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• Writing lambda functions in Scala

  - by user2433237

  I'm aware that you can write anonymous functions in Scala but I'm having trouble trying to convert a piece of code from Scheme. Could anyone help me convert this to Scala? (define apply-env (lambda (env search-sym) (cases environment env (empty-env () (eopl:error 'apply-env "No binding for ~s" search-sym)) (extend-env (var val saved-env) (if (eqv? search-sym var) val (apply-env saved-env search-sym))) (extend-env-rec (p-name b-var p-body saved-env) (if (eqv? search-sym p-name) (proc-val (procedure b-var p-body env)) (apply-env saved-env search-sym)))))) Thanks in advance

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• Wordpress php: Way to test if pages are children of a parent page?

  - by Erykan

  Hi - Working on my first Wordpress site so I'm sure this is a really basic question. I'm struggling to write a conditional php statement that performs a certain action when a page is a child of a parent page. For example, rather than just specifying one page, as below, I'd like to specify all pages that have the 'About Us' page as a parent: <?php if (is_page('About Us')) echo 'Hello World!'; ?> I've tried the "child_of" function but it wasn't as straightforward as I'd hoped. When I use the below, I get a syntax error - probably just me not knowing how to use the function: <?php if (child_of('About Us')) echo 'Hello World!'; ?> Any suggestions? Thanks!!

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• Copying a file with PHP Command

  - by Tom

  Hi, I'm having a problem using the copy function in PHP, what is wrong with it? I get the error; Parse error: syntax error, unexpected T_VARIABLE On the bottom line; $targetDir = 'file.txt'; $targetDir2 = 'file2.txt'; copy($targetDir, $targetDir2); Thanks The entire file is; <?PHP $targetDir = 'file.txt'; $targetDir2 = 'file2.txt'; copy($targetDir, $targetDir2); ?> copy and pasted from the doc.

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• Generic SQL builder .NET

  - by Patrick

  I'm looking for a way to write an SQL statement in C# targeting different providers. A typical example of SQL statements differentiating is the LIMIT in PostgreSQL vs. TOP in MSSQL. Is the only way to solve SQL-syntax like the two above to write if-statements depending on which provider the user selects or using try catch statements as flow control (LIMIT didn't work, I'll try TOP instead)? I've seen the LINQ Take method, but I'm wondering if one can do this without LINQ? In other words, does C# have some generic SQL Provider class that I have failed to find that can be used?

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• Problem with "not declared in this scope" error

  - by lego69

  I've got: error a1 was not declared in this scope Can somebody please explain why this code causes that? quiz.h #ifndef QUIZ_H_ #define QUIZ_H_ #include "quiz.cpp" class A { private: int player; public: A(int initPlayer); ~A(); void foo(); }; #endif /* QUIZ_H_ */ quiz.cpp #include "quiz.h" #include <iostream> using std::cout; using std::endl; A::A(int initPlayer = 0){ player = initPlayer; } A::~A(){ } void A::foo(){ cout << player; } main function #include "quiz.h" int main() { quiz(7); return 0; } quiz function #include "quiz.h" void quiz(int i) { A a1(i); a1.foo(); }

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• Looking for a way to highlight specific words in textareas?

  - by Dan

  Hi i'm looking for a way to highlight specific words in text kind of like how a text editor might work with syntax highlighting. The highlighting will consist of the text being different colours and/or different styles such as italic, bold or regular. In order to narrow focus, how this might be achieved using Java Swing components. There are most probably a number of ways of doing this but one that is efficient in dealing with multiple highlighted words and large amounts of text. Any feedback is appreciated. Thanks.

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• Make SQL query more efficient

  - by Webnet

  I currently have this query which runs 2 of the exact same sub queries but pull different data. When I make the values comma separated it throws an SQL error saying the sub query can return only one value. Is there anything else I can do to avoid running multiple sub queries? SELECT product_id, ( SELECT COUNT(listing_id) FROM ebay_archive_product_listing_assoc WHERE product_id = product_master.product_id) as listing_count, sku, type_id, ( SELECT AVG(ebay_archive_listing.current_price), AVG(ebay_archive_listing.buy_it_now_price) FROM ebay_archive_listing WHERE id IN ( SELECT listing_id FROM ebay_archive_product_listing_assoc WHERE product_id = product_master.product_id ) AND ebay_archive_listing.start_time >= '.$startTimestamp.' AND ebay_archive_listing.start_time <= '.$endTimestamp.' AND ebay_archive_listing.current_price > 0 ) as average_bid_price, ( SELECT FROM ebay_archive_listing WHERE id IN ( SELECT listing_id FROM ebay_archive_product_listing_assoc WHERE product_id = product_master.product_id ) AND ebay_archive_listing.start_time >= '.$startTimestamp.' AND ebay_archive_listing.start_time <= '.$endTimestamp.' AND ebay_archive_listing.buy_it_now_price > 0 ) as average_buyout_price FROM product_master I'm aware of the syntax error... I'm selecting 2 seperate averages and am wondering if I can do it any simpler way.

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• Cannot create an array of LinkedLists in Java...?

  - by kchau

  I'm working on a sparse matrix class that needs to use an array of LinkedLists to store the values of a matrix. Each element of the array (i.e. each LinkedList) represents a row of the matrix. And, each element in the LinkedLists represents a column and the stored value. In my class, I have a declaration of the array as: private LinkedList<IntegerNode>[] myMatrix; And, in my constructor for the SparseMatrix, I try to define: myMatrix = new LinkedList<IntegerNode>[numRows]; The error I end up getting is "Cannot create a generic array of LinkedList<IntegerNode>." So, I have two issues with this, 1) What am I doing wrong, and 2) Why is the type acceptable in the declaration for the array if it can't be created? Edit: IntegerNode is a class that I have created. And, all of my class files are packaged together.

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• Add the categories selector widget to the PAGE editor with predefined categories listed?

  - by Scott B

  The following code will add the categories selector widget to the WordPress Page editor interface... add_action('admin_menu', 'my_post_categories_meta_box'); function my_post_categories_meta_box() { add_meta_box('categorydiv', __('Categories'), 'post_categories_meta_box', 'page', 'side', 'core'); } What I would like to do is to figure out how to modify the resulting category listing so that it only contains a predefined list of hard coded categories that I define. Since I'm adding this via my custom theme, it will only appear on the page editor when my theme is active on the site. And I have some specific "handler" categories that my theme installs into the site and later uses to determine layout elements.

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• Windows C++: LPCTSTR vs const TCHAR

  - by mrl33t

  In my application i'm declaring a string variable near the top of my code to define the name of my window class which I use in my calls to RegisterClassEx, CreateWindowEx etc.. Now, I know that an LPCTSTR is a typedef and will eventually follow down to a TCHAR (well a CHAR or WCHAR depending on whether UNICODE is defined), but I was wondering whether it would be better to use this: static LPCTSTR szWindowClass = TEXT("MyApp"); Or this: static const TCHAR szWindowClass[] = TEXT("MyApp"); I personally prefer the use of the LPCTSTR as coming from a JavaScript, PHP, C# background I never really considered declaring a string as an array of chars. But are there actually any advantages of using one over the other, or does it in fact not even make a difference as to which one I choose? Thank you, in advanced, for your answers.

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• Dynamic memory allocation with default values

  - by viswanathan

  class A { private: int m_nValue; public: A() { m_nValue = 0; } A(int nValue) { m_nValue = nValue); ~A() {} } Now in main if i call A a(2);// 2 will be assigned for m_nValue of object A. Now how do we do this if i want to define an array of objects. Also how do we do this if i dynamically create objects using operator new like A *pA; pA = new A[5];// while creating the object i want the parameterised constructor to be //called I hope the question is clear. Do let me know if more explanation is needed

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• Approach to Selecting top item matching a criteria

  - by jkelley

  I have a SQL problem that I've come up against routinely, and normally just solved w/ a nested query. I'm hoping someone can suggest a more elegant solution. It often happens that I need to select a result set for a user, conditioned upon it being the most recent, or the most sizeable or whatever. For example: Their complete list of pages created, but I only want the most recent name they applied to a page. It so happens that the database contains many entries for each page, and only the most recent one is desired. I've been using a nested select like: SELECT pg.customName, pg.id FROM ( select id, max(createdAt) as mostRecent from pages where userId = @UserId GROUP BY id ) as MostRecentPages JOIN pages pg ON pg.id = MostRecentPages.id AND pg.createdAt = MostRecentPages.mostRecent Is there a better syntax to perform this selection?

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• Team activity/game for illustrating design in a SCRUM environment

  - by njreed.myopenid.com

  I'm looking for a team building / training activity for some of my scrum teams. I want something that really illustrates the flexibility that the team has when implementing stories to define the scope and complexity of the feature themselves. Most of the teams have long-term waterfall experience and are used to having a well-defined specification. I'm looking for something that illustrates the need for the team to vary the scope of what they are building themselves, dependent on the time and resources available. I couldn't find anything at tastycupcakes.com and Google wasn't much help. Maybe someone has prepared something themselves they would care to share?

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• Read external HTML page and then find data within

  - by inthewayboy

  I'm playing around with an idea, and I'm stuck at this one part. I want to read an external HTML page and then extract the data held within two <dd> tags. I've been using file_get_contents with good results, but I'm at a loss as to how to accomplish that last part. The two tags I want to extract the value from are always enclosed within a particular <div>, was wondering if that might help? In my mind it reads the entire html file into a string, then dumps all the data up until this one particular <div>, and dumps all the data after the closing </div>. Is that possible? I think this needs regex syntax which I've never used yet. So any tips, links, or examples would be great! I can provide more info as necessary.

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• c++ possible errors

  - by lego69

  hello I've got error a1 was not declared in this scope, can somebody please explain me my fault my header: #ifndef QUIZ_H_ #define QUIZ_H_ #include "quiz.cpp" class A { private: int player; public: A(int initPlayer); ~A(); void foo(); }; #endif /* QUIZ_H_ */ implementation of class functions: #include "quiz.h" #include <iostream> using std::cout; using std::endl; A::A(int initPlayer = 0){ player = initPlayer; } A::~A(){ } void A::foo(){ cout << player; } my main #include "quiz.h" int main() { quiz(7); return 0; } function quiz: #include "quiz.h" void quiz(int i) { A a1(i); a1.foo(); }

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• php: parse error on mysql query

  - by dwstein

  I'm getting the following error: Parse error: syntax error, unexpected T_VARIABLE in /home/a4999406/public_html/willingLog.html on line 48 on the following code (line 48 is first row of this code): $rows = mysql_num_rows($result); for ($j=0; $j<$rows: ++$j) { echo 'ID: ' . mysql_result($result, $j, 'id') . '<br />'; echo 'First: ' . mysql_result($result, $j, 'first') . '<br />'; echo 'Last: ' . mysql_result($result, $j, 'last') . '<br />'; echo 'Email: ' . mysql_result($result, $j, 'email') . '<br />'; } Anyone know what i'm doing wrong?

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• Compare to a defined constants in C?

  - by J.W.

  I am trying to compare to a defined constants in C, and I have simplified my program to the following.. #include "stdio.h" #include "stdlib.h" #define INVALID_VALUE -999; int main(int argc, const char* argv[]) { int test=0; if(test==INVALID_VALUE) //The error line.. return INVALID_VALUE; return 0; }; And when I use gcc to compile. it gives out error "error: expected ‘)’ before ‘;’ token" Any reason that this cannot be done.

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• C++ file including C header file

  - by fdeslaur

  I need to include a C header file in my C++ project but g++ throws "not declared in this scope" errors. I read that i need to use extern "C" keyword to fix it but it didn't seem to work for me. Here is a dummy example triggering this error. main.cpp: #include <iostream> extern "C" { #include "includedFile.h" } int main() { int a = 2; int b = 1212; std::cout<< "Hello World!\n"; return 0; } includedFile.h #include <stdint.h> enum TypeOfEnum { ONE, TWO, THREE, FOUR = INT32_MAX, }; The error thrown is : $> g++ main.cpp In file included from main.cpp:4:0: includedFile.h:7:9: error: ‘INT32_MAX’ was not declared in this scope FOUR = INT32_MAX, I saw on this post that I may need #define __STDC_LIMIT_MACROS without any success. Any help is welcome!

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• why Haskell can deduce [] type in this function

  - by Sili

  rho x = map (((flip mod) x).(\a -> a^2-1)) (rho x) This function will generate an infinite list. And I tested in GHCi, the function type is *Main> :t rho rho :: Integral b => b -> [b] If I define a function like this fun x = ((flip mod) x).(\a -> a^2-1) The type is *Main> :t fun fun :: Integral c => c -> c -> c My question is, how can Haskell deduce the function type to b - [b]? We don't have any [] type data in this function. Thanks!

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• What is the right way to modify a wordpress query in a plugin?

  - by starepod

  Basically i am playing with a plugin that allows future-dated posts on archive pages. My question is broader than this specific functionality, but everyone likes some context. I have my head around many of the plugin development concepts, but must be missing something very basic. I can successfully rewrite a query that gives me the results i want like this: function modify_where( $where ) { global $wp_query; // define $year, $cat, etc if( is_archive() ) { $where = " AND YEAR(wp_posts.post_date)='".$year."' AND wp_term_taxonomy.taxonomy = 'category' AND wp_term_taxonomy.term_id IN ('".$cat."') AND wp_posts.post_type = 'post' AND (wp_posts.post_status = 'publish' OR wp_posts.post_status = 'future')"; } return $where; } add_filter('posts_where', 'catCal_where' ); However, if i attempt to create a new WP_Query('different_query_stuff') after the main loop the new query uses the same WHERE statement outlined above. The question is : What am I missing? Thanks.

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• why does the data property in an jquery ajax call override my return false?

  - by user315709

  hi, i have the following block of code: $("#contact_container form, #contact_details form").live( "submit", function(event) { $.ajax({ type: this.method, url: this.action, data: this.serialize(), success: function(data) { data = $(data).find("#content"); $("#contact_details").html(data); }, }); return false; } ; when i leave out the data: this.serialize(), it behaves properly and displays the response within the #contact_details div. however, when i leave it in, it submits the form, causing the page to navigate away. why does the presence of the data attribute negates the return false? (probably due to a bug that i can't spot...) also, is the syntax to my find statement correct? it comes back as "undefined" even though i use a debugger to check the ajax response and that id does exists. thanks, steve

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• can't compile min_element in c++

  - by Vincenzo

  This is my code: #include <algorithm> #include <vector> #include <string> using namespace std; class A { struct CompareMe { bool operator() (const string*& s1, const string*& s2) const { return true; } }; void f() { CompareMe comp; vector<string*> v; min_element(v.begin(), v.end(), comp); } }; And this is the error: error: no match for call to ‘(A::CompareMe) (std::string*&, std::string*&)’ test.cpp:7: note: candidates are: bool A::CompareMe::operator()(const std::string*&, const std::string*&) const I feel that there is some syntax defect, but can't find out which one. Please, help!

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• Query "where clause" fails when calling a function

  - by guest1

  Hi All, I have a function in Access VBA that takes four parameters.The fourth parameter is a "where clause" that I use in an SQL statement inside the function. The function fails when I include the fourth parameter (where clause). When I remove this fourth parameter, the function just works fine. I am not sure if there is anything wrong with the syntax of the fourth parameter ? Please help. here is the function as called in the Query FunctionA('Table1','Field1',0.3,'Field2=#' & [Field2] & '# and Value3="' & [Value3] & '"') AS Duration_Field

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• how to visualize (value, count) dataset with thousands data points

  - by user510040

  I have a file with 2 numeric columns: value and count. File may have 5000 rows. I do plot(value, count) to find the shape of distribution. But because there are too many data points the picture is not very clear. Do you know better visualization approach? Probably histograms or barplot with grouping close values on x axis will be the better way to look on data? I cannot figure out the syntax of using histogram or barplot for my case.

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• Can you explain how this ip_to_string function works?

  - by user198729

  #define IPTOSBUFFERS 12 char *iptos(u_long in) { static char output[IPTOSBUFFERS][3*4+3+1]; static short which; u_char *p; p = (u_char *)&in; which = (which + 1 == IPTOSBUFFERS ? 0 : which + 1); _snprintf_s(output[which], sizeof(output[which]), sizeof(output[which]),"%d.%d.%d.%d", p[0], p[1], p[2], p[3]); return output[which]; } Is there something I'm missing to understand it?

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