diff options
| -rw-r--r-- | gc.c | 10 |
1 files changed, 10 insertions, 0 deletions
@@ -2339,6 +2339,16 @@ id2ref(VALUE obj, VALUE objid) * * The same number will be returned on all calls to +object_id+ for a given object, * and no two active objects will share an id. + * + * Note that some objects of builtin classes are reused for optimization. + * This is the case for immediate values and frozen string litterals. + * Immediate values are not passed by reference by are passed by value: + * +nil+, +true+, +false+, Fixnums. Some Floats may be immediates too. + * + * Object.new.object_id == Object.new.object_id # => false + * (21 * 2).object_id == (21 * 2).object_id # => true + * "hello".object_id == "hello".object_id # => false + * "hi".freeze.object_id == "hi".freeze.object_id # => true */ /* |