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define([
        "./core",
        "./var/slice",
        "./callbacks"
], function( jQuery, slice ) {

jQuery.extend({

        Deferred: function( func ) {
                var tuples = [
                                // action, add listener, listener list, final state
                                [ "resolve", "done", jQuery.Callbacks("once memory"), "resolved" ],
                                [ "reject", "fail", jQuery.Callbacks("once memory"), "rejected" ],
                                [ "notify", "progress", jQuery.Callbacks("memory") ]
                        ],
                        state = "pending",
                        promise = {
                                state: function() {
                                        return state;
                                },
                                always: function() {
                                        deferred.done( arguments ).fail( arguments );
                                        return this;
                                },
                                then: function( /* fnDone, fnFail, fnProgress */ ) {
                                        var fns = arguments;
                                        return jQuery.Deferred(function( newDefer ) {
                                                jQuery.each( tuples, function( i, tuple ) {
                                                        var fn = jQuery.isFunction( fns[ i ] ) && fns[ i ];
                                                        // deferred[ done | fail | progress ] for forwarding actions to newDefer
                                                        deferred[ tuple[1] ](function() {
                                                                var returned = fn && fn.apply( this, arguments );
                                                                if ( returned && jQuery.isFunction( returned.promise ) ) {
                                                                        returned.promise()
                                                                                .done( newDefer.resolve )
                                                                                .fail( newDefer.reject )
                                                                                .progress( newDefer.notify );
                                                                } else {
                                                                        newDefer[ tuple[ 0 ] + "With" ]( this === promise ? newDefer.promise() : this, fn ? [ returned ] : arguments );
                                                                }
                                                        });
                                                });
                                                fns = null;
                                        }).promise();
                                },
                                // Get a promise for this deferred
                                // If obj is provided, the promise aspect is added to the object
                                promise: function( obj ) {
                                        return obj != null ? jQuery.extend( obj, promise ) : promise;
                                }
                        },
                        deferred = {};

                // Keep pipe for back-compat
                promise.pipe = promise.then;

                // Add list-specific methods
                jQuery.each( tuples, function( i, tuple ) {
                        var list = tuple[ 2 ],
                                stateString = tuple[ 3 ];

                        // promise[ done | fail | progress ] = list.add
                        promise[ tuple[1] ] = list.add;

                        // Handle state
                        if ( stateString ) {
                                list.add(function() {
                                        // state = [ resolved | rejected ]
                                        state = stateString;

                                // [ reject_list | resolve_list ].disable; progress_list.lock
                                }, tuples[ i ^ 1 ][ 2 ].disable, tuples[ 2 ][ 2 ].lock );
                        }

                        // deferred[ resolve | reject | notify ]
                        deferred[ tuple[0] ] = function() {
                                deferred[ tuple[0] + "With" ]( this === deferred ? promise : this, arguments );
                                return this;
                        };
                        deferred[ tuple[0] + "With" ] = list.fireWith;
                });

                // Make the deferred a promise
                promise.promise( deferred );

                // Call given func if any
                if ( func ) {
                        func.call( deferred, deferred );
                }

                // All done!
                return deferred;
        },

        // Deferred helper
        when: function( subordinate /* , ..., subordinateN */ ) {
                var i = 0,
                        resolveValues = slice.call( arguments ),
                        length = resolveValues.length,

                        // the count of uncompleted subordinates
                        remaining = length !== 1 || ( subordinate && jQuery.isFunction( subordinate.promise ) ) ? length : 0,

                        // the master Deferred. If resolveValues consist of only a single Deferred, just use that.
                        deferred = remaining === 1 ? subordinate : jQuery.Deferred(),

                        // Update function for both resolve and progress values
                        updateFunc = function( i, contexts, values ) {
                                return function( value ) {
                                        contexts[ i ] = this;
                                        values[ i ] = arguments.length > 1 ? slice.call( arguments ) : value;
                                        if ( values === progressValues ) {
                                                deferred.notifyWith( contexts, values );
                                        } else if ( !( --remaining ) ) {
                                                deferred.resolveWith( contexts, values );
                                        }
                                };
                        },

                        progressValues, progressContexts, resolveContexts;

                // Add listeners to Deferred subordinates; treat others as resolved
                if ( length > 1 ) {
                        progressValues = new Array( length );
                        progressContexts = new Array( length );
                        resolveContexts = new Array( length );
                        for ( ; i < length; i++ ) {
                                if ( resolveValues[ i ] && jQuery.isFunction( resolveValues[ i ].promise ) ) {
                                        resolveValues[ i ].promise()
                                                .done( updateFunc( i, resolveContexts, resolveValues ) )
                                                .fail( deferred.reject )
                                                .progress( updateFunc( i, progressContexts, progressValues ) );
                                } else {
                                        --remaining;
                                }
                        }
                }

                // If we're not waiting on anything, resolve the master
                if ( !remaining ) {
                        deferred.resolveWith( resolveContexts, resolveValues );
                }

                return deferred.promise();
        }
});

return jQuery;
});