gitypeinfo: Add GI_TYPE_TAG_IS_NUMERIC macro

This is a convenience for bindings that want to perform a similar action
for all numeric types. It allows more expressive code in some cases:

if (GI_TYPE_TAG_IS_NUMERIC(tag)) {
  do_one_thing();
  return;
}

switch (tag) {
  case GI_TYPE_TAG_ARRAY:
    do_other_thing();
    return;
  /* ... */
  default:
    g_assert_not_reached();
}

instead of listing out all of the numeric types in the switch statement.

2 files changed, 12 insertions, 2 deletions

diff --git a/girepository/gitypeinfo.h b/girepository/gitypeinfo.h
index fd7d5be6..69d0dad6 100644
--- a/girepository/gitypeinfo.h
+++ b/girepository/gitypeinfo.h
@@ -48,6 +48,16 @@ G_BEGIN_DECLS
  */
 #define G_TYPE_TAG_IS_BASIC(tag) (tag < GI_TYPE_TAG_ARRAY || tag == GI_TYPE_TAG_UNICHAR)
 
+/**
+ * GI_TYPE_TAG_IS_NUMERIC:
+ * @tag: a type tag
+ *
+ * Checks if @tag is a numeric type. That is, integer or floating point.
+ *
+ * Since: 1.72
+ */
+#define GI_TYPE_TAG_IS_NUMERIC(tag) ((tag) >= GI_TYPE_TAG_INT8 && (tag) <= GI_TYPE_TAG_DOUBLE)
+
 GI_AVAILABLE_IN_ALL
 const gchar*           g_type_tag_to_string            (GITypeTag   type);
 
diff --git a/girepository/gitypes.h b/girepository/gitypes.h
index 83268e89..47df7903 100644
--- a/girepository/gitypes.h
+++ b/girepository/gitypes.h
@@ -411,7 +411,7 @@ typedef enum {
   /* Basic types */
   GI_TYPE_TAG_VOID      =  0,
   GI_TYPE_TAG_BOOLEAN   =  1,
-  GI_TYPE_TAG_INT8      =  2,
+  GI_TYPE_TAG_INT8      =  2,  /* Start of GI_TYPE_TAG_IS_NUMERIC types */
   GI_TYPE_TAG_UINT8     =  3,
   GI_TYPE_TAG_INT16     =  4,
   GI_TYPE_TAG_UINT16    =  5,
@@ -420,7 +420,7 @@ typedef enum {
   GI_TYPE_TAG_INT64     =  8,
   GI_TYPE_TAG_UINT64    =  9,
   GI_TYPE_TAG_FLOAT     = 10,
-  GI_TYPE_TAG_DOUBLE    = 11,
+  GI_TYPE_TAG_DOUBLE    = 11,  /* End of numeric types */
   GI_TYPE_TAG_GTYPE     = 12,
   GI_TYPE_TAG_UTF8      = 13,
   GI_TYPE_TAG_FILENAME  = 14,