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• how to define a structural type that refers to itself?

  - by IttayD

  I want to create a method sum that I can call on different types, specifically sum(1,2). def sum[A](a1: A, a2: A) = a1 + a2 This fails because the compiler can't tell if A has a method '+' I tried to define a structural type: type Addable = {def +(a: Addable)} This fails because of an illegal cyclic reference How can I achieve this in a type safe way without requiring A to extend a specific trait?

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• Why does javac complain about not initialized variable?

  - by Marcus

  For this Java code: String var; clazz.doSomething(var); Why does the compiler report this error: Variable 'var' might not have been initialized I thought all variables or references were initialized to null. Why do you need to do: String var = null; ??

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• How to convert system time to 64 bit file time structure of NTFS in DOS

  - by user329713

  I am using DJGPP compiler for DOS in that i have to use WINDOWS.h which is a win32 api for conversion of system time to file time for NTFS file system.As windows.h is win32 api it is giving error "windows.h-no such file or directory".So how to convert system time to file time (i.e.8 byte structure) in NTFS file system for NTFS file system in DOS.

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• OK Programming language from USB stick with no installation

  - by tovare

  I'm looking for a compiler or interpreter for a language with basic math support and File IO which can be executed directly from a memorystick in either Linux or Windows. Built in functionality for basic datastructures and sorting/searching would be a plus. (I've read about movable python, but it only supports windows) Thank you

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• C++ Map of Vector of Structs?

  - by garsh0p

  So here's a snippet of my code: struct dv_nexthop_cost_pair { unsigned short nexthop; unsigned int cost; }; map<unsigned short, vector<struct dv_nexthop_cost_pair> > dv; I'm getting the following compiler error: error: ISO C++ forbids declaration of `map' with no type What's the proper way to declare this?

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• Dictionary object syntax?

  - by posfan12

  I'm having trouble figuring out the syntax for a JScript .NET dictionary object. I have tried private var myDictionary: Dictionary<string><string>; but the compiler complains that it's missing a semicolon and that the Dictionary object is not declared. I know JScript does have a native dictionary-like object format, but I'm not sure if there are disadvantages to using it instead of the .NET-specific construct. I.e., what if someone wants to extend my script using another .NET language?

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• Qt: Is it possible to use mixins technique?

  - by Eye of Hell

  Hello. Qt library includes advanced meta-programming capabilities using they own preprocessing moc compiler. Does anyone knows, is it possible to create some kind of mix-ins via it? For example, i have a QString and want to add a method to it without sub-classing and changing existing code. Does Qt have such solutions for that?

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• How Do I Make a PHP Module with the Vala Programming Language?

  - by Volomike

  This new language called Vala, which is said to be C#-like and supposedly easier than C++ or C, compiles down into C on Linux with the GCC compiler. Sounds great. Now I want to use it to make a PHP module so that slow PHP code can be made in Vala and imported into PHP as a function. How do I accomplish this in Vala? Is it even possible?

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• Sending data to a web site over HTTP

  - by sfactor

  i have a program that receives data from a wireless device over bluetooth...i now need to do some operations in the data and then send it to the website (web server!!!) as a .csv file...i also need to authenticate the device itself from it hardware address which is also obtained in the program.i am coding this in gcc linux compiler using C...can anyone tell me how do i go about doing this?

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• Using custom dll in Qt Application

  - by Donotalo

  First, my compiler and OS: Qt Creator 1.3 Qt 4.6 (32 bit) Windows 7 Ultimate I want to learn how to create and import a dll in Qt. I've created a *.dll file using Qt Creator, called Shared1.dll which contains nothing but an empty class named Shared1. Now I'd like to use Shared1 class in another Qt project. How can I do that? Thanks in advance.

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• C question: no warning ???

  - by Grv

  main() { printf("Hello World."); } Why does no warning is produced in gcc compiler even though we declare main() with return type 'int'

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• Expecting a LexBuffer<char> but given a LexBuffer<byte> The type 'char' does not match the type 'by

  - by user152518

  Type mismatch. Expecting a LexBuffer but given a LexBuffer The type 'char' does not match the type 'byte' This is the error message that I am getting while using fslex. I have tried manually checking every single occurrence of lexbuf and its type. It's LexBuffer everywhere. But still the compiler is giving me the above error. Can you please tell me why this error occurs and how to go about resolving it. Thanks, chandrasekhar

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• Write to XCode build transcript.

  - by eaigner

  Is there any way to write to the XCode build transcript? What i want to do, is throw a warning if a device is not attached to the computer instead of an assertion failure in my unit test cases (some cases rely on an attached ipod). I thought of something like the standard compiler warnings (only with custom message). Thanks.

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• behaviour of the implicit copy constructor / assignment operator

  - by Tobias Langner

  Hello, I have a question regarding the C++ Standard. Suppose you have a base class with user defined copy constructor and assignment operator. The derived class uses the implicit one generated by the compiler. Does copying / assignment of the derived class call the user defined copy constructor / assignment operator? Or do you need to implement user defined versions that call the base class? Thank you for your help.

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• Using Cmake with GNU Make: How can I see the exact commands?

  - by Nils

  I use Cmake with GNU Make and would like to see all commands exactly (for example how the compiler is executed, all the flags etc) GNU make has --debug, but it does not seem to be that helpful are there any other options? Does Cmake provide additional flags in the generated Makefile for debugging purpose?

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• oprofile unable to produce call graph

  - by aaa

  hello I am trying to use oprofile to generate call graph. Compiler is g++, platform is linux x86-64, linker is gfortran C++ code is compiled with -fno- omit-frame-pointer. oprofile is started with --callgraph=25. report I run with --callgraph. the call graph is produced but it's only includes self time, which is not much use what am I missing?

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• Is arithmetic overflow/underflow generally checked in .Net framework methods?

  - by YWE

  For example, let's use the Add method of the ArrayList class. If I am using the default compiler settings in Visual Studio C# project in which arithmetic overflow is not checked, would ArrayList.Add() throw an OverflowException if I added too many items? Would surrounding the method call with checked or unchecked make any difference? BTW, I would write a test program to determine the answer to this question if I had Visual Studio available to me right now.

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• Error in C Program

  - by Manoj

  Hi, while(((long)(1000*ratio*((long)clock()-(long)t0))%100)/1000)<Data_Read_Rate); The above line is generating the following error: "Syntax Error before < token". Why is this error coming up? I use MINGW32 for development(GCC compiler). Thanks...

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• When to use primitive and when complex types in java

  - by Gandalf StormCrow

  Hello, In which case should you use primitive types(int) or complex types(Integer)? Ex: http://stackoverflow.com/questions/2508918/why-java-compiler-does-not-like-integer-as-type-for-values-in-hashmap this example works with Integer type. Should we always use Integer as a complex type?

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• Hidden features of C

  - by bernardn

  I know there is a standard behind all C compiler implementations, so there should be no hidden features. Despite that, I am sure all C developers have hidden/secret tricks they use all the time.

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• What's the good of IDE's auto generated @override annotation ?

  - by Tony

  I am using eclipse , when I use shortcut to generate override implementations , there is an override annotation up there , I am using JDK 6 , this is all right , but under JDK 5 this annotation will cause an error, so I want to ask , if this annotation is completely useless ? Will compiler do some kind of optimization using this annotation ?

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• Installing gtk and compiling using gcc under windows?

  - by sil3nt

  I have gcc installed in c:/programfiles (also set as a path variable), and i have all the necessary files for gtk from http://www.gtk.org/download-windows.html, glib,gtk,pango,atk and cairo. Although I have no clue as to how to compile a c program using gtk with the gcc compiler. How do I set everything up so that it works?. (I don't know where each zip file goes.?) basically I don't really know where start.

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• what is your java 1.6 favorite feature

  - by ekeren

  what is your java 1.6 favorite feature? Java 6 has some nifty feature: SeriveLocator Support to Scripting language Acess to Compiler APT enhancement (Annotation) And more... What is the one you like the most, and found it very useful?

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• Actionscript 3 E4X working with MMS values in XML

  - by user150946

  I am building an application using Action script 3 I am retrieving some XML from the web however the node names are mms:Image mms:Results etc my action script compiler is throwing an error becuase it is not expecting to see the semi colon in the node name. How to I access the nodes? thanks

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• What is wrong with this code?

  - by Horatiu Paraschiv

  @protocol MyViewDelegate <NSObject> - (void) didFinishProcessing:(MyView*)myView; //compiler stops here with error @end @interface MyView : MySuperclass { id<MyViewDelegate> _delegate; } @property (nonatomic, retain) id<MyViewDelegate> delegate; @end When I try to compile I get " expected ')' before MyView ". Where is the error?

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