68 lines
1.4 KiB
Nim
68 lines
1.4 KiB
Nim
import unittest, typetraits
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type
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TFoo[T, U] = object
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x: T
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y: U
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proc getTypeName1(t: typedesc): string = t.name
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proc getTypeName2(t: type): string = t.name
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proc foo(T: type float, a: auto): string =
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result = "float " & $(a.len > 5)
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proc foo(T: typedesc[TFoo], a: int): string =
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result = "TFoo " & $(a)
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proc foo(T: type[int or bool]): string =
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var a: T
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a = 10
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result = "int or bool " & ($a)
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template foo(T: typedesc[seq]): string = "seq"
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test "types can be used as proc params":
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# XXX: `check` needs to know that TFoo[int, float] is a type and
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# cannot be assigned for a local variable for later inspection
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check ((string.getTypeName1 == "string"))
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check ((getTypeName2(int) == "int"))
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check ((foo(TFoo[int, float], 1000) == "TFoo 1000"))
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var f = 10.0
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check ((foo(float, "long string") == "float true"))
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check ((foo(type(f), [1, 2, 3]) == "float false"))
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check ((foo(int) == "int or bool 10"))
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check ((foo(seq[int]) == "seq"))
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check ((foo(seq[TFoo[bool, string]]) == "seq"))
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template accept(x) =
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static: assert(compiles(x))
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template reject(x) =
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static: assert(not compiles(x))
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var
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si: seq[int]
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ss: seq[string]
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proc foo(T: typedesc[seq], s: T) =
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discard
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accept:
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foo seq[int], si
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reject:
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foo seq[string], si
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reject:
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foo seq[int], ss
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# issue #12398
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reject:
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let xs = [int, float, string]
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reject:
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let data = @[int, typedesc]
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