refcount

Documentation

Index

• func Decrement(refCounter string, value uint) uint
• func Get(refCounter string) uint
• func Increment(refCounter string, value uint) uint

Examples

• Decrement
• Increment

Functions

func Decrement

func Decrement(refCounter string, value uint) uint

Decrement decreases a refCounter by the value. If the ref counter doesn't exist, a new one is created. The counter's new value is returned. A counter cannot be decreased below zero.

Example

refCounter1 := "testdec1"
fmt.Println(Increment(refCounter1, 10))
fmt.Println(Decrement(refCounter1, 1))
fmt.Println(Decrement(refCounter1, 2))

refCounter2 := "testdec2"
fmt.Println(Decrement(refCounter2, 1))
fmt.Println(Increment(refCounter2, 1))
fmt.Println(Decrement(refCounter2, 1))
fmt.Println(Decrement(refCounter2, 1))

Output:

10
9
7
0
1
0
0

func Get

func Get(refCounter string) uint

Get returns the current value of the refCounter.

func Increment

func Increment(refCounter string, value uint) uint

Increment increases a refCounter by the value. If the ref counter doesn't exist, a new one is created. The counter's new value is returned.

Example

refCounter1 := "testinc1"
fmt.Println(Increment(refCounter1, 1))
fmt.Println(Increment(refCounter1, 1))
fmt.Println(Increment(refCounter1, 2))

refCounter2 := "testinc2"
fmt.Println(Increment(refCounter2, 1))
fmt.Println(Increment(refCounter2, 10))

// Test overflow panic.
defer func() {
	r := recover()
	if r != nil {
		fmt.Printf("Recovered: %v\n", r)
	}
}()
var maxUint uint = ^uint(0)
fmt.Println(Increment(refCounter2, maxUint))

Output:

1
2
4
1
11
Recovered: Ref counter "testinc2" overflowed from 11 to 10