Can now determine the market value of balance pairs, even if stored within

value_t objects.

Makefile.am

@@ -12,6 +12,7 @@ libamounts_la_SOURCES  = \
 	src/amount.cc      \
 	src/commodity.cc   \
 	src/balance.cc     \
+	src/balpair.cc     \
 	src/value.cc       \
 			   \
 	src/token.cc       \

src/balpair.cc

@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2003-2008, John Wiegley.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * - Neither the name of New Artisans LLC nor the names of its
+ *   contributors may be used to endorse or promote products derived from
+ *   this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "balpair.h"
+
+namespace ledger {
+
+optional<balance_pair_t>
+balance_pair_t::value(const optional<datetime_t>&   moment,
+		      const optional<commodity_t&>& in_terms_of) const
+{
+  optional<balance_t> temp = quantity().value(moment, in_terms_of);
+  optional<balance_t> cost_temp;
+  if (cost)
+    cost_temp = cost->value(moment, in_terms_of);
+
+  if (temp) {
+    if (cost_temp)
+      return balance_pair_t(*temp, *cost_temp);
+    else if (cost)
+      return balance_pair_t(*temp, *cost);
+    else
+      return balance_pair_t(*temp);
+  }
+  return none;
+}
+
+} // namespace ledger

src/balpair.h

@@ -103,8 +103,7 @@ public:
   balance_pair_t(const balance_t& bal) : balance_t(bal) {
     TRACE_CTOR(balance_pair_t, "const balance_t&");
   }
-  balance_pair_t(const balance_t& bal,
-		 const balance_t& cost_bal)
+  balance_pair_t(const balance_t& bal, const balance_t& cost_bal)
     : balance_t(bal), cost(cost_bal) {
     TRACE_CTOR(balance_pair_t, "const balance_t&, const balance_t&");
   }
@@ -310,6 +309,10 @@ public:
     return *this;
   }
 
+  optional<balance_pair_t>
+  value(const optional<datetime_t>&   moment      = none,
+	const optional<commodity_t&>& in_terms_of = none) const;
+
   /**
    * Truth tests.  An balance pair may be truth tested by comparison
    * to another balance pair, or by using one of the inherited

src/value.cc

@@ -1299,25 +1299,26 @@ bool value_t::is_zero() const
   return false;
 }
 
-value_t value_t::value(const optional<datetime_t>& moment) const
+value_t value_t::value(const optional<datetime_t>&   moment,
+		       const optional<commodity_t&>& in_terms_of) const
 {
   switch (type()) {
   case INTEGER:
     return *this;
 
   case AMOUNT: {
-    if (optional<amount_t> val = as_amount().value(moment))
+    if (optional<amount_t> val = as_amount().value(moment, in_terms_of))
       return *val;
     return false;
   }
   case BALANCE: {
-    if (optional<balance_t> bal = as_balance().value(moment))
+    if (optional<balance_t> bal = as_balance().value(moment, in_terms_of))
       return *bal;
     return false;
   }
   case BALANCE_PAIR: {
-    if (optional<balance_t> bal_pair =
-	as_balance_pair().quantity().value(moment))
+    if (optional<balance_pair_t> bal_pair =
+	as_balance_pair().value(moment, in_terms_of))
       return *bal_pair;
     return false;
   }
@@ -1679,9 +1680,11 @@ void value_t::print(std::ostream& out, const bool relaxed) const
     break;
 
   case BALANCE:
-  case BALANCE_PAIR:
     out << as_balance();
     break;
+  case BALANCE_PAIR:
+    out << as_balance_pair();
+    break;
 
   case DATETIME:
     assert(false);

src/value.h

@@ -418,7 +418,8 @@ public:
   void    in_place_reduce();	// exists for efficiency's sake
 
   // Return the "market value" of a given value at a specific time.
-  value_t value(const optional<datetime_t>& moment = none) const;
+  value_t value(const optional<datetime_t>&   moment	  = none,
+		const optional<commodity_t&>& in_terms_of = none) const;
   value_t cost() const;