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• boost::function function pointer to parameters?

  - by high6

  How does boost::function take a function pointer and get parameters from it? I want wrap a function pointer so that it can be validated before being called. And it would be nice to be able to call it like boost::function is with the () operator and not having to access the function pointer member. Wrapper func; func(5); //Yes :D func.Ptr(5) //Easy to do, but not as nice looking

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• What trick does Java use to avoid spaces in >> ?

  - by kunjaan

  In the Java Generic Book, while contrasting the difference between C++ Templates and Java Generic says: In C++, a problem arises because without the space denotes the right-shift operator. Java fixes the problem by a trick in the grammar.) What is this trick?

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• LINQ TO SQL, Dynamic query with DATE type fields

  - by acanthus

  Hello, I'm building a query with the LINQ dynamic library so I don't know how many potential parameters will I have and I get an error when trying to query DATE type fields: Operator '=' incompatible with operand types 'DateTime' and 'String' When I step through the debugger in the Dynamic.cs it shows that the value is of type string and the field is of type date so the problem is obvious but I have no idea how to approach it. Any ideas? BR

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• Perl, foreach order

  - by Mike

  Does Perl's foreach loop operator require that the list items be presented in order? For example my @a=(1,2,3); foreach my $item (@a) { print $item; } will always print 1 2 3? I suspect so, but I can't find it documented.

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• what is size_t in C

  - by benjamin button

  Hi, i am getting confused with size_t in C. i know that it is returned by a sizeof operator. But what exactly it is?Is it a datatype? let's say i have a for loop int i; or size_t i;//which one should i use? for(i=0;i<some_size;i++)

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• Parallel computation of the median of a large array

  - by recipriversexclusion

  I got asked this question once and still haven't been able to figure it out: You have an array of N integers, where N is large, say, a billion. You want to calculate the median value of this array. Assume you have m+1 machines (m workers, one master) to distribute the job to. How would you go about doing this? Since the median is a nonlinear operator, you can't just find the median in each machine and then take the median of those values.

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• [C++ / NCURSES] Can't convert from 'int' to 'int *'

  - by flarn2006

  So I have these lines of code: int maxY, maxX; getmaxyx(stdscr, &maxY, &maxX); It gives me the following error: error C2440: '=' : cannot convert from 'int' to 'int *' Conversion from integral type to pointer type requires reinterpret_cast, C-style cast or function-style cast twice for each time I use it. I'm not even using the = operator! The curses.h file is included. What am I doing wrong?

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• Assign a list of integers to an @var

  - by justSteve

  I can: declare @idOrder int set @idOrder = 21319 I want: declare @idOrder int set @idOrder = (21319, 21320) for use in a series of statements where the 'WHERE' clause uses the IN operator delete Orders where idOrder in @idOrder instead of delete Orders where idOrder in (21319, 21320)

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• How do you pronounce "::"?

  - by Pillsy

  How do you pronounce C++'s scope operator :: when you read it aloud? Do you just say "colon-colon", or do you say something wittier or more euphonious?

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• C++ Why isn't call by reference needed for strcpy()

  - by Ribbs

  I have a homework assignment with a number of questions. One is asking why the strcpy() function doesn't need the call by reference operator for CStrings. I've looked through the book numerous times and I can't, for the life of me, find the answer. Can anyone help explain this to me? It is an array of sorts so I would think you would need the call by reference.

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• Circular increment: Which is "better"?

  - by Helper Method

  When you have a circular buffer represented as an array, and you need the index to wraparound (i.e., when you reach the highest possible index and increment it), is it "better" to: return (i++ == buffer.length) ? 0: i; Or return i++ % buffer.length; Has using the modulo operator any drawbacks? Is it less readable than the first solution?

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• C++ std::vector capacity

  - by aaa

  hi. does vector::operator= change vector capacity? if so, how? does copy constructor copy capacity? I looked through documentation but could not find specific answer. is it implementation dependent? Thanks

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• How to test my application With STL such as vector to make sure weather it works or not in c++?

  - by Sam

  *we release and the acquire the pointer with the Linked_ptr in parameter */ Linked_ptr& operator=(const Linked_ptr& r) { if (this != &r) { release(); acquire(r); } return *this; }

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• How Java do the string concatenation using "+"?

  - by Tom Brito

  I read about the way Java works with += operator, using StringBuilder. Is it the same with a ("a" + "b") operation?

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• Operation precedence on postgress

  - by user24691

  I have set new division on postgress pg_operator table because i want tath when is division by zero return 0. i have write this: create operator / ( procedure = zero_division, leftarg = double precision, rightarg = double precision); where zero_division is: CREATE OR REPLACE FUNCTION zero_division(double precision, double precision) RETURNS double precision AS 'select case when $2 = 0 then 0 else $1 / $2::real end;' LANGUAGE sql IMMUTABLE COST 100; when i run value/ 0 i get error of division.

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• How to differenciate two tables

  - by Nemat

  Hi friends.... I have two tables.I want to get all records from one table that are different from the records in second table. For eg. if we have four records in first table like A,B,C,D and three records in second table thats A,B,C then the answer of query should be D. I have tried "EXCEPT" operator but it doesnt work fine.Kindly help me in writing correct query for the given problem. Any help is appreciated.... Thanks in Advance Nemat

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• [game] How is it possible to legally write ::: in C++ and ??? in C#?

  - by daveny

  These questions are a kind of game, and I did not find the solution for them. It is possible to write ::: in C++ without using quotes or anything like this and the compiler will accept it (macros are prohibited too). And the same is true for C# too, but in C#, you have to write ???. I think C++ will use the :: scope operator and C# will use ? : , but I do not know the answers to them. Any idea?

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• How to get number of entries in a Lua table?

  - by romkyns

  Sounds like a "let me google it for you" question, but somehow I can't find an answer. The Lua # operator only counts entries with integer keys, and so does table.getn: tbl = {} tbl["test"] = 47 tbl[1] = 48 print(#tbl, table.getn(tbl)) -- prints "1 1" count = 0 for _ in pairs(tbl) do count = count + 1 end print count -- prints "2" How do I get the number of all entries?

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• C++ template instantiation with identity argument

  - by aaa

  hello. I have ran into yet another problem I do not understand. The following does not instantiate, why? template<class E> void operator[](typename boost::mpl::identity<E>::type e) const; thank you for your help

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• Haskell lists difference

  - by user559354

  I'm trying make a lists difference. Found directly prelude operator \\\\ that makes lists difference. But errors Not in scope: '\\\\' occurs. Here is my simple from command line interpreter: Prelude> ([1,2,3] ++ [5,6]) -- works like expected [1,2,3,4,5,6] prelude> ([1,2,3] \\\\ [1,2]) -- erros occurs <interactive>:1:11: Not in scope: "\\\\" Thanks for explanation where I make a mistake.

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• Creating an instance within the Class itself

  - by didxga

  What's going on when the assignment statement executed at Line 4, does compiler ignore the new operator and keep the foo variable being null or something else happen to handle this awkward moment? public class Foo { // creating an instance before its constructor has been invoked, suppose the "initializing" // gets printed in constructor as a result of the next line, of course it will not print it private Foo foo = new Foo();//Line 4 public Foo() { System.out.println("initializing"); } }

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• returning aligned memory with new?

  - by Steve

  I currently allocate my memory for arrays using the MS specific mm_malloc. I align the memory, as I'm doing some heavy duty math and the vectorization takes advantage of the alignment. I was wondering if anyone knows how to overload the new operator to do the same thing, as I feel dirty malloc'ing everywhere (and would eventually like to also compile on Linux)? Thanks for any help

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• From Now() to Current_timestamp in Postgresql

  - by xRobot

  In mysql I am able to do this: SELECT * FROM table WHERE auth_user.lastactivity > NOW() - 100 now in postgresql I am using this query: SELECT * FROM table WHERE auth_user.lastactivity > CURRENT_TIMESTAMP - 100 but I get this error: operator does not exist: timestamp with time zone - integer How can I resolve ?

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• Shift Operators in C++

  - by Codeguru

  If the value after the shift operator is greater than the number of bits in the left-hand operand, the result is undefined. If the left-hand operand is unsigned, the right shift is a logical shift so the upper bits will be filled with zeros. If the left-hand operand is signed, the right shift may or may not be a logical shift (that is, the behavior is undefined). Can somebody explain me what the above lines mean??

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• sizeof, size_t and dtddef.h

  - by yCalleecharan

  Hi, if I'm using the sizeof operator and making use of size_t in my code, do I have necessarily have to include the preprocessor directive stddef.h ? I haven't included the stddef.h and my code compiles without warning with both MVS2008 and with Borland C++ BuilderX. Thanks a lot...

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