Arrays
The nice thing about arrays in ruby C extensions is that they act very much like the ruby arrays they represent. There are a few functions to know about:
- rb_ary_new() - create a new array with 0 elements. Elements can be added later using rb_ary_push(), rb_ary_store(), or rb_ary_unshift().
- rb_ary_new2(size) - create a new array with size elements
- rb_ary_store(array, index, value) - put the ruby value into array at index. This can be used to create sparse arrays; intervening elements that have not yet had values assigned will be set to nil
- rb_ary_push(array, value) - put value at the end of the array
- rb_ary_unshift(array, value) - put value at the start of the array
- rb_ary_pop(array) - pop the last element of array off and return it
- rb_ary_shift(array) - remove the first element of array and return it
- rb_ary_entry(array, index) - examine array element located at index without changing array
- rb_ary_dup(array) - copy array and return the copy
- rb_ary_to_s(array) - invoke the "to_s" method on the array. Note that this concatenates the array elements together without spacing, so is not generally useful
- rb_ary_join(array, string_object) - create a string by converting each element of the array to a string separated by string_object. If string_object is Qnil, then no separator is used
- rb_ary_reverse(array) - reverse the order of all of the elements in array
- rb_ary_to_ary(ruby_object) - create an array out of any ruby object. If the object is already an array, a reference to the same object is returned. If the object supports the "to_ary" method, then "to_ary" is invoked on the object and the result is returned. If neither of the previous are true, then a new array with 1 element containing the object is returned
An example should make most of this clear:
1) VALUE result, elem, arr2, mystr;
2)
3) result = rb_ary_new();
4) // result is now []
5) rb_ary_push(result, INT2FIX(1));
6) // result is now [1]
7) rb_ary_push(result, INT2FIX(2));
8) // result is now [1, 2]
9) rb_ary_unshift(result, INT2FIX(0));
10) // result is now [0, 1, 2]
11) rb_ary_store(result, 3, INT2FIX(3));
12) // result is now [0, 1, 2, 3]
13) rb_ary_store(result, 5, INT2FIX(5));
14) // result is now [0, 1, 2, 3, nil, 5]
15) elem = rb_ary_pop(result);
16) // result is now [0, 1, 2, 3, nil] and elem is 5
17) elem = rb_ary_shift(result);
18) // result is now [1, 2, 3, nil] and elem is 0
19) elem = rb_ary_entry(result, 0);
20) // result is now [1, 2, 3, nil] and elem is 1
21) arr2 = rb_ary_dup(result);
22) // result is now [1, 2, 3, nil] and arr2 is [1, 2, 3, nil]
23) mystr = rb_ary_to_s(result);
24) // result is now [1, 2, 3, nil] and mystr is 123
25) mystr = rb_ary_join(result, rb_str_new2("-"));
26) // result is now [1, 2, 3, nil] and mystr is 1-2-3-
27) rb_ary_reverse(result);
28) // result is now [nil, 3, 2, 1]
29) rb_ary_shift(result);
30) // result is now [3, 2, 1]
31) result = rb_ary_to_ary(rb_str_new2("hello"));
32) // result is now ["hello"]
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