diff options
Diffstat (limited to 'docs/examples/userguide/external_C_code/struct_field_adaptation.pyx')
| -rw-r--r-- | docs/examples/userguide/external_C_code/struct_field_adaptation.pyx | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/docs/examples/userguide/external_C_code/struct_field_adaptation.pyx b/docs/examples/userguide/external_C_code/struct_field_adaptation.pyx new file mode 100644 index 000000000..cff6bbdc2 --- /dev/null +++ b/docs/examples/userguide/external_C_code/struct_field_adaptation.pyx @@ -0,0 +1,31 @@ +cdef extern from "struct_field_adaptation.h": + """ + #define HAS_NEWLY_ADDED_FIELD (C_LIB_VERSION >= 20) + + #if HAS_NEWLY_ADDED_FIELD + #define _mylib_get_newly_added_field(a_struct_ptr) ((a_struct_ptr)->newly_added_field) + #define _mylib_set_newly_added_field(a_struct_ptr, value) ((a_struct_ptr)->newly_added_field) = (value) + #else + #define _mylib_get_newly_added_field(a_struct_ptr) (0) + #define _mylib_set_newly_added_field(a_struct_ptr, value) ((void) (value)) + #endif + """ + + # Normal declarations provided by the C header file: + ctypedef struct StructType: + int field1 + int field2 + + StructType *get_struct_ptr() + + # Special declarations conditionally provided above: + bint HAS_NEWLY_ADDED_FIELD + int get_newly_added_field "_mylib_get_newly_added_field" (StructType *struct_ptr) + void set_newly_added_field "_mylib_set_newly_added_field" (StructType *struct_ptr, int value) + + +cdef StructType *some_struct_ptr = get_struct_ptr() + +print(some_struct_ptr.field1) +if HAS_NEWLY_ADDED_FIELD: + print(get_newly_added_field(some_struct_ptr)) |