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https://github.com/nim-lang/Nim.git
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22dc76a361
types are now valid proc/template/macro params and you can overload over them:
proc foo(T: typedesc) # accept any type
proc foo(T: typedesc{int}) # overload specifically for int
proc foo(T: typedesc{int or float or Callable}) # overload for any type matching the constraints
expr{type} is a param expecting compile time value of the designated type (or type class).
when typedesc or expr params are used with a proc, the proc will be instantiated once
for each unique type/value used as parameter.
18 lines
248 B
Nim
18 lines
248 B
Nim
discard """
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msg: "test 1\ntest 2"
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output: "TEST 1\nTEST 2\nTEST 2"
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"""
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import strutils
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proc foo(s: expr{string}): string =
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static: echo s
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const R = s.toUpper
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return R
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echo foo("test 1")
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echo foo("test 2")
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echo foo("test " & $2)
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