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• Common practice for higher-order-polymorphism in scala

  - by raichoo

  Hi, I'm trying to grasp higher-order-polymophism in scala by implementing a very basic interface that describes a monad but I come across a problem that I don't really understand. I implemented the same with C++ and the code looks like this: #include <iostream> template <typename T> class Value { private: T value; public: Value(const T& t) { this->value = t; } T get() { return this->value; } }; template < template <typename> class Container > class Monad { public: template <typename A> Container<A> pure(const A& a); }; template <template <typename> class Container> template <typename A> Container<A> Monad<Container>::pure(const A& a) { return Container<A>(a); } int main() { Monad<Value> m; std::cout << m.pure(1).get() << std::endl; return 0; } When trying to do the same with scala I fail: class Value[T](val value: T) class Monad[Container[T]] { def pure[A](a: A): Container[A] = Container[A](a) } object Main { def main(args: Array[String]): Unit = { val m = new Monad[Value] m.pure(1) } } The compiler complains about: [raichoo@lain:Scala]:434> scalac highorder.scala highorder.scala:5: error: not found: value Container Container[A](a) ^ one error found What am I doing wrong here? There seems to be a fundamental concept I don't seem to understand about scala typeconstructors. Regards, raichoo

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• What is the best way to handle this type of inclusive logic in Ruby?

  - by Steve McLelland

  Is there a better way of handling this in Ruby, while continuing to use the symbols? pos = :pos1 # can be :pos2, :pos3, etc. if pos == :pos1 || pos == :pos2 || pos == :pos3 puts 'a' end if pos == :pos1 || pos == :pos2 puts 'b' end if pos == :pos1 puts 'c' end The obvious way would be swapping out the symbols for number constants, but that's not an option. pos = 3 if pos >= 1 puts 'a' end if pos >= 2 puts 'b' end if pos >= 3 puts 'c' end Thanks.

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• Empty accessors do matter? Regarding value types and their modification

  - by Petr

  Hi, I have following code that does not work due to "a" being a value typed. But I thought it would not work even without accessors, but it did: class Program { a _a //with accessors it WONT compile { get; set; } static void Main(string[] args) { Program p = new Program(); p._a.X = 5; //when both accessors are deleted, compiler does not //complain about _a.X not being as variable } } struct a { public int X; } It does not work as "a" is struct. But when I delete accessors from "_a" instance, it works. I do not understand why. Thanks

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• How to sort a gridview once a radio button is selected

  - by metashockwave

  I'm trying to sort records in the gridview right after a radio button is selected. My approach is with the dataview, but because the dataset variable doesn't survive a round trip to the server, I don't know how to make this happen. please help! Public Sub GetCustomers() db.RunProcedure("usp_customers_get_all") db.doSort(radList.SelectedValue) gvCustomers.DataSource = db.MyView End Sub Protected Sub radList_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles radList.SelectedIndexChanged If radList.SelectedValue = 0 Then db.doSort(0) gvCustomers.DataSource = db.MyView End If If radList.SelectedValue = 1 Then db.doSort(1) gvCustomers.DataSource = db.MyView End If End Sub Public Sub doSort(ByVal strIn As Integer) If strIn = 0 Then MyView.Sort = "lastname, firstname" Else MyView.Sort = "username" End If End Sub Public Sub RunProcedure(ByVal strName As String) Dim objConnection As New SqlConnection(mstrConnection) Dim mdbDataAdapter As New SqlDataAdapter(strName, objConnection) Try mdbDataAdapter.SelectCommand.CommandType = CommandType.StoredProcedure Me.mDataset.Clear() mdbDataAdapter.Fill(mDataset, "tblCustomers") MyView.Table = mDataset.Tables("tblCustomers") Catch ex As Exception Throw New Exception("stored procedure is " & strName.ToString & " error is " & ex.Message) End Try End Sub

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• Does MS Test provide a default value equals comparison?

  - by fearofawhackplanet

  I want to test for example int orderId = myRepository.SubmitOrder(orderA); orderB = myRepository.GetOrder(orderId); Assert.AreEqual(orderA, orderB); // fail Obviously I need a value comparison here, but I don't want to have to provide an overridden Equals implementation for all of my classes purely for the sake of testing (it wouldn't be of any use in the rest of the app). Is there a provided generic method that just checks every field using reflection? Or if not, it is possible to write my own?

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• invoking proc with instance_eval with arguments

  - by dorelal

  I know this works proc = Proc.new do puts self.hi + ' world' end class Usa def hi "Hello!" end end Usa.new.instance_eval &proc However I want to pass arguments to proc. So I tried this which does not work. Can anyone help me make following work. proc = Proc.new do |greeting| puts self.hi + gretting end class Usa def hi "Hello!" end end Usa.new.instance_eval &proc, 'world' # does not work Usa.new.instance_eval &proc('world') # does not work

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• statemachine, conditional transitions

  - by astropanic

  I'm currently using Workflow. class Link < ActiveRecord::Base include Workflow workflow do state :new do event :process, :transitions_to => :checking #checking http_response_code & content_type end state :checking do event :process, :transitions_to => :fetching_links # fetching all links end state :fetching_links do event :process, :transitions_to => :checking #ready for next check end end end Now, I can do: l = Link.new l.process! l.process! l.process! l.process! # n times l.process! (in a loop, or cron job for example) But it can happens, some link will not respond or give me an invalid response durning the checking process. How I can conditionally switch to another state ? I mean something like this: class Link < ActiveRecord::Base include Workflow workflow do state :new do event :process, :transitions_to => :checking #checking http_response_code & content_type end state :checking do event :process, :transitions_to => :fetching_links # if all is fine event :process, :transitions_to => :failded # if something goes wrong end state :fetching_links do event :process, :transitions_to => :checking #ready for next check end end end

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• ruby restrict attr_accessor in subclass

  - by Arivarasan

  I want restrict the access of superclass's method in subclass class Parent attr_accessor :first_name, :last_name def initialize(first_name, last_name) @first_name, @last_name = first_name, last_name end def full_name @first_name + " " + @last_name end end class Son < Parent attr_accessor :first_name def initialize(parent, first_name) @first_name = first_name @last_name = parent.last_name end def full_name @first_name + " " + @last_name end end p = Parent.new("Bharat", "Chipli") puts p.full_name s = Son.new(p, "Harry") s.last_name= "Smith" puts s.full_name here i am getting son's full name as "Harry Smith", but i want "Harry Chipli"

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• How do I find hash value of a 3D vector ?

  - by brainydexter

  I am trying to perform broad-phase collision detection with a fixed-grid size approach. Thus, for each entity's position: (x,y,z) (each of type float), I need to find which cell does the entity lie in. I then intend to store all the cells in a hash-table and then iterate through to report (if any) collisions. So, here is what I am doing: Grid-cell's position: (int type) (Gx, Gy, Gz) = (x / M, y / M, z / M) where M is the size of the grid. Once, I have a cell, I'd like to add it to a hash-table with its key being a unique hash based on (Gx, Gy, Gz) and the value being the cell itself. Now, I cannot think of a good hash function and I need some help with that. Can someone please suggest me a good hash function? Thanks

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• Javascript: Error 'Object Required.'

  - by javascripthelp

  The following is the error popup message I get when I click "Finalize" button on my website: "Line: 298 Char: 5 Error: Object required: 'lobi_c_selected(...)' Code: 0 URL: http://10.128.23.50/i-prostage/AP/w_ap_check_reconciliation.asp?" Normally, when I click "Finalize" button, it'll generate and show a report in a popup window. However, I'd get this error message instead. Can any of you help me locate the error in the following source code for the page that I'm running in IE 6? sub cb_finalize dim ll_loop, ll_found, lobj_c_selected of_SetHourGlass(True) rpt_link.innerHTML = "" rpt_link.href = "" 'Process only if at least one record was selected if rds1.Recordset.Recordcount 0 then lb_found = false if rds1.Recordset.Recordcount = 1 then if c_selected.checked then lb_found = true else Set lobj_c_selected = document.all.item("c_selected") for ll_loop = 1 to rds1.Recordset.Recordcount if lobj_c_selected(ll_loop - 1).checked then lb_found = true exit for end if next end if if not lb_found then msgbox "Please select a record to be posted.", vbInformation, "ProStage Accounting" of_SetHourGlass(False) else window.setTimeout "ue_process()", 100, vbscript 'Post Event end if else msgbox "There's no record to be posted." + vbcrlf + "Please select a record to be posted.", vbInformation, "ProStage Accounting" of_SetHourGlass(False) end if end sub Sub ue_process dim ll_loop, ll_count, ls_ret, ls_trxid, ls_r1 'Get only selected records redim ls_trxid(rds1.Recordset.Recordcount) for ll_loop = 1 to rds1.Recordset.Recordcount rds1.Recordset.AbsolutePosition = ll_loop if not isnull(rds1.Recordset("clrdt")) then 'Add to TRXID array if selected ll_count = ll_count + 1 ls_trxid(ll_count) = rds1.Recordset("trxid") end if next 'Process reconciliation rds1.Recordset.MarshalOptions = 1 ls_ret = iBO_Update.of_update_1(is_dbsrc, rds1.Recordset, "GLTRX", is_sql) if ls_ret < "1" then msgbox "Update Failed ! " + ls_ret, vbExclamation + vbOKonly, document.title of_SetHourGlass(False) else 'Display Posting Journal & clear screen ue_posting_journal ls_trxid, ll_count Set rds1.SourceRecordset = iBO_Company.of_validate(is_dbsrc, "SELECT 1 FROM DUAL WHERE 1 = 2") ib_query = false 'Not to process RetrieveEnd end if End Sub Sub ue_posting_journal(as_trxid, al_count) dim ll_argseq, ls_argtyp, ls_argmnt, ll_sargseq of_setreport() ' Start service 'Prepare arguments for report in RPTMSTR table for ll_loop = 1 to al_count + 1 select case ll_loop case 1 'Range displayed as report title ll_argseq = 800 ls_argtyp = null ls_argmnt = "st_title.text = 'Bank: " + bnkid_name.value + ", As of Date: " + _ of_date_stringtodate(id_trxdt) + "'" ll_sargseq = 0 case else 'TRXID array ll_argseq = 1 ll_sargseq = ll_loop - 1 ls_argtyp = "S" ls_argmnt = as_trxid(ll_loop - 1) end select of_report_register_array "d_rpt_ap_check_reconciliation_register", ll_argseq, ls_argtyp, ls_argmnt, ll_sargseq next of_report_process "d_rpt_ap_check_reconciliation_register", true, true 'Display report of_sethourglass(False) End Sub

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• How do you update the aspnetdb membership IsApproved value?

  - by Matt

  I need to update existing users IsApproved status in the aspnet_Membership table. I have the code below that does not seem to be working. The user.IsApproved property is updated but it is not saving it to the database table. Are there any additional calls I need to make? Any suggestions? Thanks. /// <summary> /// Updates a users approval status to the specified value /// </summary> /// <param name="userName">The user to update</param> /// <param name="isApproved">The updated approval status</param> public static void UpdateApprovalStatus(string userName, bool isApproved) { MembershipUser user = Membership.GetUser(userName); if (user != null) user.IsApproved = isApproved; }

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• Crystal report sql expression field

  - by Domnic

  im using asp.net crystal report and this is sql query CONVERT(NUMERIC(8, 2), CASE WHEN CASE WHEN GLDD_DOC_AMOUNT 0 THEN GLDD_DOC_AMOUNT ELSE 0 END = 0 THEN NULL ELSE CASE WHEN GLDD_DOC_AMOUNT 0 THEN GLDD_DOC_AMOUNT ELSE 0 END END) Q3_DR, CONVERT(NUMERIC(8, 2), CASE WHEN (- 1 * CASE WHEN GLDD_DOC_AMOUNT < 0 THEN GLDD_DOC_AMOUNT ELSE 0 END) = 0 THEN NULL ELSE - 1 * CASE WHEN GLDD_DOC_AMOUNT < 0 THEN GLDD_DOC_AMOUNT ELSE 0 END END) Q3_CR, i want to write this query into crystal report sql expression field how can i convert this?

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• Regex to add CDATA for mal formed XML

  - by AntonioCS

  Hey guys! I have this huge xml file (13 mb) and it has some malformed values. Here is a sample of the xml: <propertylist> <adprop index="0" proptype="type" value="Ft"/> <adprop index="0" proptype="category" value="Bs"/> <adprop index="0" proptype="subcategory" value="Bsm"/> <adprop index="0" proptype="description" value="MOONEN CUSTOM 58"/> </propertylist> Now this is ok. But I many other nodes that are not encapsulated in CDATA that need to be. The node that gives me problems is the <adprop index="0" proptype="description" value=""/> I created this regular expression: <adprop index="0" proptype="description" value="(.+)"\/> to catch that node and replace it with this: <adprop index="0" proptype="description" value="<![CDATA[\1]]>"\/> I run this in notepad++ and it works. The only problem is when the value="" is multi lined like: <adprop index="0" proptype="description" value="cutter that has demonstrated her offshore capabiliti from there to the Canaries with her current owner. Spacious homely interior with over 2m headroom and heaps of" /> It fails with this one, and there are plenty like this one. Can anyone help me out in the regular expression so that I can catch the value when it's multi lined? Thanks

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• How to change the value of None in Python?

  - by michael

  I'm currently reading chapter 5.8 of Dive Into Python and Mark Pilgrim says: There are no constants in Python. Everything can be changed if you try hard enough. This fits with one of the core principles of Python: bad behavior should be discouraged but not banned. If you really want to change the value of None, you can do it, but don't come running to me when your code is impossible to debug. I tried this in the interpreter None = "bad" I get a SyntaxError: assignment to None Just out of curiosity how do you change None?

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• cant access nested ressource 'comments' in rails 3.0.1

  - by DannyRe

  Hey, I hope you can help me. /config/routes.rb resources :deadlines do resources :comments end /model/comment.rb class Comment < ActiveRecord::Base belongs_to :post, :class_name = "Post", :foreign_key = "post_id" end /model/post.rb class Post < ActiveRecord::Base has_many :comments end When I want to visit: http://localhost:3000/posts/1/comments/new it says: undefined method `comments_path' for #<#:0x4887138 in _form.html I use 'formtastic' and the _form.html.erb looks like this: <% semantic_form_for [@comment] do |form| % <% form.inputs do % <%= form.input :content % <% end % <% form.buttons do % <%= form.commit_button % <% end % <% end %

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• filling in the holes in the result of a query

  - by ????? ????????

  my query is returning: +------+------+------+------+------+------+------+-------+------+------+------+------+-----+ | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Bla | +------+------+------+------+------+------+------+-------+------+------+------+------+-----+ | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 13 | | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 14 | | 0 | 0 | 0 | 0 | 0 | 9 | 0 | 0 | 0 | 0 | 8 | 37 | 29 | | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 374 | 30 | | 0 | 0 | 1 | 0 | 78 | 2 | 4 | 8 | 57 | 169 | 116 | 602 | 31 | | 156 | 255 | 79 | 75 | 684 | 325 | 289 | 194 | 407 | 171 | 584 | 443 | 32 | | 1561 | 2852 | 2056 | 796 | 2004 | 1755 | 879 | 1052 | 1490 | 1683 | 2532 | 2381 | 33 | | 4167 | 3841 | 4798 | 3399 | 4132 | 5849 | 3157 | 4381 | 4424 | 4487 | 4178 | 5343 | 34 | | 5472 | 5939 | 5768 | 4150 | 7483 | 6836 | 6346 | 6288 | 6850 | 7155 | 5706 | 5231 | 35 | | 5749 | 4741 | 5264 | 4045 | 6544 | 7405 | 7524 | 6625 | 6344 | 5508 | 6513 | 3854 | 36 | | 5464 | 6323 | 7074 | 4861 | 7244 | 6768 | 6632 | 7389 | 8077 | 8745 | 6738 | 5039 | 37 | | 5731 | 7205 | 7476 | 5734 | 9103 | 9244 | 7339 | 8970 | 9726 | 9089 | 6328 | 5512 | 38 | | 7262 | 6149 | 8231 | 6654 | 9886 | 9834 | 9306 | 10065 | 9983 | 9984 | 6738 | 5806 | 39 | | 5886 | 6934 | 7137 | 6978 | 9034 | 9155 | 7389 | 9437 | 9711 | 8665 | 6593 | 5337 | 40 | +------+------+------+------+------+------+------+-------+------+------+------+------+-----+ as you can see the BLA column starts from 13. i want it to start from 1, then 2, then 3 etc......I do not want any gaps in the data. The reason there are gaps is because all of the months are 0 for that specific bla how do i get the result set to include ALL values for BLA, even ones that will yield 0 for the months? here are the desired results: +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+ | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Bla | +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+ | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4 | | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 5 | | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6 | | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7 | | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8 | | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 9 | | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 10 | | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 11 | | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 12 | | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 13 | | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 14 | | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 15 | | … | … | … | … | … | … | … | … | … | … | … | … | … | +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+ here's my query: WITH CTE AS ( select sum(case when datepart(month,[datetime entered]) = 1 then 1 end) as Jan, sum(case when datepart(month,[datetime entered]) = 2 then 1 end) as Feb, sum(case when datepart(month,[datetime entered]) = 3 then 1 end) as Mar, sum(case when datepart(month,[datetime entered]) = 4 then 1 end) as Apr, sum(case when datepart(month,[datetime entered]) = 5 then 1 end) as May, sum(case when datepart(month,[datetime entered]) = 6 then 1 end) as Jun, sum(case when datepart(month,[datetime entered]) = 7 then 1 end) as Jul, sum(case when datepart(month,[datetime entered]) = 8 then 1 end) as Aug, sum(case when datepart(month,[datetime entered]) = 9 then 1 end) as Sep, sum(case when datepart(month,[datetime entered]) = 10 then 1 end) as Oct, sum(case when datepart(month,[datetime entered]) = 11 then 1 end) as Nov, sum(case when datepart(month,[datetime entered]) = 12 then 1 end) as Dec, DATEPART(yyyy,[datetime entered]) as [Year], bla= CASE WHEN datediff(d, CAST([datetime entered] as DATE), CAST([datetime completed] as DATE))*24 + CONVERT(CHAR(2),[datetime completed],108) >191 THEN 192 ELSE datediff(d, CAST([datetime entered] as DATE), CAST([datetime completed] as DATE))*24 + CONVERT(CHAR(2),[datetime completed],108) END --,datediff(d, CAST([datetime entered] as DATE), CAST([datetime completed] as DATE)) AS Sort_Days, --DATEPART(hour, [datetime completed] ) AS Sort_Hours from [TurnAround] group by datediff(d, CAST([datetime entered] as DATE), CAST([datetime completed] as DATE))*24 + CONVERT(CHAR(2),[datetime completed],108), DATEPART(yyyy,[datetime entered]) , [datetime entered] --[DateTime Completed] ) SELECT ISNULL(SUM(Jan),0) Jan, ISNULL(SUM(Feb),0) Feb, ISNULL(SUM(Mar),0) Mar, ISNULL(SUM(Apr),0) Apr, ISNULL(SUM(May),0) May, ISNULL(SUM(Jun),0) Jun, ISNULL(SUM(Jul),0) Jul, ISNULL(SUM(Aug),0) Aug, ISNULL(SUM(Sep),0) Sep, ISNULL(SUM(Oct),0) Oct, ISNULL(SUM(Nov),0) Nov, ISNULL(SUM(Dec),0) Dec, [year], --,Sort_Hours, --Sort_Days, A.RN Bla FROM ( SELECT *, RN=ROW_NUMBER() OVER(ORDER BY object_id) FROM sys.all_objects) A LEFT JOIN CTE B ON A.RN = CASE WHEN B.Bla > 191 THEN 192 ELSE B.Bla END WHERE A.RN BETWEEN 1 AND 192 GROUP BY A.RN,[year]

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• randomize array using php

  - by Suneth Kalhara

  I need to rendomise the order of follow array using PHP, i tried to use array shuffle and array_random but no luck, can anyone help me please Array ( [0] => Array ( [value] => 4 [label] => GasGas ) [1] => Array ( [value] => 3 [label] => Airoh Helmets ) [2] => Array ( [value] => 12 [label] => XCiting Trials Wear ) [3] => Array ( [value] => 11 [label] => Hebo Trials ) [4] => Array ( [value] => 10 [label] => Jitsie Products ) [5] => Array ( [value] => 9 [label] => Diadora Boots ) [6] => Array ( [value] => 8 [label] => S3 Performance ) [7] => Array ( [value] => 7 [label] => Scorpa ) [8] => Array ( [value] => 6 [label] => Inspired ) [9] => Array ( [value] => 5 [label] => Oset ) )

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• XMPP4R Callbacks dont seem to work

  - by Sid

  Im using xmpp4r and trying to get the hang of a basic chat feature that I wish to implement later in my Rails app. My fundamentals on Ruby Threads is still a bit shaky so I would appreciate any help on this. Though I register the callback i dont get a response from my gmail account. I am able to send a message but my ruby program terminates. In order to prevent it from terminating I tried to stop on of the threads in the program but I cant seem to get it working. require 'rubygems' require "xmpp4r/client" require "xmpp4r/roster" include Jabber def connect client = Client.new(JID::new("[email protected]")) client.connect client.auth("test") client.send(Presence.new.set_type(:available)) client end def create_message(message, to_email) msg = Jabber::Message::new(to_email, message) msg.type = :chat msg end def subscribe(email_id) pres = Presence.new.set_type(:subscribe).set_to(email_id) pres end client = connect roster = Roster::Helper.new(client) roster.add_subscription_request_callback do |item,pres| roster.accept_subscription(pres.from) end def create_callback(client) $t4= Thread.new do client.add_message_callback do |m| puts m.body puts "................................Callback working" end end end puts "Client has connected" msg = create_message("Welcome to the winter of my discontent", "[email protected]") client.send(msg) create_callback(client) def check(client) $t3 = Thread.new do loop do puts "t3 still running........." Thread.current.stop $t4.join end end end check(client)

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• In Ruby, how to implement 20 - point and point - 20 using coerce() ?

  - by Jian Lin

  In Ruby, the operation of point - 20 20 - point are to be implemented. But the following code: class Point attr_accessor :x, :y def initialize(x,y) @x, @y = x, y end def -(q) if (q.is_a? Fixnum) return Point.new(@x - q, @y - q) end Point.new(@x - q.x, @y - q.y) end def -@ Point.new(-@x, -@y) end def *(c) Point.new(@x * c, @y * c) end def coerce(something) [self, something] end end p = Point.new(100,100) q = Point.new(80,80) p (-p) p p - q p q - p p p * 3 p 5 * p p p - 30 p 30 - p Output: #<Point:0x2424e54 @x=-100, @y=-100> #<Point:0x2424dc8 @x=20, @y=20> #<Point:0x2424d3c @x=-20, @y=-20> #<Point:0x2424cc4 @x=300, @y=300> #<Point:0x2424c38 @x=500, @y=500> #<Point:0x2424bc0 @x=70, @y=70> #<Point:0x2424b20 @x=70, @y=70> 30 - p will actually be taken as p - 30 by the coerce function. Can it be made to work? I am actually surprise that the - method won't coerce the argument this way: class Fixnum def -(something) if (/* something is unknown class */) a, b = something.coerce(self) return -(a - b) # because we are doing a - b but we wanted b - a, so it is negated end end end that is, the function returns a negated version of a - b instead of just returning a - b.

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• XSLT - make xsl:analyze-string return string instead of sequence of strings?

  - by tohuwawohu

  Is it possible to make xsl:analyze-string return one string instead of a sequence of strings? Background: I'd like to use xsl:analyze-string in a xsl:function that should encapsulate the pattern matching. Ideally, the function should return an xs:string to be used as sort criteria in an xsl:sort element. At the moment, i have to apply string-join() on every result of the function call since xsl:analyze-string returns a sequence of strings, and xsl:sort doesn't accept such a sequence as sort criteria. See line 24 of the stylesheet: <?xml version="1.0" encoding="UTF-8"?> <xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:my="www.my-personal-namespa.ce" xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xsl:output indent="yes" method="xml" /> <xsl:function name="my:sortierung" > <xsl:param name="inputstring" as="xs:string"/> <xsl:analyze-string select="$inputstring" regex="[0-9]+"> <xsl:matching-substring> <xsl:value-of select="format-number(number(.), '00000')" /> </xsl:matching-substring> <xsl:non-matching-substring> <xsl:value-of select="." /> </xsl:non-matching-substring> </xsl:analyze-string> </xsl:function> <xsl:template match="/input"> <result> <xsl:apply-templates select="value" > <xsl:sort select="string-join((my:sortierung(.)), ' ')" /> </xsl:apply-templates> </result> </xsl:template> <xsl:template match="value"> <xsl:copy-of select="." /> </xsl:template> </xsl:stylesheet> with this input: <?xml version="1.0" encoding="UTF-8"?> <input> <value>A 1 b 120</value> <value>A 1 b 1</value> <value>A 1 b 2</value> <value>A 1 b 1a</value> </input> In my example, is there a way to modify the xsl:function to return a xs:string instead of a sequence?

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• Umlaute from JSP-page are misinterpreted

  - by Karin

  I'm getting Input from a JSP page, that can contain Umlaute. (e.g. Ä,Ö,Ü,ä,ö,ü,ß). Whenever an Umlaut is entered in the Input field an incorrect value gets passed on. e.g. If an "ä" (UTF-8:U+00E4) gets entered in the input field, the String that is extracted from the argument is "ä" (UTF-8: U+00C3 and U+00A4) It seems to me as if the UTF-8 hex encoding (which is c3 a4 for an "ä") gets used for the conversion. How can I retrieved the correct value? Here are snippets from the current implementation The JSP-page passes the input value "pk" on to the processing logic: <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> ... <input type="text" name="<%=pk.toString()%>" value="<%=value%>" size="70"/> <button type="submit" title="Edit" value='Save' onclick="action.value='doSave';pk.value='<%=pk.toString()%>'"><img src="icons/run.png"/>Save</button> The value gets retrieved from args and converted to a string: UUID pk = UUID.fromString(args.get("pk")); //$NON-NLS-1$ String value = args.get(pk.toString()); Note: Umlaute that are saved in the Database get displayed correctly on the page.

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• J2ME TextField Exception

  - by Bob

  When I instantiate a textField, I have a number in it that I want to be the default text. The problem is, I can't seem to be able to place that value into the textfield without getting an error. The strange thing about it is that the same TextField is what I use to set the value of the variable containing the number. TextField myTF = new TextField("Number", value, 10, TextField.NUMERIC); When I run this code, I receive an exception stating that value doesn't match the constraints of TextField.NUMERIC. However, when I check the vale of the value of the variable, I get the following output: value = 1234567890 value.length() = 10 The value is set by the same TextField, saved to the phone that I am working on, and when loaded from the phone's settings, throws an exception.

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• How do I add values from two seperate querys in SQL

  - by fishhead

  Below is my attempt at addinf two values from seperate select statments...it's not working...I can't see why. Looking for some direction thanks select (v1.Value + v2.Value) as total from ( (Select Max(Value) as [Value] from History WHERE Datetime>='Apr 11 2010 6:05AM' and Datetime<='Apr 11 2010 6:05PM' and Tagname ='RWQ272017DTD' ) as v1 (Select Max(Value) as [Value] from History WHERE Datetime>='Apr 11 2010 6:05AM' and Datetime<='Apr 11 2010 6:05PM' and Tagname ='RU282001DTD' ) as v2 ) boy do I feel foolish...I asked the same question a few days ago...now I can't delete this.

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• Cancel Key press event

  - by Asim Sajjad

  How can I return the key, mean if I want to allow only interger value in the textbox , how can I don't allow user to not enter value other then integer, regarding, keypress event, I know there are other ways such as expression to match the string value, but I want to not assign invalid value to the textbox. if (( value 0 a&&(value <=9)) then assigned else return thanks in advance

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• In Delphi 7, why can I assign a value to a const?

  - by Blorgbeard

  I copied some Delphi code from one project to another, and found that it doesn't compile in the new project, though it did in the old one. The code looks something like this: procedure TForm1.CalculateGP(..) const Price : money = 0; begin ... Price := 1.0; ... end; So in the new project, Delphi complains that "left side cannot be assigned to" - understandable! But this code compiles in the old project. So my question is, why? Is there a compiler switch to allow consts to be reassigned? How does that even work? I thought consts were replaced by their values at compile time?

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