feat: starting implementation

options.go

@@ -0,0 +1,34 @@
+package ring
+
+import "fmt"
+
+const DefaultGrowthFactor = 2
+
+const DefaultCapacity = 16
+
+type config struct {
+	capacity     uint64
+	growthFactor uint64
+}
+
+type Option func(*config)
+
+func GrowthFactor(value int) Option {
+	if value <= 1 {
+		panic(fmt.Errorf("go-ring: growth factor must be greater than 1, got %d", value))
+	}
+
+	return func(c *config) {
+		c.growthFactor = uint64(value)
+	}
+}
+
+func Capacity(value int) Option {
+	if value < 0 {
+		panic(fmt.Errorf("go-ring: starting capacity must be non-negative, got %d", value))
+	}
+
+	return func(c *config) {
+		c.capacity = uint64(value)
+	}
+}