Draft: adding cpp version of codes

What is the new feature

Creating the C++ version of existing code

The people involved in porting the existing codes to C++ are @b382190, @b382899, @m301159, @k202204, @k202194, @k202174 and @k202170

Mandatory steps before review

• Gitlab CI passes (Hint: use make format for linting)
• New feature is covered by additional unit tests
• Mark the merge request as ready by removing Draft:

Mandatory steps before merge

• Reviewed by a maintainer
• Incorporate review suggestions
• Remember to edit the commit message and select the proper changelog category (feature/bugfix/other)
• Prior to merging, please remove any boilerplate from the MR description, retaining only the Please describe your feature in a couple of words and describe important implementation details of the feature section to maintain

You are not supposed to merge this request by yourself, the maintainers of libiconmath take care of this action!

src/support/mo_math_utilities.F90

@@ -79,7 +79,11 @@ MODULE mo_math_utilities
   PUBLIC :: line_intersect
   PUBLIC :: lintersect
   PUBLIC :: tdma_solver
+#ifndef __USE_CPP_BINDINGS
   PUBLIC :: tdma_solver_vec
+#else
+  PUBLIC :: tdma_solver_vec_double
+#endif
   PUBLIC :: check_orientation
 
   !  vertical coordinates routines
@@ -242,14 +246,14 @@ CONTAINS
 
   ! C++ binding for tdma_solver_vec
   INTERFACE
-    SUBROUTINE tdma_solver_vec(a, b, c, d, slev, elev, startidx, endidx, nrows, ncols, varout, opt_acc_queue) &
-      BIND(C, NAME="tdma_solver_vec")
+    SUBROUTINE tdma_solver_vec_double(a, b, c, d, slev, elev, startidx, endidx, nrows, ncols, varout, opt_acc_queue) &
+      BIND(C, NAME="tdma_solver_vec_double")
       IMPORT :: c_double, c_int
       REAL(c_double), INTENT(IN) :: a(*), b(*), c(*), d(*)
       INTEGER(c_int), VALUE :: slev, elev, startidx, endidx, nrows, ncols
       REAL(c_double), INTENT(OUT) :: varout(*)
       INTEGER(c_int), OPTIONAL :: opt_acc_queue
-    END SUBROUTINE tdma_solver_vec
+    END SUBROUTINE tdma_solver_vec_double
   END INTERFACE
 
 CONTAINS