14 May
2020
14 May
'20
2:25 p.m.
On Wed, 13 May 2020, Rich Morin wrote:
Fortran argument passing to functions is call by reference. Some
compilers had a non-standard exception to allow call by value.
A Fortran implementation I used years ago kept
constants in a "literal
pool". So, if you called a subroutine, passing in a constant, there was
a possibility that the constant might be modified upon the routine's
return. I don't recall this ever causing a problem in practice, but the
possibility was amusing...
As I dimly recall, Fortran has always used call by value/result (or
whatever the term is). So, if you modify an argument that happened to be
passed as a constant...