Add `NUM2PTR` and `PTR2NUM` macros

These macros have been defined here and there, so collect them.

1 files changed, 2 insertions, 0 deletions

diff --git a/spec/ruby/optional/capi/ext/digest_spec.c b/spec/ruby/optional/capi/ext/digest_spec.c
index 9993238cf2..65c8defa20 100644
--- a/spec/ruby/optional/capi/ext/digest_spec.c
+++ b/spec/ruby/optional/capi/ext/digest_spec.c
@@ -135,7 +135,9 @@ VALUE digest_spec_context_size(VALUE self, VALUE meta) {
     return SIZET2NUM(algo->ctx_size);
 }
 
+#ifndef PTR2NUM
 #define PTR2NUM(x) (rb_int2inum((intptr_t)(void *)(x)))
+#endif
 
 VALUE digest_spec_context(VALUE self, VALUE digest) {
     return PTR2NUM(context);