On 2/26/13 6:05 PM, N.M. Maclaren wrote:

On Feb 26 2013, Craig Rasmussen wrote:

...

I don't know what Bill will think of this but I think the problem should be resolved in the Fortran standard in the end so that

LOGICAL(C_INT)

is a legal type. This would allow mapping Fortran logical variables to C integers which is the type most C programmers use for logical variables anyway.

An interesting thought - a VERY interesting thought! The name C_INT wouldn't do, because kinds are specific to a type, but that's a detail. I can't think of any reason that it wouldn't work.

If you want a name, how about MPI_LOGICAL_KIND? We already have MPI_INTEGER_KIND for integers. Since this is peculiar to the MPI environment, I'm not keen on adding something to Fortran. Cheers, Bill

...

Does anyone know what size a default logical is in existing compilers? I assume it is the same size as a default integer.

It had better be - that's required by the standard, and has been since Fortran II.

Regards, Nick Maclaren.

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