[TUHS] C declarations.

Richard Tobin richard at inf.ed.ac.uk
Sun May 14 09:11:21 AEST 2017


> Fortran, for the record, passes nearly everything by reference

Sort of.  The Fortran 77 standard imposes restrictions that appear to
be intended to allow the implementation to pass by value-and-result
(i.e. values are copied in, and copied back at return).  In particular
it disallows aliasing that would allow you to distinguish between
the two methods:

  If a subprogram reference causes a dummy argument in the referenced
  subprogram to become associated with another dummy argument in the
  referenced subprogram, neither dummy argument may become defined
  during execution of that subprogram.

http://www.fortran.com/F77_std/rjcnf-15.html#sh-15.9.3.6

-- Richard

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