[SOLVED] Difference between where {T} and where T and infix operators

#1

Hello !
[english is not my native language. So if you don’t understand, tell me, I’ll try to say otherwise]
First, thanks to all Julia’s developpers. I discovered this language yesterday, and I find it really nice !

Second, I’m reading the doc, and have beginner questions,

  • Is there a difference between same_type(x::T,y::T) where T = true and same_type(x::T,y::T) where {T} = true ? I tried both and it seems to me that they work same.
  • Does there exist in Julia user-defined infix operators ?

Thanks ! :slight_smile:

0 Likes

#2

Welcome!

With just one type var, the two are identical. The curly braces are a convenient shorthand when you have more than one variable — it’s just where {T,S} instead of where S where T.

It also makes it a bit easier for me to read where {T} = ... since otherwise my brain wants to make it seem like you’re assigning the function body to just T.

(Also your English is great)

2 Likes

#3

Oh and as to your second question, there’s a limited number of names that can be used as infix operators, but all of them can be used for your own purposes. See https://docs.julialang.org/en/v1/manual/mathematical-operations/#Operator-Precedence-and-Associativity-1 (and the link to parser.scm) for the list and precedences.

2 Likes

#4

Thanks for your quick replies !

So, its not possible to have user-defined infix operator symbol ? :frowning: Hm, this programming language can’t be perfect-like :slight_smile:

If I have other questions, at a moment, should I open another topic ? Or write them down here ?

0 Likes

#5

You can’t invent your own symbols entirely, but you can choose from a long list of existing unicode symbols — check the parser.scm link. Most of these have no existing operator meaning.

0 Likes

#6

It’s better to open a new topic for a new question. That helps keep the conversations clearer and easier to read for future users.

1 Like

#7

oh ! I havn’t seen the link to parser.csm (sorry mbauman). thanks :slight_smile:

And, ok rdeits, i’ll do so !

Thanks for your replies to you !

0 Likes