Re: Reading complex multidimensionalarrays from C

Richard Maine wrote:

(snip)

In fact, the f90 standard requires that *EVERY* real kind have a
corresponding complex kind. I have seen vendors try to rationalize that
they can support a quad precision real without also supporting a quad
precision complex, but I don't think that the rationalizations hold up.
The usual rationalization claims that the quad precision real is an
extension and thus that the requirement for a corresonding complex
doesn't apply.

However, I don't buy that rationalization because I don't think such
vendors actually implement quad precision real in a way that counts as
an extension. An extension can't make standard conforming code invalid;
if that happens, the compiler is violating the standard rather than
extending it. The distinction is critical.

If one implemented REAL*16, but not SELECTED_REAL_KIND(30)
would that qualify as an extension not requiring a corresponding
COMPLEX*32? Note that IBM has supported both REAL*16 and
COMPLEX*32 since somewhere around 1968.

-- glen



.

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