Use pointers more and indexes less

diff --git a/planeteer.go b/planeteer.go
index 87c74486583e3b835854bfe61b2ae84e4eaacecd..57f00ecc0780668ce6bf00f08ff8f121542c9da7 100644 (file)
--- a/planeteer.go
+++ b/planeteer.go
@@ -31,16 +31,16 @@ type Commodity struct {
        CanSell   bool
        Limit     int
 }
-
+type Planet struct {
+       Name     string
+       BeaconOn bool
+       /* Use relative prices rather than absolute prices because you
+          can get relative prices without traveling to each planet. */
+       RelativePrices map [string] int
+}
 type planet_data struct {
        Commodities []Commodity
-       Planets []struct {
-               Name     string
-               BeaconOn bool
-               /* Use relative prices rather than absolute prices because you
-                  can get relative prices without traveling to each planet. */
-               RelativePrices map [string] int
-       }
+       Planets []Planet
 }
 
 func ReadData() (data planet_data) {
@@ -56,22 +56,17 @@ func ReadData() (data planet_data) {
        return
 }
 
-func TradeValue(data planet_data,
-                from_index, to_index, commodity_index, quantity int) int {
-
-       commodity := &data.Commodities[commodity_index]
+func TradeValue(from, to *Planet,
+                commodity *Commodity,
+                quantity int) int {
        if !commodity.CanSell {
                return 0
        }
-
-       from_planet := &data.Planets[from_index]
-       from_relative_price, from_available := from_planet.RelativePrices[commodity.Name]
+       from_relative_price, from_available := from.RelativePrices[commodity.Name]
        if !from_available {
                return 0
        }
-
-       to_planet := &data.Planets[to_index]
-       to_relative_price, to_available := to_planet.RelativePrices[commodity.Name]
+       to_relative_price, to_available := to.RelativePrices[commodity.Name]
        if !to_available {
                return 0
        }
@@ -91,7 +86,10 @@ func FindBestTrades(data planet_data) [][]*Commodity {
                for to_index := range data.Planets {
                        best_gain := 0
                        for commodity_index := range data.Commodities {
-                               gain := TradeValue(data, from_index, to_index, commodity_index, 1)
+                               gain := TradeValue(&data.Planets[from_index],
+                                                  &data.Planets[to_index],
+                                                  &data.Commodities[commodity_index],
+                                                  1)
                                if gain > best_gain {
                                        best[from_index][to_index] = &data.Commodities[commodity_index]
                                        gain = best_gain