Nim: Exclamation mark value before constant string

Question

Reading the macro documentation ( http://nim-lang.org/docs/macros.html ) I came across this piece of code:

nnkIdent(!"echo")

I tried to find the meaning of the exclamation mark, but couldn't find anything in the Nim documentation.

So: what is the difference between "string"

and !"string"

in Nim?

+3

daniel kullmann June 29. 15 at 8:44

1 answer

Kai sternad · Accepted Answer · 2015-06-29T09:03:35+0000

The exclamation point in this context is the syntax of the macro that creates the identifier. Here is the definition:

proc `!`(s: string): NimIdent {.magic: "StrToIdent", noSideEffect.}

builds id from string s