tango v1.0.0+2.066 (2014-08-19T00:10:20Z)

__signbitd

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.

version(!DigitalMarsWin32 && !linux && darwin)

extern (C)

int

__signbitd

(

double x

)

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