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Re: indexing expression performance
From: |
John W. Eaton |
Subject: |
Re: indexing expression performance |
Date: |
Sat, 17 Jan 2009 14:51:36 -0500 |
On 17-Jan-2009, Jaroslav Hajek wrote:
| For using them from Fortran, no, you can use the implicit interface
| generated for every call. For using them from C, a header file can be
| written. So far I didn't do it, because it appears that providing it
| is actually inconvenient for C++; in C++, it's more convenient to use
| references than pointers (as in Octave's sources).
You could write a header with some macro goo something like this:
#if defined __cplusplus && defined (QRUPDATE_USE_REFERENCES)
#define QRUPDATE_PTR_ARG(T) T&
#else
#define QRUPDATE_PTR_ARG(T) T*
#endif
#if defined (__cplusplus)
extern "C" {
#endif
F77_FUNC_RET_T
F77_FUNC (qrupdatefcn, QRUPDATEFCN) (const QRUPDATE_PTR_ARG (double),
QRUPDATE_PTR_ARG (double), int)
...
#if defined (__cplusplus)
}
#endif
But I'm not sure it is really worth it.
jwe