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• Difference between static and shared library in C

  - by Mohit Deshpande

  What is the difference??? I use Eclipse and there are several project types including Static Libraries and Shared Libraries? Does one have an advantage over the other?

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• conflicting declaration when filling a static std::map class member variable

  - by Max

  I have a class with a static std::map member variable that maps chars to a custom type Terrain. I'm attempting to fill this map in the class's implementation file, but I get several errors. Here's my header file: #ifndef LEVEL_HPP #define LEVEL_HPP #include <bitset> #include <list> #include <map> #include <string> #include <vector> #include "libtcod.hpp" namespace yarl { namespace level { class Terrain { // Member Variables private: std::bitset<5> flags; // Member Functions public: explicit Terrain(const std::string& flg) : flags(flg) {} (...) }; class Level { private: static std::map<char, Terrain> terrainTypes; (...) }; } } #endif and here's my implementation file: #include <bitset> #include <list> #include <map> #include <string> #include <vector> #include "Level.hpp" #include "libtcod.hpp" using namespace std; namespace yarl { namespace level { /* fill Level::terrainTypes */ map<char,Terrain> Level::terrainTypes['.'] = Terrain("00001"); // clear map<char,Terrain> Level::terrainTypes[','] = Terrain("00001"); // clear map<char,Terrain> Level::terrainTypes['\''] = Terrain("00001"); // clear map<char,Terrain> Level::terrainTypes['`'] = Terrain("00001"); // clear map<char,Terrain> Level::terrainTypes[178] = Terrain("11111"); // wall (...) } } I'm using g++, and the errors I get are src/Level.cpp:15: error: conflicting declaration ‘std::map, std::allocator yarl::level::Level::terrainTypes [46]’ src/Level.hpp:104: error: ‘yarl::level::Level::terrainTypes’ has a previous declaration as ‘std::map, std::allocator yarl::level::Level::terrainTypes’ src/Level.cpp:15: error: declaration of ‘std::map, std::allocator yarl::level::Level::terrainTypes’ outside of class is not definition src/Level.cpp:15: error: conversion from ‘yarl::level::Terrain’ to non-scalar type ‘std::map, std::allocator ’ requested src/Level.cpp:15: error: ‘yarl::level::Level::terrainTypes’ cannot be initialized by a non-constant expression when being declared I get a set of these for each map assignment line in the implementation file. Anyone see what I'm doing wrong? Thanks for your help.

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• Use reflection to get a list of static classes

  - by Christian

  Hi, many questions are close, but none answers my problem... How do I use reflection in C# 3.5 to get all classes which are static from an assembly. I already get all Types defined, but there is no IsStatic property. Counting 0 constructors is really slow and did not work either. Any tips or a line of code? :-) Chris

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• present a static page url as different url which is SEO friendly

  - by Gaurav Sharma

  Hi, I have developed a site, which has some static pages. Like explore, home, feedback. The link for these goes as follows website.com/views/explore.php website.com/index.php website.com/views/feedback.php I want to write a different SEO URL for each of the URL mentioned above. Is it possible ? i.e. for example website.com/views/explore.php should be convereted/visible as website.com/explore website.com/views/feedback.php should be convereted/visible as website.com/give/feedback and so on

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• Getting value of public static final field/property of a class in Java via reflection

  - by Viet

  Say I have a class: public class R { public static final int _1st = 0x334455; } How can I get the value of the field/property "_1st" via reflection?

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• final and private static

  - by xdevel2000

  I read that doing: public final void foo() {} is equals to: private static void foo() {} both meaning that the method is not overridable! But I don't see the equivalence if a method is private it's automatically not accessible...

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• C++ where to initialize static const

  - by Thomas

  Hi, I have a class class foo { public: foo(); foo( int ); private: static const string s; }; Where is the best place to initialize the string s in the source file?

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• Why use singleton instead of static class?

  - by Jouke van der Maas

  When would a singleton actually be easier or better than a static class? It seems to me creating a singleton is just extra effort that's not actually needed, but I'm sure there is a good reason. Otherwise, they wouldn't be used, obviously.

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• Static Memory allocation & Portability

  - by user332354

  I have read Static Memory Allocation are done during Compile time. Is the 'address allocated' used while generating executables ? Now,I am in doubt that how the memory allocation is handled when the code executable is transferred completely to a new system. I searched for it but I didn't get any answer on Internet.

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• Why use sinlgeton instead of static class?

  - by Jouke van der Maas

  When would a singleton actually be easier or better than a static class? It seems to me creating a singleton is just extra effort that's not actually needed, but I'm sure there is a good reason. Otherwise, they wouldn't be used, obviously.

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• Static constructors cause a performance over head ?

  - by AB Kolan

  Recently read in a article on dotnetpearls.com here saying that static ctors take a substantial amount of perfomance hit. Could not fathom why ?

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• Creating a C++ static lib to use with Java on Android

  - by Josh

  I have some C++ code that I want to make into a static lib for use with Java on the Android platform. Can anyone point me to a resource that tells me how to do this? I am completely new to Java and Android.

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• Use arrayaccess with static class

  - by user308776

  Hello, how I can use array acces with my static class? F.e. I like to execute next script: class A { ... } A['p'] = 15; echo isset(A['p']) ? A['p'] : 0;

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• making graph/map of functions/methods calls in c# code (visual studio 2008)

  - by Y. Shoham

  I have some c# projects in visual studio 2008, and I want to get graph (map? table?) of all methods calls. I want it static, not runtime (like "call stack"); any function - who calls it, and how many times, etc. I can Find All References method after method, and copy each call to table or Graphviz file, but it will take few hours. Is there an automatic tool or plugin that can help?

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• Invoking methods on objects in java.

  - by David

  If i have a class called Dice which contains this method: public void roll () { this.x = randNum(1, this.sum.length) ; this.sum[x] ++ ; } And i am in a diferent class how do i invoke this method? I am currently trying InstanceOfObjectName.Dice.roll and its not working. What should i do?

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• Howto UML: sub methods / calls / operations / procedures

  - by hsmit

  How would you guys model this in UML (in a sequence diagram)? .. car1.drive(); .. ... in Car class: .. drive(){ this.startEngine(); } startEngine(){ this.getKey(); this.insertKey(); } .. a small begin: objx car1 ---- ---- | | | drive() | |-------->| startEngine() | |------------. | | | | |<-----------. | | But where comes the getKey() method? Must this be communicated via another sequence diagram? Or is there a way to include sub procedures?

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• Implementation code of native methods

  - by Tapas Bose

  At first I want to let you know that this question is not related with What is native implementation in Java. I got many useful information from that thread. I want to know that are the codes of the native implementations available? I have jdk source code but I can not find the native codes for System.currentTimeMillis or Runtime.getRuntime().availableProcessors() or other native method. Thanks and regards.

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• What are guard methods/classes?

  - by Paul Sasik

  i just noticed the guard method/class mentioned in this question and i don't really get the concept from the answers. And alas, Jon Skeet's link to an MS site never loaded. A few quick Google searches seemed to yield only products, not software engineering concepts. Any explanation and/or samples would be appreciated. (Especially from the .Net side of things.)

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• C# naming convention for extension methods for interface

  - by Sarah Vessels

  I typically name my C# interfaces as IThing. I'm creating an extension method class for IThing, but I don't know what to name it. On one hand, calling it ThingExtensions seems to imply it is an extension class to some Thing class instead of to the IThing interface. It also makes the extension class be sorted away from the interface it extends, when viewing files alphabetically. On the other hand, naming it IThingExtensions makes it look like it is an interface itself, instead of an extension class for an interface. What would you suggest?

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• Initiate methods after selecting an item in a browser

  - by djerry

  Hey there, I'm making an application which monitors and initiates phone calls over ip with innovaphone devices. I'm doing this in wpf. My client asks me if it is possible when he rightclicks on a phone number in a browser, he can initiate a call. So i there anyway to trigger a method after right_clicking a phone number? Thanks in advance.

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• Methods : Make my method with many input variables with out overloading

  - by Jack Jon

  is there Any Way To Make my Method Take many input variable but with out overloading ... could be my question not clear ... I mean Like That : if I Have This Method public void setValues (int val1,int val2 ,String val3){ } what I want is : use this method with many way setValues (val1,val2) OR setValues (val3) why I want to do that with out overloading : Because if i have as example 10 variable i want to add many method with overloading but i don't like that ... is there any way helps me to check variable or skip it in the same method .. Thanks for help .

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• bridge methods explaination

  - by xdevel2000

  If I do an override of a clone method the compiler create a bridge method to guarantee a correct polymorphism: class Point { Point() { } protected Point clone() throws CloneNotSupportedException { return this; // not good only for example!!! } protected volatile Object clone() throws CloneNotSupportedException { return clone(); } } so when is invoked the clone method the bridge method is invoked and inside it is invoked the correct clone method. But my question is when into the bridge method is called return clone() how do the VM to say that it must invoke Point clone() and not itself again???

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• GetRef to capture methods?

  - by Thom Smith

  I've just discovered VBScript's GetRef function, which gets a reference to the function named by its argument. Is there any way to get a reference to a method in this way? I have a hunch that VBScript doesn't offer the sophistication of binding needed to do so, but it would sure be nice.

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• link with static library vs individual object files

  - by dododo

  For a reason i want to unpack a static lib (libx.a) into individual object files (a.o b.o c.o), and specify these object files (a.o b.o c.o) in the linker input list instead of libx.a, with other linker options remaining the same. However, i have noticed the above change has resulted in quite some difference in the output executable. Basically, (a.o b.o c.o) method will result in larger output size. So what's the difference between the two methods (libx.a and individual object files)? And is there a way to work around? The GNU binutil (for and ar ld) version i'm using is 2.16.1 Thanks.

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• Python calling class methods with the wrong number of parameters

  - by Hussain

  I'm just beginning to learn python. I wrote an example script to test OOP in python, but something very odd has happened. When I call a class method, Python is calling the function with one more parameter than given. Here is the code: 1. class Bar: 2. num1,num2 = 0,0 3. def __init__(num1,num2): 4. num1,num2 = num1,num2 5. def foo(): 6. if num1 num2: 7. print num1,'is greater than ',num2,'!' 8. elif num1 is num2: 9. print num1,' is equal to ',num2,'!' 10. else: 11. print num1,' is less than ',num2,'!' 12. a,b,t = 42,84,bar(a,b) 13. t.foo 14. 15. t.num1 = t.num1^t.num2 16. t.num2 = t.num2^t.num1 17. t.num1 = t.num1^t.num2 18. 19. t.foo 20. And the error message I get: python test.py Traceback (most recent call last): File "test.py", line 12, in a,b,t = 42,84,bar(a,b) NameError: name 'bar' is not defined Can anyone help? Thanks in advance

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