C++ RETURN_ENUMERATOR函数代码示例

static VALUE
env_delete_if(VALUE ehash, SEL sel)
{
    RETURN_ENUMERATOR(ehash, 0, 0);
    env_reject_bang(ehash, 0);
    return envtbl;
}

VALUE _Manager_each(VALUE self)
{
	RETURN_ENUMERATOR(self,0,NULL);
	for (uint i = 0; i < _manager->getNumAnimations(); ++i)
		rb_yield(wrap(_manager->getAnimationAtIdx(i)));
	return self;
}

/*
 * call-seq:
 *     each(*args) -> Enumerator
 *     each(*args) { |item| block } -> Enumerator
 *
 * Iterate over the collection, passing each item to a given block.
 * If no block was supplied, return an enumerator for the collection.
 *
 */
static VALUE rbpod_collection_each(VALUE self, VALUE argv)
{
    GList *current = NULL, *collection = TYPED_DATA_PTR(self, GList);
    VALUE klass, item, arguments;

    /* Return an enumerator if a block was not supplied. */
    RETURN_ENUMERATOR(self, 0, 0);

    /* What sort of items are we casting this data to? */
    klass = rb_funcall(self, rb_intern("type"), 0);

    /* Create a shallow copy of the passed arguments. */
    arguments = rb_ary_dup(argv);

    /* Prepend an empty element as a placeholder. */
    rb_ary_unshift(arguments, Qnil);

    /* If we were supplied a block, enumerate the entire list. */
    for (current = collection; current != NULL; current = g_list_next(current)) {
        /* TODO: Find a better workaround than this or Data_Wrap_Struct. */
        item = rb_class_new_instance_with_data(0, NULL, klass, current->data);
        rb_ary_store(arguments, 0, item);
        rb_yield_splat(arguments);
    }

    return self;
}

VALUE _each(VALUE self)
{
	RETURN_ENUMERATOR(self,0,NULL);
	for (uint i = 0; i < _self->getNumAffectors(); ++i)
		rb_yield(wrap( _self->getAffectorAtIdx(i)));
	return self;
}

/*
 *  call-seq:
 *    e.with_object(obj) {|(*args), memo_obj| ... }
 *    e.with_object(obj)
 *
 *  Iterates the given block for each element with an arbitrary
 *  object given, and returns the initially given object.
 *
 *  If no block is given, returns an enumerator.
 *
 */
static VALUE
enumerator_with_object(VALUE obj, SEL sel, VALUE memo)
{
    RETURN_ENUMERATOR(obj, 1, &memo);
    enumerator_block_call(obj, enumerator_with_object_i, memo);
    return memo;
}

/*
 * call-seq:
 *   each {|element| } -> self
 *   each -> Enumerator
 * 
 * interates the child Elements
 * ===Return value
 * self
*/
VALUE _each(VALUE self)
{
	RETURN_ENUMERATOR(self,0,NULL);
	for (size_t i = 0; i < _self->getChildCount(); ++i)
		rb_yield(wrap(_self->getChildElementAtIdx(i)));
	return self;
}

/*
 * call-seq:
 *   Kernel.each_backtrace_frame( & block )
 *
 * Return array of hashes with object and method frame information for backtrace.
 * Specifying number_of_frames will cause only the last number_of_frames to be returned.
 * Kernel.backtrace returns all frames including the current context (__method__/__callee__).
 */
VALUE rb_RPRuby_Sender_Kernel_each_backtrace_frame(	int		argc,
													VALUE*	args,
													VALUE	rb_self )	{

	rb_thread_t*			c_thread					= GET_THREAD();
	//	Get the current frame - we're doing a backtrace, so our current working frame to start is the first previous thread
	rb_control_frame_t*		c_current_context_frame		= RUBY_VM_PREVIOUS_CONTROL_FRAME( RUBY_VM_PREVIOUS_CONTROL_FRAME( c_thread->cfp ) );
	
	//	c_top_of_control_frame describes the top edge of the stack trace
	//	set c_top_of_control_frame to the first frame in <main>
    rb_control_frame_t*		c_top_of_control_frame	=	RUBY_VM_NEXT_CONTROL_FRAME( RUBY_VM_NEXT_CONTROL_FRAME( (void *)( c_thread->stack + c_thread->stack_size ) ) );
	
	VALUE	rb_stored_backtrace_array	=	Qnil;
	
	//	if we were passed a stored backtrace array, use it
	if (	argc == 1
		&&	TYPE( args[ 0 ] ) == T_ARRAY )	{
		rb_stored_backtrace_array	=	args[ 0 ];
	}
				
	//	for each control frame:
    while ( c_current_context_frame < c_top_of_control_frame ) {

		VALUE	rb_frame_hash;
		//	if we are using a stored backtrace we don't need to ask for a new hash
		if ( rb_stored_backtrace_array == Qnil )	{
			rb_frame_hash	=	rb_RPRuby_Sender_Kernel_internal_backtraceHashForControlFrame(	& c_current_context_frame );
		}
		else {
			rb_frame_hash	=	rb_ary_shift( rb_stored_backtrace_array );
		}

		if ( rb_frame_hash == Qnil )	{
			break;
		}
		
		//	if we try to iterate using an Enumerator we will lose our context
		if ( ! rb_block_given_p() )	{
			
			//	we solve this by assuming that the desired context is the moment when each_backtrace_frame is called
			//	this allows us to store the backtrace and iterate it as we want
			//	the only downside is that we have to get the entire backtrace first in order to store it
			rb_stored_backtrace_array	=	rb_RPRuby_Sender_Kernel_backtrace(	0,
																				NULL,
																				rb_self );
		
			RETURN_ENUMERATOR( rb_self, 1, & rb_stored_backtrace_array );
		}
		
		//	otherwise, yield the block
		rb_yield( rb_frame_hash );
		
		//	only move the frame if we are not using a stored backtrace
		if ( rb_stored_backtrace_array == Qnil )	{
			c_current_context_frame = RUBY_VM_PREVIOUS_CONTROL_FRAME( c_current_context_frame );		
		}
	}
	
	return Qnil;
}

/* call-seq:
 *	Etc::Group.each { |group| block }   ->	obj
 *	Etc::Group.each			    ->	Enumerator
 *
 * Iterates for each entry in the /etc/group file if a block is given.
 *
 * If no block is given, returns the Enumerator.
 *
 * The code block is passed a Group struct.
 *
 * Example:
 *
 *     require 'etc'
 *
 *     Etc::Group.each {|g|
 *       puts g.name + ": " + g.mem.join(', ')
 *     }
 *
 *     Etc::Group.collect {|g| g.name}
 *     Etc::Group.select {|g| !g.mem.empty?}
 *
 */
static VALUE
etc_each_group(VALUE obj)
{
    RETURN_ENUMERATOR(obj, 0, 0);
    each_group();
    return obj;
}

static VALUE
rb_set_each(VALUE set, SEL sel)
{
    RETURN_ENUMERATOR(set, 0, 0);
    CFSetApplyFunction((CFMutableSetRef)set, rb_set_each_callback, NULL);
    return Qnil;
}

/*
 * データベース内のオブジェクトを順番にブロックに渡す。
 *
 * @example すべてのオブジェクトの名前を表示する:
 *   database.each do |object|
 *     p object.name
 *   end
 *
 * @example すべてのオブジェクトの名前をID順で表示する:
 *   database.each(:order_by => :id) do |object|
 *     p object.name
 *   end
 *
 * @example すべてのオブジェクトの名前をキー名の降順で表示する:
 *   database.each(:order_by => :key, :order => :desc) do |object|
 *     p object.name
 *   end
 *
 * @overload each(options=nil)
 *   @macro [new] database.each.options
 *     @param options [::Hash]
 *     @yield [object]
 *     @option options :order
 *       +:asc+ または +:ascending+ を指定すると昇順にレコードを取
 *       り出す。（デフォルト）
 *       +:desc+ または +:descending+ を指定すると降順にレコードを
 *       取り出す。
 *     @option options :order_by (:key)
 *       +:id+ を指定するとID順にレコードを取り出す。
 *       +:key+ 指定するとキー順にレコードを取り出す。（デフォル
 *       ト）
 *   @macro database.each.options
 *
 * @overload each(options=nil)
 *   @macro database.each.options
 *   @option options :ignore_missing_object (false)
 *     Specify +true+ to ignore missing object. Otherwise, an exception is
 *     raised for missing object.
 *
 *   @since 2.0.5
 */
static VALUE
rb_grn_database_each (int argc, VALUE *argv, VALUE self)
{
    grn_ctx *context = NULL;
    grn_obj *database;
    grn_table_cursor *cursor;
    VALUE rb_cursor, rb_options, rb_order, rb_order_by;
    VALUE rb_ignore_missing_object;
    int flags = 0;
    grn_id id;
    VALUE exception;

    RETURN_ENUMERATOR(self, argc, argv);

    rb_grn_database_deconstruct(SELF(self), &database, &context,
                                NULL, NULL, NULL, NULL);

    rb_scan_args(argc, argv, "01", &rb_options);

    rb_grn_scan_options(rb_options,
                        "order", &rb_order,
                        "order_by", &rb_order_by,
                        "ignore_missing_object", &rb_ignore_missing_object,
                        NULL);

    flags |= rb_grn_table_cursor_order_to_flag(rb_order);
    flags |= rb_grn_table_cursor_order_by_to_flag(GRN_TABLE_PAT_KEY,
                                                  self,
                                                  rb_order_by);

    cursor = grn_table_cursor_open(context, database, NULL, 0, NULL, 0,
                                   0, -1,
                                   flags);
    rb_cursor = GRNTABLECURSOR2RVAL(Qnil, context, cursor);
    rb_iv_set(self, "cursor", rb_cursor);
    while ((id = grn_table_cursor_next(context, cursor)) != GRN_ID_NIL) {
        grn_obj *object;

        object = grn_ctx_at(context, id);
        if (!object && RTEST(rb_ignore_missing_object)) {
            context->rc = GRN_SUCCESS;
            continue;
        }

        exception = rb_grn_context_to_exception(context, self);
        if (!NIL_P(exception)) {
            rb_grn_object_close(rb_cursor);
            rb_iv_set(self, "cursor", Qnil);
            rb_exc_raise(exception);
        }

        if (object) {
            rb_yield(GRNOBJECT2RVAL(Qnil, context, object, GRN_FALSE));
        }
    }
    rb_grn_object_close(rb_cursor);
    rb_iv_set(self, "cursor", Qnil);

    return Qnil;
//.........这里部分代码省略.........

VALUE _Manager_each(VALUE self)
{
	RETURN_ENUMERATOR(self,0,NULL);
	//check if system is created
	wrap< CEGUI::System* >(self);
	wrap_each(_manager->getIterator());
	return self;
}

VALUE _each_child(VALUE self)
{
    RETURN_ENUMERATOR(self,0,NULL);
    size_t count = _self->GetChildCount();
    for(size_t i = 0; i < count; ++i)
        rb_yield(wrap(_self->Item(i)));
    return self;
}

VALUE _Manager_each_falagard(VALUE self)
{
	RETURN_ENUMERATOR(self,0,NULL);
	//check if system is created
	wrap< CEGUI::System* >(self);
	wrap_each(_factorymanager->getFalagardMappingIterator());
	return self;
}

static VALUE
rhash_each_pair(VALUE hash, SEL sel)
{
    RETURN_ENUMERATOR(hash, 0, 0);
    rhash_foreach(hash, each_pair_i, 0);
    RETURN_IF_BROKEN();
    return hash;
}

VALUE
rhash_keep_if(VALUE hash, SEL sel)
{
    RETURN_ENUMERATOR(hash, 0, 0);
    rhash_modify(hash);
    rhash_foreach(hash, keep_if_i, hash);
    return hash;
}