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container tweaks

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This commit is contained in:
Josh Deprez 2021-09-30 17:02:10 +10:00
parent fb2c9a1474
commit 106ecb6d0c
1 changed files with 13 additions and 7 deletions
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14
engine/container.go
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@ -51,14 +51,12 @@ func (c *Container) GobEncode() ([]byte, error) {
return buf.Bytes(), nil return buf.Bytes(), nil
} }
// Prepare ensures the helper data structures are present. // Prepare ensures the helper data structures are present and valid.
func (c *Container) Prepare(*Game) error { func (c *Container) Prepare(*Game) error {
if c.reverse == nil {
c.reverse = make(map[interface{}]int, len(c.items)) c.reverse = make(map[interface{}]int, len(c.items))
for i, x := range c.items { for i, x := range c.items {
c.reverse[x] = i c.reverse[x] = i
} }
}
return nil return nil
} }
@ -130,7 +128,12 @@ func (c *Container) ItemCount() int {
func (c *Container) Element(i int) interface{} { return c.items[i] } func (c *Container) Element(i int) interface{} { return c.items[i] }
// Len returns the number of items plus the number of free slots in the container. // Len returns the number of items plus the number of free slots in the container.
func (c *Container) Len() int { return len(c.items) } func (c *Container) Len() int {
if c == nil {
return 0
}
return len(c.items)
}
// Swap swaps any two items, free slots, or a combination. // Swap swaps any two items, free slots, or a combination.
func (c *Container) Swap(i, j int) { func (c *Container) Swap(i, j int) {
@ -144,6 +147,9 @@ func (c *Container) Swap(i, j int) {
} }
func (c *Container) String() string { func (c *Container) String() string {
if c == nil {
return "Container(nil)"
}
return "Container" + fmt.Sprint(c.items) return "Container" + fmt.Sprint(c.items)
} }