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  • Adding LambaExpression to an instance of IQueryable

    - by Paul Knopf
    ParameterExpression parameter = Expression.Parameter(typeof(Product), "x"); MemberExpression Left = Expression.MakeMemberAccess(parameter, typeof(Product).GetProperty("Name")); ConstantExpression Right = Expression.Constant(value, typeof(String)); BinaryExpression expression = Expression.Equal(Left, Right); LambdaExpression lambada = Expression.Lambda<Func<Product, bool>>(expression, parameter); Now how do I add this lambada to an instance of an IQuerybale, lets say _query _query.Where(lambada.Compile());?

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  • O(log n) algorithm for merging lists and computing rank?

    - by Eternal Learner
    Given two sorted lists, each containing n real numbers, is there a O(log?n) time algorithm to compute the element of rank i (where i coresponds to index in increasing order) in the union of the two lists, assuming the elements of the two lists are distinct? I can think of using a Merge procedure to merge the 2 lists and then find the A[i] element in constant time. But the Merge would take O(n) time. How do we solve it in O(log n) time?

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  • windows keydown listeners in C

    - by numerical25
    I am having a very hard time finding resources that talk about the windows message system. Mainly the keydown constant variables. I need to know what const varibles I need to listen for all keypress especially the arrow keys for C

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  • PHP constants declaration based on condition

    - by CM
    I am using one separate file for all constants of my PHP application. class constants { const USERNAME = 'abc'; ........ ........ } For lets say USERNAME constant, value can be either xyz or abc based on file exists check. if xyz file exists USERNAME value would be xyz. How can I do this check in my constants class? Thanks in advance.

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  • can't get pingfm class work (ruby)

    - by Radek
    I have simple code from Ping.fm Ruby Client/Library require 'pingfm' pingfm = Pingfm::Client.new('api_key', 'user_app_key') but it gives me uninitialized constant Pingfm (NameError) pingfm gem is installed, just there was this error message Could not find main page README during installation. Any idea how I can get it work? I am using: ruby 1.8.6 (2008-08-11 patchlevel 287) [i386-mswin32] pingfm (1.0.2)

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  • Ruby parse order

    - by bresc
    Hi, given this code: class Foo def bar return Bar.new end end class Bar ... end I get this error: NameError: uninitialized constant Bar This obviously works if I put Bar before Foo but that is not a real solution though. Any ideas on how to solve this without considering the order? Many thanks.

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  • Could I ever want to access the address zero?

    - by Joel
    The constant 0 is used as the null pointer in C and C++. But as in http://stackoverflow.com/questions/2389251/pointer-to-a-specific-fixed-address there seems to be some possible use of assigning fixed addresses. Is there ever any conceivable need, in any system, for whatever low level task, for accessing the address 0? If there is, how is that solved with 0 being the null pointer and all? If not, what makes it certain that there is not such a need?

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  • which is better in general, map or vector in c++?

    - by tsubasa
    As I know that accessing an element in vector takes constant time while in map takes logarithmic time. However, storing a map takes less memory than storing a vector. Therefore, I want to ask which one is better in general? I'm considering using one of those two in my program, which has about 1000 elements. I plan to use 3 dimensional vector, which would take 1000x1000x1000 elements.

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  • is const (c++) optional?

    - by Dr Deo
    according to some tutorials i read a while back, the "const" declaration makes a variable "constant" ie it cannot change later. But i find this const declaration abit inconveniencing since the compiler sometimes gives errors like "cannot convert const int to int" or something like that. and i find myself cheating by removing it anyway. question: assuming that i am careful about not changing a variable in my source code, can i happily forget about this const stuff? Thanks in advance

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  • Weird constants

    - by Quassnoi
    I've seen these in real code: #define SCREEN_DIMENSIONS 2 #define THREE_THOUSAND_FIVE_HUNDRED_TWENTY_TWO 3522 What is the weirdest constant you've ever seen? P. S. And of course my favorite in JScript: bool b; switch (b.ToString().length) { case 4: // true ... break; case 5: // false ... break; )

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  • How to retrieve values of an enumeration of given string literal

    - by TonyP
    Need to get a value of an enumeration of a given string literal like "xlCenter" (these values are cut and pasted from Excel Macro). I would like to retrieve the actual constant value (int) -4108="xLCenter" via com marshaling is this possible ? if so how ? Ideally I am looking for function like this public int ExcelConstant(string constantName) { ...} Thanks

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  • What does KEYEVENTF_SILENT equate to

    - by Vaccano
    KEYEVENTF_SILENT is a constant used in calls like this one: keybd_event(VK_OFF, 0, KEYEVENTF_SILENT, 0); keybd_event(VK_OFF, 0, KEYEVENTF_SILENT | KEYEVENTF_KEYUP, 0); But since I am using .net I don't know what the actual value of KEYEVENTF_SILENT is. I can't call it with out knowing. Any ideas?

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  • Hello World to Twitter from C#

    - by cf_PhillipSenn
    A few days ago, I posted this question and this question asking about how to post "Hello World" to twitter. I've gotten helpful responses, which have propelled me further along, but I'm still lost. I need to use OAuth because (as I read it) using username and password is going to be deprecated soon. I need an example as simple as updating the status with the string constant 'Hello World!'. My client is specifying that I must use C#.

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  • Routing error in rails

    - by user662503
    In my controller I have def update_project_dates p "It is end date....." @user=User.find(params[:user]) @projects=Project.find_all_by_user_id(@user) end In the view page (only some part of the code is copied and pasted) eventDrop: function() { $.ajax({ url:'/update_project_dates/', success:function(data) { alert("Hello"); } }) }, In my routes.rb I have mentioned match '/update_project_dates' => 'users#update_project_dates', :method=> :get get 'update_project_dates' But When the ajax request goes, I get the routing error as Routing Error uninitialized constant UsersController Where am I doing wrong here...Please help..

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  • Understanding PHP's way of reading if statements

    - by Masi
    How does PHP read if statements? I have the following if statements in this order if ( $number_of_figures_in_email < 6) { -- cut: gives false } if($number_of_emails > 0) { -- cut: gives false } if ( $number_of_emails == 0) { -- cut: gives true } The code behaves randomly. It sometimes goes to the third if clause and gives me a success, while sometimes to the one of the first two if clauses when the input variables are constant. This suggests me that I cannot code only with if statements.

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  • Processing large (over 1 Gig) files in PHP using stream_filter_*

    - by mike
    $fp_src=fopen('file','r'); $filter = stream_filter_prepend($fp_src, 'convert.iconv.ISO-8859-1/UTF-8'); while(fread($fp_src,4096)){ ++$count; if($count%1000==0) print ftell($fp_src)."\n"; } When I run this the script ends up consuming ~ 200 MB of RAM after going through just 35MB of the file. Running it without the stream_filter zips right through with a constant memory footprint of ~10 MB. What gives?

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  • ActionScript Reading Static Const Array

    - by TheDarkIn1978
    how can i evaluate weather my test array is equal to my static constant DEFAULT_ARRAY? shouldn't my output be returning true? public class myClass extends Sprite { private static const DEFAULT_ARRAY:Array = new Array(1, 2, 3); public function myClass() { var test:Array = new Array(1, 2, 3); trace (test == DEFAULT_ARRAY); } //traces false

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  • Ruby on Rails Problem PotionStore

    - by David Schiefer
    Hello, I am trying to install the PotionStore on my Mac OS X 10.6 server with Ruby on Rails 3 installed. Upon launching the server on port 3000 and pointing safari to this address, I get this: NameError in Store/orderController#index uninitialized constant ActiveRecord::ConnectionAdapters::PostgreSQLAdapter::PGconn What does this mean? I'm not too advanced with Ruby on Rails, so this throws me a bit.

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