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Support casting inf --> System.Double.PositiveInfinity #100

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dhirschfeld opened this issue Sep 9, 2015 · 3 comments
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Support casting inf --> System.Double.PositiveInfinity #100

dhirschfeld opened this issue Sep 9, 2015 · 3 comments

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@dhirschfeld
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Unless I'm mistaken there's no way to pass an infinity through to C# from Python?

namespace Demo {
    public static class TestDoubleCast {
        public static double PassThru(double arg) {
            return arg;
        }
    }
}
In [3]: from Demo import TestDoubleCast

In [4]: TestDoubleCast.PassThru(1)
Out[4]: 1.0

In [5]: TestDoubleCast.PassThru(3.14159)
Out[5]: 3.14159

In [6]: TestDoubleCast.PassThru(inf)
Traceback (most recent call last):

  File "<ipython-input-6-b27dffdb9fe9>", line 1, in <module>
    TestDoubleCast.PassThru(inf)

TypeError: No method matches given arguments


In [7]: TestDoubleCast.PassThru(System.Double.PositiveInfinity)
Traceback (most recent call last):

  File "<ipython-input-9-9828c102a734>", line 1, in <module>
    TestDoubleCast.PassThru(System.Double.PositiveInfinity)

TypeError: No method matches given argument


In [10]: System.Double(3.14159)  # works as expected
Out[10]: <System.Double at 0xaf31828>

In [11]: System.Double(inf)  # would like it to return a System.Double
Traceback (most recent call last):

  File "<ipython-input-11-1a15035c8521>", line 1, in <module>
    System.Double(inf)

OverflowError: value too large to convert

It would be very useful if the casting machinery could special case infinities so that you could create them from Python and they could be passed as arguments to methods expecting a System.Double
@den-run-ai
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@dhirschfeld this is because of this code to avoid passing infinite values:

https://github.com/pythonnet/pythonnet/blob/develop/src/runtime/converter.cs#L688
https://github.com/pythonnet/pythonnet/blob/develop/src/runtime/converter.cs#L701

I agree that it is up to the developer to handle this in the user code, not throwing exceptions in pythonnet.

@tonyroberts do you agree?

@den-run-ai den-run-ai mentioned this issue Jun 13, 2017
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@den-run-ai
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@dhirschfeld this should now be resolved: #487

@Konstantin-Posudevskiy
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@denfromufa could you close this issue, as it is resolved with #487?

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@dhirschfeld @Konstantin-Posudevskiy @den-run-ai