Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.c++ > #88215

Re: best way to pass a multiple dimension variable to a method

Show all headers | View raw

On 12/21/2022 9:02 PM, Ben Bacarisse wrote:
> Lynn McGuire <lynnmcguire5@gmail.com> writes:
> 
>> On 12/21/2022 2:37 PM, Lynn McGuire wrote:
>>> What is the best way to pass a multiple dimension variable to a method in C++ ?
>>> For instance, in C you could do the following:
>>>       double xyz [5] [2] [14];
>>>       ...
>>>       amethod (xyz, ...);
> 
> Best is always going to depend on lost of as yet unspecified factors.
> Are the sizes (other than the "top-level" one) always know at compile
> time?  Are they always the same?
> 
>> I am looking at
>>     https://www.educba.com/3d-arrays-in-c-plus-plus/
> 
> That hardly scratches the surface!
> 
>> and
>>
>> https://stackoverflow.com/questions/8767166/passing-a-2d-array-to-a-c-function
> 
> C has variably modified types which means you can pass run-time array
> sizes to a C function.  C++ does not have this feature, but then that
> page includes some C++ and does not use variably modified types (as far
> as I could see).
> 
> You probably need to say more about your constraints to get better advice.

I don't know if the array sizes are always known at compile time.  I 
suspect that they are but I am far from sure.

I am moving a 750,000 line F77 / C calculation engine to C++ using a 
modified version of F2C.  F2C converts all multiple dimension arrays to 
single dimension arrays.  Sometimes I convert them back.  Still a few 
unknowns to work out.

Thanks,
Lynn

Back to comp.lang.c++ | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

best way to pass a multiple dimension variable to a method Lynn McGuire <lynnmcguire5@gmail.com> - 2022-12-21 14:37 -0600
  Re: best way to pass a multiple dimension variable to a method Richard Damon <Richard@Damon-Family.org> - 2022-12-21 17:10 -0500
  Re: best way to pass a multiple dimension variable to a method Lynn McGuire <lynnmcguire5@gmail.com> - 2022-12-21 16:18 -0600
    Re: best way to pass a multiple dimension variable to a method Öö Tiib <ootiib@hot.ee> - 2022-12-21 18:03 -0800
      Re: best way to pass a multiple dimension variable to a method David Brown <david.brown@hesbynett.no> - 2022-12-22 15:03 +0100
    Re: best way to pass a multiple dimension variable to a method Ben Bacarisse <ben.usenet@bsb.me.uk> - 2022-12-22 03:02 +0000
      Re: best way to pass a multiple dimension variable to a method Lynn McGuire <lynnmcguire5@gmail.com> - 2022-12-22 02:01 -0600
        Re: best way to pass a multiple dimension variable to a method Öö Tiib <ootiib@hot.ee> - 2022-12-22 00:25 -0800
        Re: best way to pass a multiple dimension variable to a method Ben Bacarisse <ben.usenet@bsb.me.uk> - 2022-12-22 12:13 +0000
  Re: best way to pass a multiple dimension variable to a method Paavo Helde <eesnimi@osa.pri.ee> - 2022-12-22 09:07 +0200
  Re: best way to pass a multiple dimension variable to a method Lynn McGuire <lynnmcguire5@gmail.com> - 2022-12-22 22:10 -0600
  Re: best way to pass a multiple dimension variable to a method Lynn McGuire <lynnmcguire5@gmail.com> - 2022-12-22 22:23 -0600

csiph-web