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Improve example with concurrency support (#573)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,4 +1,37 @@ | ||
| package godogs | ||
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| // Godogs available to eat. | ||
| var Godogs int | ||
| import ( | ||
| "fmt" | ||
| ) | ||
|
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| // Godogs is an example behavior holder. | ||
| type Godogs int | ||
|
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| // Add increments Godogs count. | ||
| func (g *Godogs) Add(n int) { | ||
| *g = *g + Godogs(n) | ||
| } | ||
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| // Eat decrements Godogs count or fails if there is not enough available. | ||
| func (g *Godogs) Eat(n int) error { | ||
| ng := Godogs(n) | ||
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| if (g == nil && ng > 0) || ng > *g { | ||
| return fmt.Errorf("you cannot eat %d godogs, there are %d available", n, g.Available()) | ||
| } | ||
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| if ng > 0 { | ||
| *g = *g - ng | ||
| } | ||
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| return nil | ||
| } | ||
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| // Available returns the number of currently available Godogs. | ||
| func (g *Godogs) Available() int { | ||
| if g == nil { | ||
| return 0 | ||
| } | ||
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| return int(*g) | ||
| } |
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