isReady(File) -- whether a file has data available for reading

Synopsis

• Function: isReady

• Usage:

  isReady f

• Inputs:
  • a file
• Outputs:
  • a Boolean value, whether the input file f has data available for reading

Description

i1 : f = openInOut "!cat"

o1 = !cat

o1 : File

i2 : isReady f

o2 = false

i3 : f << "hi there" << flush;

i4 : isReady f

o4 = false