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https://github.com/nim-lang/Nim.git
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14b2354b7d
* rename 'lenTuple' to 'tupleLen' Rationale: `lenTuple` is a tuple consisting of lengths (e.g. `(1, 5, 0)`), `tupleLen` is a length of a tuple (e.g. `tupleLen((1, 5, 0) == 3`) * rename 'lenVarargs' to 'varargsLen' The same rationale as a previous commit. Consistency.
61 lines
1.4 KiB
Nim
61 lines
1.4 KiB
Nim
discard """
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output: '''
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tvarargslen.nim:35:9 (1, 2)
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tvarargslen.nim:36:9 12
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tvarargslen.nim:37:9 1
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tvarargslen.nim:38:8
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done
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'''
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"""
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## line 10
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template myecho*(a: varargs[untyped]) =
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## shows a useful debugging echo-like proc that is dependency-free (no dependency
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## on macros.nim) so can be used in more contexts
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const info = instantiationInfo(-1, false)
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const loc = info.filename & ":" & $info.line & ":" & $info.column & " "
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when varargsLen(a) > 0:
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echo(loc, a)
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else:
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echo(loc)
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template fun*(a: varargs[untyped]): untyped =
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varargsLen(a)
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template fun2*(a: varargs[typed]): untyped =
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a.varargsLen
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template fun3*(a: varargs[int]): untyped =
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a.varargsLen
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template fun4*(a: varargs[untyped]): untyped =
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len(a)
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proc main()=
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myecho (1, 2)
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myecho 1, 2
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myecho 1
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myecho()
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doAssert fun() == 0
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doAssert fun('a') == 1
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doAssert fun("asdf", 1) == 2
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doAssert fun2() == 0
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doAssert fun2('a') == 1
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doAssert fun2("asdf", 1) == 2
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doAssert fun3() == 0
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doAssert fun3(10) == 1
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doAssert fun3(10, 11) == 2
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## shows why `varargsLen` can't be named `len`
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doAssert fun4("abcdef") == len("abcdef")
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## workaround for BUG:D20191218T171447 whereby if testament expected output ends
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## in space, testament strips it from expected output but not actual output,
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## which leads to a mismatch when running test via megatest
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echo "done"
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main()
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