From 5f30c790dbc4a3ff469eb350e98817edd38d5de8 Mon Sep 17 00:00:00 2001
From: John Wiegley <johnw@newartisans.com>
Date: Thu, 26 Aug 2004 02:01:29 -0400
Subject: fixed another memory strangeness (too much destruction)

---
 value.cc |  1 +
 value.h  | 69 +++++++++++++++++++++++++++++++++++++++++-----------------------
 walk.h   |  6 +++---
 3 files changed, 48 insertions(+), 28 deletions(-)

diff --git a/value.cc b/value.cc
index 83307dc0..7de21813 100644
--- a/value.cc
+++ b/value.cc
@@ -26,6 +26,7 @@ value_t& value_t::operator=(const value_t& value)
     return *this;
 
   destroy();
+
   switch (value.type) {
   case BOOLEAN:
     *((bool *) data) = *((bool *) value.data);
diff --git a/value.h b/value.h
index e2fbda66..b0687d64 100644
--- a/value.h
+++ b/value.h
@@ -37,7 +37,7 @@ class value_t
     type = INTEGER;
   }
 
-  value_t(const value_t& value) {
+  value_t(const value_t& value) : type(INTEGER) {
     DEBUG_PRINT("ledger.memory.ctors", "ctor value_t");
     *this = value;
   }
@@ -51,20 +51,17 @@ class value_t
     *((unsigned int *) data) = value;
     type = INTEGER;
   }
-  value_t(const amount_t& value) {
+  value_t(const amount_t& value) : type(INTEGER) {
     DEBUG_PRINT("ledger.memory.ctors", "ctor value_t");
-    new((amount_t *)data) amount_t(value);
-    type = AMOUNT;
+    *this = value;
   }
-  value_t(const balance_t& value) {
+  value_t(const balance_t& value) : type(INTEGER) {
     DEBUG_PRINT("ledger.memory.ctors", "ctor value_t");
-    new((balance_t *)data) balance_t(value);
-    type = BALANCE;
+    *this = value;
   }
-  value_t(const balance_pair_t& value) {
+  value_t(const balance_pair_t& value) : type(INTEGER) {
     DEBUG_PRINT("ledger.memory.ctors", "ctor value_t");
-    new((balance_pair_t *)data) balance_pair_t(value);
-    type = BALANCE_PAIR;
+    *this = value;
   }
 
   ~value_t() {
@@ -76,33 +73,55 @@ class value_t
 
   value_t& operator=(const value_t& value);
   value_t& operator=(const bool value) {
-    destroy();
-    *((bool *) data) = value;
-    type = BOOLEAN;
+    if ((bool *) data != &value) {
+      destroy();
+      *((bool *) data) = value;
+      type = BOOLEAN;
+    }
     return *this;
   }
   value_t& operator=(const unsigned int value) {
-    destroy();
-    *((unsigned int *) data) = value;
-    type = INTEGER;
+    if ((unsigned int *) data != &value) {
+      destroy();
+      *((unsigned int *) data) = value;
+      type = INTEGER;
+    }
     return *this;
   }
   value_t& operator=(const amount_t& value) {
-    destroy();
-    new((amount_t *)data) amount_t(value);
-    type = AMOUNT;
+    if ((amount_t *) data != &value) {
+      if (! value) {
+	return *this = 0U;
+      } else {
+	destroy();
+	new((amount_t *)data) amount_t(value);
+	type = AMOUNT;
+      }
+    }
     return *this;
   }
   value_t& operator=(const balance_t& value) {
-    destroy();
-    new((balance_t *)data) balance_t(value);
-    type = BALANCE;
+    if ((balance_t *) data != &value) {
+      if (value.amounts.size() == 1) {
+	return *this = (*value.amounts.begin()).second;
+      } else {
+	destroy();
+	new((balance_t *)data) balance_t(value);
+	type = BALANCE;
+      }
+    }
     return *this;
   }
   value_t& operator=(const balance_pair_t& value) {
-    destroy();
-    new((balance_pair_t *)data) balance_pair_t(value);
-    type = BALANCE_PAIR;
+    if ((balance_pair_t *) data != &value) {
+      if (! value.cost) {
+	return *this = value.quantity;
+      } else {
+	destroy();
+	new((balance_pair_t *)data) balance_pair_t(value);
+	type = BALANCE_PAIR;
+      }
+    }
     return *this;
   }
 
diff --git a/walk.h b/walk.h
index 39bde7f2..93a2a3b0 100644
--- a/walk.h
+++ b/walk.h
@@ -40,6 +40,9 @@ struct item_handler {
 
 template <typename T>
 class compare_items {
+  value_t left_result;
+  value_t right_result;
+
   const value_expr_t * sort_order;
 
  public:
@@ -52,9 +55,6 @@ class compare_items {
     assert(left);
     assert(right);
 
-    value_t left_result;
-    value_t right_result;
-
     sort_order->compute(left_result, details_t(left));
     sort_order->compute(right_result, details_t(right));
 
-- 
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