[ET Trac] [Einstein Toolkit] #967: GRHydro uses EOS_Omni routines without DECLARE_CCTK_FUNCTIONS

[Einstein Toolkit]

#967: GRHydro uses EOS_Omni routines without DECLARE_CCTK_FUNCTIONS
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  Reporter:  rhaas                  |       Owner:         
      Type:  defect                 |      Status:  new    
  Priority:  minor                  |   Milestone:         
 Component:  EinsteinToolkit thorn  |     Version:         
Resolution:                         |    Keywords:  GRHydro
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Comment (by eschnett):

 The syntax is (/rho_min/); the parentheses are necessary.

 No, this is only for variables that are read. If the variables are also
 written, then I would recommend using pointers (or temporary arrays with
 copy-in and copy-out, but this is cumbersome).

 {{{
   subroutine call_with_array(b)
     integer b
     integer a(1)
     pointer (pa,a)
     pa = loc(b)
     call wantarray(a)
   end
 }}}

 This defined a subroutine with a scalar argument b. The subroutine defines
 a pointer variable pa, pointing to an array. (No space is allocated for an
 array.) The pointer is set to the address of b. The pointer is
 dereferenced (in C parlance) by using its "other name". In C, this code
 corresponds to something like

 {{{
   int b;
   int[1] *pa;
   pa = &b;
   wantarray(*pa);
 }}}

 (except that int[1] is not a type in C, so one would have to wrap it into
 a structure, and this would make the C version of this example more
 complex than necessary).

-- 
Ticket URL: <https://trac.einsteintoolkit.org/ticket/967#comment:3>
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