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doc: add a Parameter evaluation order section (#15473)

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Delyan Angelov 2022-08-21 01:08:38 +03:00 committed by GitHub
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@ -68,6 +68,7 @@ It is easy, and it takes only a few seconds:
* [Variable number of arguments](#variable-number-of-arguments)
* [Anonymous & higher-order functions](#anonymous--higher-order-functions)
* [Closures](#closures)
* [Parameter evaluation order](#parameter-evaluation-order)
* [References](#references)
* [Constants](#constants)
* [Builtin functions](#builtin-functions)
@ -2527,6 +2528,23 @@ struct Node<T> {
To dereference a reference, use the `*` operator, just like in C.
### Parameter evaluation order
The evaluation order of the parameters of function calls is *NOT* guaranteed.
Take for example the following program:
```v
fn f(a1 int, a2 int, a3 int) {
dump(a1 + a2 + a3)
}
fn main() {
f(dump(100), dump(200), dump(300))
}
```
V currently does not guarantee, that it will print 100, 200, 300 in that order.
The only guarantee is that 600 (from the body of `f`), will be printed after all of them.
That *may* change in V 1.0 .
## Constants
```v