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37 lines
785 B
Nim
37 lines
785 B
Nim
discard """
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file: "tgenericshardcases.nim"
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output: "2\n5\n126\n3"
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"""
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import typetraits
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proc typeNameLen(x: typedesc): int {.compileTime.} =
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result = x.name.len
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macro selectType(a, b: typedesc): typedesc =
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result = a
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type
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Foo[T] = object
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data1: array[T.high, int]
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data2: array[typeNameLen(T), float] # data3: array[0..T.typeNameLen, selectType(float, int)]
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MyEnum = enum A, B, C, D
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var f1: Foo[MyEnum]
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var f2: Foo[int8]
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echo high(f1.data1) # (D = 3) - 1 == 2
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echo high(f1.data2) # (MyEnum.len = 6) - 1 == 5
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echo high(f2.data1) # 127 - 1 == 126
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echo high(f2.data2) # int8.len - 1 == 3
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#static:
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# assert high(f1.data1) == ord(D)
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# assert high(f1.data2) == 6 # length of MyEnum
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# assert high(f2.data1) == 127
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# assert high(f2.data2) == 4 # length of int8
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