/*
 *  call-seq:
 *     enum.all? [{|obj| block } ]   => true or false
 *
 *  Passes each element of the collection to the given block. The method
 *  returns <code>true</code> if the block never returns
 *  <code>false</code> or <code>nil</code>. If the block is not given,
 *  Ruby adds an implicit block of <code>{|obj| obj}</code> (that is
 *  <code>all?</code> will return <code>true</code> only if none of the
 *  collection members are <code>false</code> or <code>nil</code>.)
 *
 *     %w{ant bear cat}.all? {|word| word.length >= 3}   #=> true
 *     %w{ant bear cat}.all? {|word| word.length >= 4}   #=> false
 *     [ nil, true, 99 ].all?                            #=> false
 *
 */

static VALUE
enum_all(VALUE obj)
{
    VALUE result = Qtrue;

    rb_block_call(obj, id_each, 0, 0, rb_block_given_p() ? all_iter_i : all_i, (VALUE)&result);
    return result;
}