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  • Extending the .NET type system so the compiler enforces semantic meaning of primitive values in cert

    - by Drew Noakes
    I'm working with geometry a bit at the moment and am converting a lot between degrees and radians. Unfortunately, both of these are represented by double, so there's compile time warning/error if I try to pass a value in degrees where radians are expected. I believe F# has a compile-time solution for this (called units of measure.) I'd like to do something similar in C#. As another example, imagine a SQL library that accepts various query parameters as strings. It'd be good to have a way of enforcing that only clean strings were allowed to be passed in at runtime, and the only way to get a clean string was to pass through some SQL injection attack preventing logic. The obvious solution is to wrap the double/string/whatever in a new type to give it the type information the compiler needs. I'm curious if anyone has an alternative solution. If you do think wrapping is the only/best way, then please go into some of the downsides of the pattern (and any upsides I haven't mentioned too.) I'm especially concerned about the performance of abstracted primitive numeric types on my calculations at runtime.

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  • What VC++ compiler/linker does when building a C++ project with Managed Extension

    - by ???
    The initial problem is that I tried to rebuild a C++ project with debug symbols and copied it to test machine, The output of the project is external COM server(.exe file). When calling the COM interface function, there's a RPC call failre: COMException(0x800706BE): The remote procedure call failed. According to the COM HRESULT design, if the FACILITY code is 7, it's actually a WIN32 error, and the win32 error code is 0x6BE, which is the above mentioned "remote procedure call failed". All I do is replace the COM server .exe file, the origin file works well. When I checked into the project, I found it's a C++ project with Managed Extension. When I checking the DLL with reflector, it shows there's 2 additional .NET assembly reference. Then I checked the project setting and found nothing about the extra 2 assembly reference. I turned on the show includes option of compiler and verbose library of linker, and try to analyze whether the assembly is indirectly referenced via .h file. I've collect all the .h file and grep all the files with '#using' '#import' and the assembly file itself. There really is a '#using ' in one of the .h file but not-relevant to the referenced assembly. And about the linked .lib library files, only one of the .lib file is a side-product of another managed-extension-enabled C++ project, all others are produced by a pure, traditional C++ project. For the managed-extension-enabled C++ project, I checked the output DLL assembly, it did NOT reference to the 2 assembly. I even try to capture the access of the additional assembly file via sysinternal's filemon and procmon, but the rebuild process does NOT access these file. I'm very confused about the compile and linking process model of a VC++/CLI project, where the additional assembly reference slipped into the final assembly? Thanks in advance for any of your help.

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  • Compiler turning a string& into a basic_string<>&

    - by Shtong
    Hello I'm coming back to C++ after long years spent on other technologies and i'm stuck on some weird behavior when calling some methods taking std::string as parameters : An example of call : LocalNodeConfiguration *LocalNodeConfiguration::ReadFromFile(std::string & path) { // ... throw configuration_file_error(string("Configuration file empty"), path); // ... } When I compile I get this (I cropped file names for readability) : /usr/bin/g++ -g -I/home/shtong/Dev/OmegaNoc/build -I/usr/share/include/boost-1.41.0 -o CMakeFiles/OmegaNocInternals.dir/configuration/localNodeConfiguration.cxx.o -c /home/shtong/Dev/OmegaNoc/source/configuration/localNodeConfiguration.cxx .../localNodeConfiguration.cxx: In static member function ‘static OmegaNoc::LocalNodeConfiguration* OmegaNoc::LocalNodeConfiguration::ReadFromFile(std::string&)’: .../localNodeConfiguration.cxx:72: error: no matching function for call to ‘OmegaNoc::configuration_file_error::configuration_file_error(std::string, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)’ .../configurationManager.hxx:25: note: candidates are: OmegaNoc::configuration_file_error::configuration_file_error(std::string&, std::string&) .../configurationManager.hxx:22: note: OmegaNoc::configuration_file_error::configuration_file_error(const OmegaNoc::configuration_file_error&) So as I understand it, the compiler is considering that my path parameter turned into a basic_string at some point, thus not finding the constructor overload I want to use. But I don't really get why this transformation happened. Some search on the net suggested me to use g++ but I was already using it. So any other advice would be appreciated :) Thanks

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  • __declspec(dllimport) causes compiler crash on MSVC 2010

    - by Zero
    In a *.cpp file, trying to use a third party lib: #define DLL_IMPORT #include <thirdParty.h> // Third party header has code like: // #ifdef DLL_IMPORT // #define DLL_DECL __declspec(dllimport) // fatal error C1001: An internal error has occurred in the compiler. Alternative: #define NO_DLL #include <thirdParty.h> // Third party header has code like: // #elif defined(NO_DLL) // #define DLL_DECL // Compiles fine, but linker errors as can't find DLL functions // I can reproduce results by remove macros and #define all together and manually editing the third party files to have __declspec(dllimport) or not Has anyone come across anything similar, or can hint at the cause? (which is created using CMake). Above is actual example of 2 line *.cpp that crashes so it's narrowed down to something in the #include. The following also work fine: Compile the examples provided by the third party (they provide a *.sln) that use dllimport/export so it doesn't appear to be the fault of the library Compile the third party lib as part of the production project (so dllexport works fine) I've trawled the project settings pages of the two projects to try and spot differences, but have come up blank. Of course, it's possible I'm missing something as those settings pages are not the easiest to navigate. I'll get access to VS2008 in a day or so, so can compare with that. The third party library is MySql++.

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  • C++, overloading std::swap, compiler error, VS 2010

    - by Ian
    I would like to overload std::swap in my template class. In the following code (simplified) #ifndef Point2D_H #define Point2D_H template <class T> class Point2D { protected: T x; T y; public: Point2D () : x ( 0 ), y ( 0 ) {} Point2D( const T &x_, const T &y_ ) : x ( x_ ), y ( y_ ) {} .... public: void swap ( Point2D <T> &p ); }; template <class T> inline void swap ( Point2D <T> &p1, Point2D <T> &p2 ) { p1.swap ( p2 ); } namespace std { template <class T> inline void swap ( Point2D <T> &p1, Point2D <T> &p2 ) { p1.swap ( p2 ); } } template <class T> void Point2D <T>::swap ( Point2D <T> &p ) { using (std::swap); swap ( x, p.x ); swap ( y, p.y ); } #endif there is a compiler error (only in VS 2010): error C2668: 'std::swap' : ambiguous call to overloaded I do not know why, std::swap should be overoaded... Using g ++ code works perfectly. Without templates (i.e. Point2D is not a template class) this code also works.. Thanks for your help.

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  • Fast compiler error messages in Eclipse

    - by Chris Conway
    As a new Eclipse user, I am constantly annoyed by how long it takes compiler error messages to display. This is mostly only a problem for long errors that don't fit in the status bar or the "Problems" tab. But I get enough long errors in Java—especially with generics—that this is a nagging issue. (Note: The correct answer to this question is not "get better at using generics." ;-) The ways I have found to display an error are: Press Ctrl+. or execute the command "Next Annotation". The next error is highlighted and its associated message appears in the status bar (if it is short enough). The error is also highlighted in the "Problems" tab, if it is open, but the tab is not automatically brought to the top. Hover the mouse over the error. After a noticeable lag, the error message appears as a "tool tip", along with any associated "Quick Fixes." Hover the mouse over the error icon on the left side of the editing pane. After a noticeable lag, all of the error messages for that line appear as a "tool tip." Clicking on the icon brings up "Quick Fixes." What I would like is for Ctrl+. to automatically and instantly bring up the complete error message (I don't care where). Is this a configurable option? [UPDATE] @asterite's "Ctrl+. F2" is almost it. How do I make "Next Annotation, then Show Tooltip Description" a macro bound to a single keystroke?

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  • c++ Multiple Inheritance - Compiler modifying my pointers

    - by Bob
    If I run the following code, I get different addresses printed. Why? class Base1 { int x; }; class Base2 { int y; }; class Derived : public Base1, public Base2 { }; union U { Base2* b; Derived* d; U(Base2* b2) : b(b) {} }; int main() { Derived* d = new Derived; cout << d << "\n"; cout << U(d).d << "\n"; return 0; } Even more fun is if you repeatedly go in and out of the union the address keeps incrementing by 4, like this int main() { Derived* d = new Derived; cout << d << "\n"; d = U(d).d; cout << d << "\n"; d = U(d).d; cout << d << "\n"; return 0; } If the union is modified like this, then the problem goes away union U { void* v; Base2* b; Derived* d; U(void* v) : v(v) {} }; Also, if either base class is made empty, the problem goes away. Is this a compiler bug? I want it to leave my pointers the hell alone.

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  • Portable C Compiler (pcc) with GTK+ in Code::Blocks

    - by CMPITG
    I had some problems when trying to compile a GTK+ program with Portable C Compiler (pcc) using Code::Blocks in Windows. When I tried to build the default GTK+ project in Code::Blocks, I get these errors: -------------- Build: Debug in cb-temp2 --------------- Compiling: main.c C:\CMPITG\gtk\include\glib-2.0/glib/gutils.h, line 423: parameter 'glib_major_version' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gutils.h, line 424: function declaration in bad context C:\CMPITG\gtk\include\glib-2.0/glib/gutils.h, line 424: parameter '__declspec' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gutils.h, line 424: parse error C:\CMPITG\gtk\include\glib-2.0/glib/gutils.h, line 425: redeclaration of __declspec C:\CMPITG\gtk\include\glib-2.0/glib/gutils.h, line 425: parameter 'glib_micro_version' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gutils.h, line 426: function declaration in bad context C:\CMPITG\gtk\include\glib-2.0/glib/gutils.h, line 426: parameter '__declspec' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gutils.h, line 426: parse error C:\CMPITG\gtk\include\glib-2.0/glib/gutils.h, line 427: redeclaration of __declspec C:\CMPITG\gtk\include\glib-2.0/glib/gutils.h, line 427: parameter 'glib_binary_age' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gutils.h, line 431: parameter 'glib_check_version' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gatomic.h, line 42: parameter 'g_atomic_int_exchange_and_add' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gatomic.h, line 44: parameter 'g_atomic_int_add' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gatomic.h, line 47: parameter 'g_atomic_int_compare_and_exchange' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gatomic.h, line 50: parameter 'g_atomic_pointer_compare_and_exchange' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gatomic.h, line 52: parameter 'g_atomic_int_get' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gatomic.h, line 54: parameter 'g_atomic_int_set' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gatomic.h, line 55: parameter 'g_atomic_pointer_get' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gatomic.h, line 57: parameter 'g_atomic_pointer_set' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gthread.h, line 44: parameter 'g_thread_error_quark' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gthread.h, line 50: parameter 'GThreadError' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gthread.h, line 52: parameter 'GThreadFunc' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gthread.h, line 60: parameter 'GThreadPriority' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gthread.h, line 62: parameter 'GThread' not defined C:\CMPITG\gtk\include\glib-2.0/glib/gthread.h, line 66: parse error C:\CMPITG\gtk\include\glib-2.0/glib/gthread.h, line 66: invalid function definition C:\CMPITG\gtk\include\glib-2.0/glib/gthread.h, line 66: function illegal in structure or union C:\CMPITG\gtk\include\glib-2.0/glib/gthread.h, line 66: invalid function definition C:\CMPITG\gtk\include\glib-2.0/glib/gthread.h, line 66: function illegal in structure or union C:\CMPITG\gtk\include\glib-2.0/glib/gthread.h, line 67: cannot recover from earlier errors: goodbye! Process terminated with status 1 (0 minutes, 1 seconds) 0 errors, 0 warnings I have successfully compiled the same project with gcc and now I'm still not able to compile it with pcc. Does anyone know how to solve it?

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  • How to use Google's Closure to compile JavaScript

    - by Ted
    Google just released Closure, which is a compiler to minify JavaScript. On the product site, it says "The Closure Compiler has also been integrated with Page Speed". How do I use Page Speed to compile my web pages JavaScript with Closure? (Or, is there a web site that I can simply paste in my JavaScript to have closure minify it?

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  • Avoid compiling when using Decimal.Round() method (C#/CF)

    - by Christian Almeida
    Is there a way to tell to VS2005 to get compiler error when using "some defined" method? It probably sounds strange, but I do not want to compile when using Decimal.Round(). Reason: CF does not round by "awayfromzero", so I created a method to do this job. But sometimes I (and team) forget that is not to use Decimal.Round. So I'd like to get a compiler error when using it.

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  • Example compilers

    - by saf
    I'm searching for the source code of a compiler capable of creating Win32 programs from an input program in a programming language (It doesn't matter which, maybe the simpler the better) Yet I can't find anything right for me and huge compilers like GCC make me extremely confused as they have so many features that I don't know where to start. Is there an OpenSource Win32 micro-compiler for some programming language out there I could take a look at?

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  • maven-compiler-plugin exclude

    - by easyrider
    Hi, I have a following Problem. I would like to exclude some .java files (*/jsfunit/.java) during test-compile phace and on the other side i would like to include them during compile phace (id i start tomact with tomcat:run goal) My pom.xml <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <configuration> <source>1.6</source> <target>1.6</target> <!-- <excludes> <exclude>**/*JSFIntegration*.java</exclude> </excludes> --> </configuration> <executions> <!-- <execution> <id>default-compile</id> <phase>compile</phase> <goals> <goal>compile</goal> </goals> <configuration> <includes> <include>**/jsfunit/*.java</include> </includes> </configuration> </execution>--> <execution> <id>default-testCompile</id> <phase>test-compile</phase> <configuration> <excludes> <exclude>**/jsfunit/*.java</exclude> </excludes> </configuration> <goals> <goal>testCompile</goal> </goals> </execution> </executions> </plugin> But it does not work : exclude in default-testCompile execution does not filter these classes. If i remove the comments then all classes matched */jsfunit/.java would be compiled but only if i touch them! Please help! Thanx in advance

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  • What programming language is FogBugz written in?

    - by Earlz
    From what I've read it appears that FogBugz was originally written in VBScript. Now apparently they use their own custom compiler and language that will translate the source code to more "accessible" languages such as PHP and (I think) C#. Is there a name for this language? What does a hello world look like in it? Is there any hope of seeing this compiler released to the public?

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  • ASP.NET Convert to Web App question

    - by mattgcon
    The following web control will not convert for some reason (add designer and cs pages). I am getting a page directive is missing error What is wrong with the code that is causing it to not convert? <%@ Control Language="C#" AutoEventWireup="true" %> <%@ Register TagPrefix="ipam" TagName="tnavbar" src="~/controls/tnavbar.ascx" %> <script language="C#" runat="server"> string strCurrent = ""; string strDepth = ""; public string Current { get { return strCurrent; } set { strCurrent = value; } } public string Depth { get { return strDepth; } set { strDepth = value; } } void Page_Load(Object sender, EventArgs e) { idTnavbar.Current = strCurrent; idTnavbar.Item1Link = strDepth + idTnavbar.Item1Link; idTnavbar.Item2Link = strDepth + idTnavbar.Item2Link; idTnavbar.Item3Link = strDepth + idTnavbar.Item3Link; idTnavbar.Item4Link = strDepth + idTnavbar.Item4Link; idTnavbar.Item5Link = strDepth + idTnavbar.Item5Link; idTnavbar.Item6Link = strDepth + idTnavbar.Item6Link; idTnavbar.Item7Link = strDepth + idTnavbar.Item7Link; } </script> <ipam:tnavbar id="idTnavbar" Item1="2000 -- 2001" Item1Link="2000_--_2001.aspx" Item2="2001 -- 2002" Item2Link="2001_--_2002.aspx" Item3="2002 -- 2003" Item3Link="2002_--_2003.aspx" Item4="2003 -- 2004" Item4Link="2003_--_2004.aspx" Item5="2004 -- 2005" Item5Link="2004_--_2005.aspx" Item6="2005 -- 2006" Item6Link="2005_--_2006.aspx" Item7="2006 -- 2007" Item7Link="2006_--_2007.aspx" runat="server" /> Please help, if I can solve this issue many more pages will be fixed to.

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  • What purpose does “using” serve when used the following way

    - by user287745
    What purpose does “using” serve when used the following way:- ONE EXAMPLE IS THIS, (AN ANSWERER- @richj - USED THIS CODE TO SOLVE A PROBLEM THANKS) private Method(SqlConnection connection) { using (SqlTransaction transaction = connection.BeginTransaction()) { try { // Use the connection here .... transaction.Commit(); } catch { transaction.Rollback(); throw; } } } OTHER EXAMPLE I FOUND WHILE READING ON MICROSOFT SUPPORT SITE public static void ShowSqlException(string connectionString) { string queryString = "EXECUTE NonExistantStoredProcedure"; StringBuilder errorMessages = new StringBuilder(); using (SqlConnection connection = new SqlConnection(connectionString)) { SqlCommand command = new SqlCommand(queryString, connection); try { command.Connection.Open(); command.ExecuteNonQuery(); } catch (SqlException ex) { for (int i = 0; i < ex.Errors.Count; i++) { errorMessages.Append("Index #" + i + "\n" + "Message: " + ex.Errors[i].Message + "\n" + "LineNumber: " + ex.Errors[i].LineNumber + "\n" + "Source: " + ex.Errors[i].Source + "\n" + "Procedure: " + ex.Errors[i].Procedure + "\n"); } Console.WriteLine(errorMessages.ToString()); } } } I AM doing at top of page as using system.data.sqlclient etc so why this using thing in middle of code, What if I omit it (I know the code will work) but what functionality will I be losing

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  • missing a using directive or an assembly reference

    - by cire1507
    I'm in the process of writing a small asp.net mvc application that is using the northwind.mdf. When building the solution I get this error: Error 1 The type or namespace name 'Order' could not be found (are you missing a using directive or an assembly reference?) Order is a table in the northwind database. any help is most appreciated.

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  • #ifdef with gfortran 77

    - by ccook
    I am using gfortran to compile FORTRAN 77 and would like to have DEBUG build options by using the preprocessor directive #ifdef. However, when I use them I get compile time warnings "Illegal preprocessor directive". Is it possible to have this functionality without deviating from the standard toolchain?

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  • Moving Git Projects between computers

    - by 01
    I have a project that i use at two places(i dont use git server). When i copy the project at second place i have to check-in all the files(but they have not changed), git shows me for example @@ -1,8 +1,8 @@ -#Sat Mar 06 19:39:27 CET 2010 -eclipse.preferences.version=1 -org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled -org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.6 -org.eclipse.jdt.core.compiler.compliance=1.6 -org.eclipse.jdt.core.compiler.problem.assertIdentifier=error -org.eclipse.jdt.core.compiler.problem.enumIdentifier=error -org.eclipse.jdt.core.compiler.source=1.6 +#Sat Mar 06 19:39:27 CET 2010 +eclipse.preferences.version=1 +org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled +org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.6 +org.eclipse.jdt.core.compiler.compliance=1.6 +org.eclipse.jdt.core.compiler.problem.assertIdentifier=error +org.eclipse.jdt.core.compiler.problem.enumIdentifier=error +org.eclipse.jdt.core.compiler.source=1.6 i did at both places the command git config --global core.autocrlf false but it doesnt help with this problem

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  • C Preprocessor: #define in C... advice

    - by vikramtheone
    Hi Guys, I'm making a big C project and I have never come across a situation like this before so, I need your advice. What is your opinion? Is it okay to have the constants defined within conditional preprocessors like I have done below or you advise me to do this some other way? Any drawbacks if I do it this way? Regards Vikram #define NUM_OCTAVES_4 //#define NUM_OCTAVES_5 #ifdef NUM_OCTAVES_4 #define OCTAVES 4 const unsigned char borders [4] = {11, 26, 50, 98}; #elif NUM_OCTAVES_5 #define OCTAVES 5 const unsigned char borders [5] = {11, 26, 50, 98, 194}; #endif

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  • #include in C# (conditional compilation)

    - by HeavyWave
    Is it possible in C# to set such a condition that if the condition is true - compile one file;If condition is false - compile another file? Sort of like #ifdef DEBUG #include Class1.cs #else #include Class2.cs #endif Or possibly set it up in project properties.

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