I want to check whether a value is equal to 1. Is there any difference in the following lines of code
Evaluated value == 1
1 == evaluated value
in terms of the compiler execution
Hi, if I have a protocal defined, then it always generate a lot of warnings when compile.
like
@property (retain) id <SomeProc> value
then in the code:
[value class]; ...
[value release]
the compiler always complain it "may not have class or release defined".
Is there a way to fix this?
2 Interfaces with same method names and signatures. But implmented by a single class then how the compiler will identify the which method is for which interface.In java.
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?
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?
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.
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?
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?
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;
??
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.
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?
Coming from Eclipse/Java, I noticed that in VisualStudio/C# it is not mandatory to care about Exceptions. While Eclipse forces the user to implement a try-catch-block or to add a throws declaration, this is not the case in Visual Studio.
What is the reason Visual Studio doesn't inform about unhandled exceptions?
Can I configure Visual Studio to force me to implement try-catch-blocks, or at least add a compiler-warning?
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?
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.
I have a very simple DLL written in unmanaged C++ that I access from my application. I recently switch to Visual Studio 2010, and the DLL went from 55k down to 35k with no code changes, and now it will no longer load in Windows 2000. I didn't change any code or compiler settings. I have my defines setup for 0x0500, which should include Windows 2000 support. Has anyone else run into this, or have any ideas of what I can do?
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?
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.
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...
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
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?
I have deployed successfully the dotnetopenid dll under IIS7 but on my shared hosting service it says:
Compilation Error Description: An
error occurred during the compilation
of a resource required to service this
request. Please review the following
specific error details and modify your
source code appropriately.
Compiler Error Message: CS0246: The
type or namespace name 'DotNetOpenId'
could not be found (are you missing a
using directive or an assembly
reference?)
Why ?
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.
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?
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 ?