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• C++ copy constructor and shallow copy

  - by bartek

  Hi, suppose I have a class with many explicit (statically allocated) members and few pointers that are allocated dynamically. When I declare a copy constructor in witch I make a deep copy of manually allocated members, I wouldn't like to copy each statically allocated member explicite. How can I use implicit (default) copy constructor functionality in explicit copy constructor?

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• Why can't I set a nullable int to null in a ternary if statement?

  - by Abe Miessler

  The C# code below: int? i; i = (true ? null : 0); gives me the error: Type of conditional expression cannot be determined because there is no implicit conversion between '' and 'int' Shouldn't this be valid? What am i missing here?

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• Tools to convert option strict off code into option strict on?

  - by deerchao

  I have to take over a project written in vb.net, which more than 400k lines of code written in option strict off mode. I want to build it under option strict on first before I do anything else -- which maybe converting it into C#. I found there's thousands of lines of code raises compilation error, mostly are about implicit type casts. Is there any tool would help to make it compile under option strict on mode if I don't want to correct every single line manually?

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• Built-in precedence for Expression Trees?

  - by jdk

  I'm unable to find the .NET FCL built-in concept of precedence to leverage while constructing Expression Trees. Ref System.Linq.Expressions Namespace. Is this something that must be handled manually in code, or is it somehow implicit and I'm not recognizing it, maybe through helper methods or classes? I want to apply it to math operations to ensure 3 + 5 * 10 results in 53 instead of 80.

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• Link User32 with gcc

  - by Tim Cooper

  I have a C program which has a function call that is defined in windows.h (which I have included), however, when I try and compile it with gcc, I get the error: warning: implicit declaration of function `LockWorkStation' I looked at the MSDN documentation and I see that this function is the User32 library file, and I was wondering how I would go about linking that to my file.

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• Is it possible in .NET 3.5 to specify an enum type?

  - by RoboShop

  I have a enumerator which map to a bunch of int example enum MyEnum { Open = 1, Closed = 2, Exit = 4 } I find though that when I want to assign this to an integer, I have to cast it first. int myEnumNumber = **(int)** MyEnum.Open; Is it possible to specify the type of an enum so that it is implicit that there is a integer assigned to any value within the enum? That way, I do not need to keep casting it to an int if I want to use it thanks

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• Is there any real possibility/example of useful `weak' typing policy implementation?

  - by Bubba88

  Are the implicit type coercions the absoulte evil? Or the history does know a decent implementation of what I've never heard.. Is `weak' typing doomed to be implemented in a way it is done in PHP, Javascript etc.?

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• Probably silly question about Nullable in .NET

  - by Andrew

  Here is example from J. Richter book "CLR via C#": Nullable<Int32> y = null; How exactly this works? Nullable is a struct, and I can not figure out is this compiler special support or implicit boxing of null value or something else.

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• What is this conversion called?

  - by LoudNPossiblyRight

  Is there a name or a term for this type of conversion in the c++ community? Has anyone seen this conversion be referred to as "implicit conversion"? class ALPHA{}; class BETA{ public: operator ALPHA(){return alpha;} private: ALPHA alpha; }; void func(ALPHA alpha){} int main(){ BETA beta; func(beta); return 0; }

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• Can one create Sized Types in Scala?

  - by Jens Schauder

  Is it possible to create types like e.g. String(20) in scala? The aim would be to have compiler checks for things like: a: String(20) b: String(30) a = b; // throws a compiler exception when no implicit conversion is available b= a; // works just fine Note: It doesn't need to be/named String

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• Exporting DLL C++ Class , question about .def file

  - by Vhaerun

  I want to use implicit linking in my project , and nmake really wants a .def file . The problem is , that this is a class , and I don't know what to write in the exports section . Could anyone point me in the right direction ? The error message is the following : NMAKE : U1073: don't know how to make 'DLLCLASS.def' P.S: I'm trying to build using Windows CE Platform Builder .

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• C++ superclass constructor calling rules

  - by levik

  What are the C++ rules for calling the superclass constructor from a subclass one?? For example I know in Java, you must do it as the first line of the subclass constructor (and if you don't an implicit call to a no-arg super constructor is assumed - giving you a compile error if that's missing).

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• Is scala's cake pattern possible with parametrized components?

  - by Nicolas

  Parametrized components work well with the cake pattern as long as you are only interested in a unique component for each typed component's, example: trait AComponent[T] { val a:A[T] class A[T](implicit mf:Manifest[T]) { println(mf) } } class App extends AComponent[Int] { val a = new A[Int]() } new App Now my application requires me to inject an A[Int] and an A[String], obviously scala's type system doesn't allow me to extends AComponent twice. What is the common practice in this situation ?

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• How can c let a function declaration with any parameter type ?

  - by kamil çakir

  I forgot to write void parameter but it works the i put void it gives error it lets this: print(int size,int table[size][size]){ int i,j; printf("-------TABLE-------\n"); for(i = 0;i it says"previos implicit declaration was here " (means the call in main) void print(int size,int table[size][size]){ int i,j; printf("-------TABLE-------\n"); for(i = 0;i

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• How can c let a function declaration with any parameter type ?

  - by kamil çakir

  it lets this function declaration print(int size,int table[size][size]){ int i,j; printf("-------TABLE-------\n"); for(i = 0;i gives error in this situation 44 C:\Users.. previous implicit declaration of 'print' was here (print(size,table); call in main) void print(int size,int table[size][size]){ int i,j; printf("-------TABLE-------\n"); for(i = 0;i

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• Listing an application's activity and intent-filters?

  - by MBonig

  I am interested in activating another application's activity. I know from reading the Android SDK that it's probably better to do this with an implicit intent. However, this activity doesn't reside in an application I own, so I don't know the action and category and data flags on the intent-filter. How can I examine an Android applications metadata like the activity classes and the intent-filters for those activities (if declared in the manifest)? Thanks!

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• I have a feeling that adding fields marked with @Transient annotation to entity is very bug-prone. A

  - by Roman

  I have some philosophical feeling that adding to an entity fields which doesn't mapped to the DB is a wrong way of solving problems. But are there any concrete situations where using @Transient fields leads to implicit and hard fixing problems? For example, is it possible that adding/removing 2nd level cache will break our app when there are @Transient fields in our entities?

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• Is there a Pattern in Scala that add a method to an Array object?

  - by Fred Haslam

  Is there a Pattern in Scala that can add a method to an Array object? I am thinking of the implicit conversion of Int to RichInt. But that can't be done as Array is a final class.

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• In SQL Server, how do I know what transaction mode I'm currently using?

  - by Yousui

  Hi guys, In SQL Server, how do I know what transaction mode I'm currently using? Such as autocommit, explicit, or implicit. And how can I change one mode to another using tsql? Great thanks.

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• Working with wchar in C

  - by Richard Mar.

  I have this code: #include <stdio.h> #include <wchar.h> int main() { wchar_t *foo = L"ðh"; wprintf(L"[%ls]\n", foo); return 0; } And when I compile it, it gives me the implicit declaration of function ‘wprintf’ warning. I know that I should link the wchar library during compilation, but how do I do that?

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• How to unimport String "+" operator in Scala?

  - by Alex R

  I'm writing a DSL where the "+" operator is strictly numeric, and the String "+" operator is messing up my implicit conversions. What's the syntax for unimporting an operator of the String class? Thanks

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• Why does this anonymous function starting with println result in a NullPointerException?

  - by noahz

  I am learning about pmap and wrote the following function: (pmap #((println "hello from " (-> (Thread/currentThread) .getName)) (+ %1 %2)) [1 1 1] [-1 -1 -1]) When run, the result is a NullPointerException (hello from clojure-agent-send-off-pool-4 hello from clojure-agent-send-off-pool-3 hello from clojure-agent-send-off-pool-5 NullPointerException user/eval55/fn--56 (NO_SOURCE_FILE:11) Why is this happening? I have understood and observed the body of a fn to be an implicit do.

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• Are zip code and postal code violation of 3rd normal form?

  - by ojblass

  Given that state information is implicit in the zip code aren't storing both of them some violaiton of third normal form? Can or should you simply combine them into one field?

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• malloc in kernel

  - by yoavstr

  when i try to malloc at kernel mod i get screamed by the compiler : res=(ListNode*)malloc(sizeof(ListNode)); and the compiler is screaming : /root/ex3/ex3mod.c:491: error: implicit declaration of function ‘malloc’ what should i do ?

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• generating random enums

  - by null_radix

  How do I randomly select a value for an enum type in C++? I would like to do something like this. enum my_type(A,B,C,D,E,F,G,h,J,V); my_type test(rand() % 10); But this is illegal... there is not an implicit conversion from int to an enum type.

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