Re: Templates and imports

2020-02-26 Thread juancarlospaco 
[https://github.com/nim-lang/Nim/wiki/Nim-for-Python-Programmers#Templates](https://github.com/nim-lang/Nim/wiki/Nim-for-Python-Programmers#Templates)

Far from perfect, but better than nothing, Templates explanation.

Re: Templates and imports

2020-02-26 Thread Hlaaftana 
use bind


import strutils

template test_template*() =
  bind formatFloat
  echo (1.0/3.0).formatFloat(precision=3)

proc test_proc*() =
  echo (1.0/3.0).formatFloat(precision=3)


Run

[https://nim-lang.org/docs/manual.html#generics-bind-statement](https://nim-lang.org/docs/manual.html#generics-bind-statement)

Re: Templates and imports

2020-02-26 Thread doofenstein 
it works if you change the template:


template test_template*() =
  echo formatFloat((1.0/3.0), precision=3)


Run

See 
[https://nim-lang.org/docs/manual.html#templates-limitations-of-the-method-call-syntax](https://nim-lang.org/docs/manual.html#templates-limitations-of-the-method-call-syntax)
 and 
[https://nim-lang.org/docs/manual.html#generics-symbol-lookup-in-generics](https://nim-lang.org/docs/manual.html#generics-symbol-lookup-in-generics)

Re: Templates and imports

2020-02-26 Thread solo989 
Your code works @treeform as long as you fix the typo in tempalte 


proc b() =
  echo "hi"

template a*() =
  b()


Run

Inside template a, b is a sym,closedSymChoice or openSymChoice so it works 
regardless of whether or not b is private or not.

Re: Templates and imports

2020-02-26 Thread treeform 
Hmm, I think it always worked like this. Template just substitute code. If the 
code where you have template can't access some thing... then it's an error.

It also is an error if template calls a private proc: 


proc b() = # private b
  echo "hi"

tempalte a*() = # public a
  b()


Run

Calling a() in another module will not work because b() is private.

Re: Templates and imports

2020-02-26 Thread solo989 
It works if you define it like this: 


# test.nim
import strutils

template test_template*() =
  echo formatFloat(1.0/3.0,precision=3)
  #echo (1.0/3.0).formatFloat(precision=3)

proc test_proc*() =
  echo (1.0/3.0).formatFloat(precision=3)


Run

Still seems like a bug.

Templates and imports

2020-02-26 Thread c0ntribut0r 
Hello folks,

Does anyone know why templates don't "auto-import" symbols defined in their 
residence file? :( Minimal example:


# test.nim
import strutils

template test_template*() =
  echo (1.0/3.0).formatFloat(precision=3)

proc test_proc*() =
  echo (1.0/3.0).formatFloat(precision=3)


Run


# other.nim
import test

test_proc()  # ok
test_template()  # fail:
# /tmp/other.nim(4, 14) template/generic instantiation of `test_template` 
from here
# /tmp/test.nim(5, 17) Error: attempting to call undeclared routine: 
'formatFloat'


Run

Is it a new feature or a bug? I think it worked in a different way some time 
ago.


Nim Compiler Version 1.1.1 [Linux: amd64]
Compiled at 2020-02-25
git hash: db540a0223480134598fb4806c55510cdef36bf1


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