Search Results

Search found 5015 results on 201 pages for 'compiler construction'.

Page 99/201 | < Previous Page | 95 96 97 98 99 100 101 102 103 104 105 106  | Next Page >

  • How to define an extern, C struct returning function in C++ using MSVC?

    - by DK
    The following source file will not compile with the MSVC compiler (v15.00.30729.01): /* stest.c */ #ifdef __cplusplus extern "C" { #endif struct Test; extern struct Test make_Test(int x); struct Test { int x; }; extern struct Test make_Test(int x) { struct Test r; r.x = x; return r; } #ifdef __cplusplus } #endif Compiling with cl /c /Tpstest.c produces the following error: stest.c(8) : error C2526: 'make_Test' : C linkage function cannot return C++ class 'Test' stest.c(6) : see declaration of 'Test' Compiling without /Tp (which tells cl to treat the file as C++) works fine. The file also compiles fine in DigitalMars C and GCC (from mingw) in both C and C++ modes. I also used -ansi -pedantic -Wall with GCC and it had no complaints. For reasons I will go into below, we need to compile this file as C++ for MSVC (not for the others), but with functions being compiled as C. In essence, we want a normal C compiler... except for about six lines. Is there a switch or attribute or something I can add that will allow this to work? The code in question (though not the above; that's just a reduced example) is being produced by a code generator. As part of this, we need to be able to generate floating point nans and infinities as constants (long story), meaning we have to compile with MSVC in C++ mode in order to actually do this. We only found one solution that works, and it only works in C++ mode. We're wrapping the code in extern "C" {...} because we want to control the mangling and calling convention so that we can interface with existing C code. ... also because I trust C++ compilers about as far as I could throw a smallish department store. I also tried wrapping just the reinterpret_cast line in extern "C++" {...}, but of course that doesn't work. Pity. There is a potential solution I found which requires reordering the declarations such that the full struct definition comes before the function foward decl., but this is very inconvenient due to the way the codegen is performed, so I'd really like to avoid having to go down that road if I can.

    Read the article

  • Explain why MickroC pic18f4550 HID example works

    - by Dr Deo
    MickroC compiler has a library for HID(Human Interface Device) usb communication. In the supplied samples, they specify that the buffers below should be in USB ram and use a pic18f4550. unsigned char readbuff[64] absolute 0x500; // Buffers should be in USB RAM, please consult datasheet unsigned char writebuff[64] absolute 0x540; But the pic18f4550 datasheet says USB ram ranges from 400h to 4FFh So why does their example work when their buffers appear not to be between 400h to 4FFh? Link to full source

    Read the article

  • drools.NET exception

    - by Lily
    Hi, I am using Drools.NET and got an exception when it is being called. The type initializer for 'org.drools.compiler.PackageBuilderConfiguration' threw an exception. InitializeComponent(); _Form = this; PackageBuilder builder = new PackageBuilder(); the exception comes a the line PackageBuilder builder = new PackageBuilder();

    Read the article

  • netcon.h not found with mingw?

    - by cftmon
    I am using the mingw(4.4.0) compiler that is included with QT4 and my IDE is netbeans 6.9. i noticed that i can't find netcon.h when i try to include it.I need netcon.h because i need some kind of API to bring up/down a network adapter,and after some googling i found that netcon.h is most commonly used. Linking netcon.h directly from the microsoft sdk produces lots of errors.Or is there some other library to alows me to reset an adapter, or i had to visual C++ completely to solve this problem?

    Read the article

  • Biggest Delphi nitpicks

    - by Mason Wheeler
    What sort of minor annoyances do you run into using Delphi? I'm not looking for major issues such as "I want a 64-bit compiler." Just little things that can be easily worked around but still should have been implemented better so you don't have to work around them? Marking this CW. I'm more interested in the answers than the points.

    Read the article

  • Subclass not seeing superclass' instance variable

    - by hyn
    I have a situation where my subclass is not seeing the superclass' instance variable x. The ivar is obviously @protected by default, so why do I get a compiler error "x undeclared"? If I make this ivar a property then I can access it by self.x. What's worse is sometimes the error disappears, so something in my code is obviously causing this error but I cannot figure it out.

    Read the article

  • Switch case assembly level code

    - by puffadder
    Hi All, I am programming C on cygwin windows. After having done a bit of C programming and getting comfortable with the language, I wanted to look under the hood and see what the compiler is doing for the code that I write. So I wrote down a code block containing switch case statements and converted them into assembly using: gcc -S foo.c Here is the C source: switch(i) { case 1: { printf("Case 1\n"); break; } case 2: { printf("Case 2\n"); break; } case 3: { printf("Case 3\n"); break; } case 4: { printf("Case 4\n"); break; } case 5: { printf("Case 5\n"); break; } case 6: { printf("Case 6\n"); break; } case 7: { printf("Case 7\n"); break; } case 8: { printf("Case 8\n"); break; } case 9: { printf("Case 9\n"); break; } case 10: { printf("Case 10\n"); break; } default: { printf("Nothing\n"); break; } } Now the resultant assembly for the same is: movl $5, -4(%ebp) cmpl $10, -4(%ebp) ja L13 movl -4(%ebp), %eax sall $2, %eax movl L14(%eax), %eax jmp *%eax .section .rdata,"dr" .align 4 L14: .long L13 .long L3 .long L4 .long L5 .long L6 .long L7 .long L8 .long L9 .long L10 .long L11 .long L12 .text L3: movl $LC0, (%esp) call _printf jmp L2 L4: movl $LC1, (%esp) call _printf jmp L2 L5: movl $LC2, (%esp) call _printf jmp L2 L6: movl $LC3, (%esp) call _printf jmp L2 L7: movl $LC4, (%esp) call _printf jmp L2 L8: movl $LC5, (%esp) call _printf jmp L2 L9: movl $LC6, (%esp) call _printf jmp L2 L10: movl $LC7, (%esp) call _printf jmp L2 L11: movl $LC8, (%esp) call _printf jmp L2 L12: movl $LC9, (%esp) call _printf jmp L2 L13: movl $LC10, (%esp) call _printf L2: Now, in the assembly, the code is first checking the last case (i.e. case 10) first. This is very strange. And then it is copying 'i' into 'eax' and doing things that are beyond me. I have heard that the compiler implements some jump table for switch..case. Is it what this code is doing? Or what is it doing and why? Because in case of less number of cases, the code is pretty similar to that generated for if...else ladder, but when number of cases increases, this unusual-looking implementation is seen. Thanks in advance.

    Read the article

  • Package SWF into an EXE or APP

    - by Jeremy White
    I am trying to adjust my Flash development workflow so that I am using Flash Builder for all of my coding and multiple FLA files for the user interfaces. I will be creating an ActionScript project in Flash Builder and then having each FLA export a SWC into a resources folder. It is important that I retain the ability to export PC and Mac -- EXE and app, respectively -- projector files. Is there a way of doing this with the Flash compiler or any 3rd party tools?

    Read the article

  • What does int argc, char *argv[] mean?

    - by Greg Treleaven
    In many C++ IDE's and compilers, when it generates the main function for you, it looks like this: int main(int argc, char *argv[]) When I code C++ without an IDE, just with a command line compiler, I type: int main() without any parameters. What does this mean, and is it vital to my program?

    Read the article

  • C program to display a jpeg or bmp or pcx file.

    - by Raj
    What is the code in 'c' to display a picture file like jpeg file or bmp file or pcx file. For example the picture may be available in desktop and the program during execution must be given the path of the file as input and should display the image.(If it is in command line,it'll be excellent). Platform:Windows xp Turbo c compiler(or turboc++)

    Read the article

  • Button STILL not working with FLASH CS4

    - by aarontb
    Okay, I have absolutely NO Compiler/Output errors anymore...however, the buttons are still not working? Any suggestions? Replay_btn.addEventListener(MouseEvent.CLICK; replay); function replay(event:MouseEvent):void{ gotoAndPlay(25);} WHAT THE HELL IS WRONG!!! PLEASE LET ME KNOW!!!

    Read the article

  • Flex Action Script timeout issue

    - by user179056
    Hello, Our flex (flare) application keeps timing out when rendering large datasets. Is there anyway to prevent this? we have tried to increase the timeout in the Application tag and the compiler settings. Not mushc success. Any other thoughts? regards Sameer

    Read the article

  • UDK Where did AnimatedCamera go??

    - by Ricket
    I'm porting a game from UT3 to UDK. One of the classes is a subclass of AnimatedCamera. However, AnimatedCamera seems to be missing from the UDK, as the compiler kindly tells me: Error, Superclass AnimatedCamera of class ZCam not found Where did AnimatedCamera go?

    Read the article

  • Switch Statement in C#

    - by pm_2
    Does anyone know if it's possible to include a range in a switch statement (and if so, how)? For example: switch (x) { case 1: //do something break; case 2..8: //do something else break; default: break; } The compiler doesn't seem to like this kind of syntax - neither does it like: case <= 8:

    Read the article

  • Benchmarking Java programs

    - by stefan-ock
    For university, I perform bytecode modifications and analyze their influence on performance of Java programs. Therefore, I need Java programs---in best case used in production---and appropriate benchmarks. For instance, I already got HyperSQL and measure its performance by the benchmark program PolePosition. The Java programs running on a JVM without JIT compiler. Thanks for your help! P.S.: I cannot use programs to benchmark the performance of the JVM or of the Java language itself (such as Wide Finder).

    Read the article

  • Generic overriding tells me this is the same function. Not agree.

    - by serhio
    base class: Class List(Of T) Function Contains(ByVal value As T) As Boolean derived class: Class Bar : List(Of Exception) ' Exception type as example ' Function Contains(Of U)(ByVal value As U) As Boolean compiler tells me that that two are the same, so I need to declare Overloads/new this second function. But I want use U to differentiate the type (one logic) like NullReferenceException, ArgumentNull Exception, etc. but want to leave the base function(no differentiation by type - other logic) as well.

    Read the article

  • Installing gtk and compiling using gcc under windows? [solved]

    - 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.

    Read the article

  • Which is better? Qt Creator or Visual Studio IDE

    - by user249490
    I am currently using Qt Creator 1.3 for my Qt applications. I know it uses jom for make step which is better when we have multi core processors. But besides that what are all the advantages of using both the IDEs? Dis advantages as well? I am using CL compiler though for compiling my applications. Is there any other specific advantages and disadvantages of these IDEs?

    Read the article

  • Freeing memory twice

    - by benjamin button
    Hi, AFAIK, freeing a NULL pointer will result in nothing. I mean nothing is being done by the compiler/no functionality is performed. Still, I do see some statements where people say that one of the scenarios where memory corruption can occur is "freeing memory twice"? Is this still true?

    Read the article

  • C++ adding friend to a template class in order to typecast

    - by user1835359
    I'm currently reading "Effective C++" and there is a chapter that contains code similiar to this: template <typename T> class Num { public: Num(int n) { ... } }; template <typename T> Num<T> operator*(const Num<T>& lhs, const Num<T>& rhs) { ... } Num<int> n = 5 * Num<int>(10); The book says that this won't work (and indeed it doesn't) because you can't expect the compiler to use implicit typecasting to specialize a template. As a soluting it is suggested to use the "friend" syntax to define the function inside the class. //It works template <typename T> class Num { public: Num(int n) { ... } friend Num operator*(const Num& lhs, const Num& rhs) { ... } }; Num<int> n = 5 * Num<int>(10); And the book suggests to use this friend-declaration thing whenever I need implicit conversion to a template class type. And it all seems to make sense. But why can't I get the same example working with a common function, not an operator? template <typename T> class Num { public: Num(int n) { ... } friend void doFoo(const Num& lhs) { ... } }; doFoo(5); This time the compiler complaints that he can't find any 'doFoo' at all. And if i declare the doFoo outside the class, i get the reasonable mismatched types error. Seems like the "friend ..." part is just being ignored. So is there a problem with my understanding? What is the difference between a function and an operator in this case?

    Read the article

< Previous Page | 95 96 97 98 99 100 101 102 103 104 105 106  | Next Page >