Simpler "custom unit" example?

[dmoles]

It's not quite as clean as it would be in some languages since Go doesn't let you attach extension methods to existing types, but this seems easier than the int type + cast example:

const Parsec = 648000 * unit.AstronomicalUnit / math.Pi

func ToParsecs(l unit.Length) unit.Length {
	return l/Parsec
}

// could also be:
//
// func ToParsecs(l unit.Length) float64 {
// 	return float64(l/Parsec)
// }

func main() {
	fmt.Printf("1 pc = %f ly\n", Parsec.LightYears())
	fmt.Printf("1 ly = %f pc\n", ToParsecs(unit.LightYear))
}

Prints:

1 pc = 3.261564 ly
1 ly = 0.306601 pc

Is there an advantage to the type MyUnit int (or in this case I suppose type Parsec float64) approach over this?

[martinlindhe]

No advantage, its just a trivial usage example.

Feel free to submit a patch to update the readme with more examples if you want.

[soumya92]

@dmoles if you send a patch, I would also recommend adding a number, just for a more illustrative example, something like

func main() {
	fmt.Printf("8 pc = %f ly\n", (8 * Parsec).LightYears())
	fmt.Printf("4 ly = %f pc\n", ToParsecs(4 * unit.LightYear))
}

[martinlindhe]

I'm not changing anything right now.

Patches are welcome.

[dmoles]

Thanks. I'll submit a patch after I've played around a bit more with the library and have confidence in my example.