diff options
Diffstat (limited to 'hash.c')
-rw-r--r-- | hash.c | 33 |
1 files changed, 33 insertions, 0 deletions
@@ -11,6 +11,7 @@ **********************************************************************/ +#include "eval_intern.h" #include "ruby/ruby.h" #include "ruby/st.h" #include "ruby/util.h" @@ -623,6 +624,37 @@ rb_hash_default_proc(VALUE hash) return Qnil; } +/* + * call-seq: + * hsh.default_proc = proc_obj => proc_obj + * + * Sets the default proc to be executed on each key lookup. + * + * h.default_proc = proc do |hash, key| + * hash[key] = key + key + * end + * h[2] #=> 4 + * h["cat"] #=> "catcat" + */ + +static VALUE +rb_hash_set_default_proc(VALUE hash, VALUE proc) +{ + VALUE b; + + rb_hash_modify(hash); + b = rb_check_convert_type(proc, T_DATA, "Proc", "to_proc"); + if (NIL_P(b) || !rb_obj_is_proc(b)) { + rb_raise(rb_eTypeError, + "wrong default_proc type %s (expected Proc)", + rb_obj_classname(proc)); + } + proc = b; + RHASH(hash)->ifnone = proc; + FL_SET(hash, HASH_PROC_DEFAULT); + return proc; +} + static int key_i(VALUE key, VALUE value, VALUE *args) { @@ -2596,6 +2628,7 @@ Init_Hash(void) rb_define_method(rb_cHash,"default", rb_hash_default, -1); rb_define_method(rb_cHash,"default=", rb_hash_set_default, 1); rb_define_method(rb_cHash,"default_proc", rb_hash_default_proc, 0); + rb_define_method(rb_cHash,"default_proc=", rb_hash_set_default_proc, 1); rb_define_method(rb_cHash,"key", rb_hash_key, 1); rb_define_method(rb_cHash,"index", rb_hash_index, 1); rb_define_method(rb_cHash,"size", rb_hash_size, 0); |