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31 lines
639 B
Nim
31 lines
639 B
Nim
type
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VarContainer[T] = concept c
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put(var c, T)
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AltVarContainer[T] = concept var c
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put(c, T)
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NonVarContainer[T] = concept c
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put(c, T)
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GoodContainer = object
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x: int
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BadContainer = object
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x: int
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proc put(x: BadContainer, y: int) = discard
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proc put(x: var GoodContainer, y: int) = discard
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template ok(x) = assert(x)
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template no(x) = assert(not(x))
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static:
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ok GoodContainer is VarContainer[int]
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ok GoodContainer is AltVarContainer[int]
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no BadContainer is VarContainer[int]
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no BadContainer is AltVarContainer[int]
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ok GoodContainer is NonVarContainer[int]
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ok BadContainer is NonVarContainer[int]
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