(flags & Stats::init)) {
 #ifdef DEBUG
         cprintf("this is stat number %d\n", id);
 #endif
@@ -175,55 +175,6 @@ Info::baseCheck() const
 }
 
 
-void
-FormulaBase::result(VResult &vec) const
-{
-    if (root)
-        vec = root->result();
-}
-
-Result
-FormulaBase::total() const
-{
-    return root ? root->total() : 0.0;
-}
-
-size_type
-FormulaBase::size() const
-{
-    if (!root)
-        return 0;
-    else
-        return root->size();
-}
-
-void
-FormulaBase::reset()
-{
-}
-
-bool
-FormulaBase::zero() const
-{
-    VResult vec;
-    result(vec);
-    for (off_t i = 0; i < vec.size(); ++i)
-        if (vec[i] != 0.0)
-            return false;
-    return true;
-}
-
-void
-FormulaBase::update(Info *)
-{
-}
-
-string
-FormulaBase::str() const
-{
-    return root ? root->str() : "";
-}
-
 Formula::Formula()
 {
     setInit();
@@ -255,6 +206,55 @@ Formula::operator+=(Temp r)
     return *this;
 }
 
+void
+Formula::result(VResult &vec) const
+{
+    if (root)
+        vec = root->result();
+}
+
+Result
+Formula::total() const
+{
+    return root ? root->total() : 0.0;
+}
+
+size_type
+Formula::size() const
+{
+    if (!root)
+        return 0;
+    else
+        return root->size();
+}
+
+void
+Formula::reset()
+{
+}
+
+bool
+Formula::zero() const
+{
+    VResult vec;
+    result(vec);
+    for (off_t i = 0; i < vec.size(); ++i)
+        if (vec[i] != 0.0)
+            return false;
+    return true;
+}
+
+void
+Formula::update()
+{
+}
+
+string
+Formula::str() const
+{
+    return root ? root->str() : "";
+}
+
 void
 check()
 {