what is missing here?
public final class accounts { public: static table_user user; } public final class table_user { private: static uint32 dummy1; static string dummy2; static DateTime dummy3; static ubyte dummy4; public: static @property auto user_id_t() { return typeof(dummy1); } static @property auto name_t() { return typeof(dummy2); } static @property auto alias_t() { return typeof(dummy2);} static @property auto pers_email_t() { return typeof(dummy2); } static @property auto corp_email_t() { return typeof(dummy2); } static @property auto password_t() { return typeof(dummy2); } static @property auto last_login_t() { return typeof(dummy3); } static @property auto active_t() { return typeof(dummy4); } static @property auto id_lang_t() { return typeof(dummy4); } static @property auto function_t() { return typeof(dummy4); } static @property auto register_date_t() { return typeof(dummy3); } } for every property it throws me an error at compile time: type ($) has no value. I'm trying to do a wrap of a database so when getting a resultset using mysql-native I can do result.front()[0].get!(accounts.user.user_it_t); si it's more readable.
Re: what is missing here?
On 03.05.2016 18:03, Jonathan Villa wrote: public final class accounts { public: static table_user user; } public final class table_user { private: static uint32 dummy1; static string dummy2; static DateTime dummy3; static ubyte dummy4; public: static @property auto user_id_t() { return typeof(dummy1); } static @property auto name_t() { return typeof(dummy2); } static @property auto alias_t() { return typeof(dummy2);} static @property auto pers_email_t() { return typeof(dummy2); } static @property auto corp_email_t() { return typeof(dummy2); } static @property auto password_t() { return typeof(dummy2); } static @property auto last_login_t() { return typeof(dummy3); } static @property auto active_t() { return typeof(dummy4); } static @property auto id_lang_t() { return typeof(dummy4); } static @property auto function_t() { return typeof(dummy4); } static @property auto register_date_t() { return typeof(dummy3); } } for every property it throws me an error at compile time: type ($) has no value. I'm trying to do a wrap of a database so when getting a resultset using mysql-native I can do result.front()[0].get!(accounts.user.user_it_t); si it's more readable. Types are not values. You cannot return a type from a function. Use aliases instead: alias user_id_t = typeof(dummy1); alias name_t = typeof(dummy2); /* ... etc ... */
Re: what is missing here?
On Tuesday, 3 May 2016 at 16:13:07 UTC, ag0aep6g wrote: On 03.05.2016 18:03, Jonathan Villa wrote: Types are not values. You cannot return a type from a function. Use aliases instead: alias user_id_t = typeof(dummy1); alias name_t = typeof(dummy2); /* ... etc ... */ Thank you, I thought alias was just allowed to be declared outside, but declaring them inside as public it now behaves like I want.
Re: Strange stack variable corruption error after calling extern(C) function
On Tuesday, 3 May 2016 at 12:48:37 UTC, Benjamin Thaut wrote: It seems that one of the fmod functions you declared is not correct. Either the fmod api is not using the c calling convention or you made a mistake when declaring the paramters of the fmod functions. You should double check that the functions match the fmod headers. I see, thanks. Double checking the original headers, I see the function is defined as: FMOD_RESULT F_API FMOD_System_CreateSound (FMOD_SYSTEM *system, const char *name_or_data, FMOD_MODE mode, FMOD_CREATESOUNDEXINFO *exinfo, FMOD_SOUND **sound); F_API seems to be defined as follows: ... #elif defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(_WIN64) #define F_STDCALL _stdcall #define F_DECLSPEC __declspec #define F_DLLEXPORT ( dllexport ) ... #ifdef DLL_EXPORTS #define F_API F_DECLSPEC F_DLLEXPORT F_STDCALL #else #define F_API F_STDCALL #endif I tried going by the information suggested on this page: http://wiki.dlang.org/D_binding_for_C#cdecl.2C_pascal.2C_stdcall but if I declare the function, in D, as: extern(Windows) FMOD_RESULT FMOD_System_CreateSound (FMOD_SYSTEM *system, const char *name_or_data, FMOD_MODE mode, FMOD_CREATESOUNDEXINFO *exinfo, FMOD_SOUND **sound); it fails to link with "Error 42: Symbol Undefined _FMOD_System_CreateSound@20". With extern(C) it compiles and runs but the problem from above persists.
Re: constructed variadic call
On Monday, 2 May 2016 at 18:56:59 UTC, Stefan Koch wrote: On Monday, 2 May 2016 at 18:22:52 UTC, Erik Smith wrote: Is there way to construct an "argument pack" from a non-static array (like the switch below)? I need to transport a variadic call through a void*. switch (a.length) { case 1: foo(a[1]); break; case 2: foo(a[1], a[2]); break; case 3: foo(a[1], a[2], a[3]); break; ... } Yes there is. Using a string mixin. I'm not sure how to apply mixins here because they require compile time evaluation and a.length is runtime. Ideas? erik
what is equivalent to template template
C++ has template templates. I'm not sure how to achieve the same effect where (in example below) the template function myVariadic is passed to another function. void myVaridatic(A...)(A a) {} static void call(alias F,A...)(F f,A a) { f(a); } void foo() { call(myVaridatic,1,2,3); }
Re: constructed variadic call
On Monday, 2 May 2016 at 18:22:52 UTC, Erik Smith wrote: Is there way to construct an "argument pack" from a non-static array (like the switch below)? I need to transport a variadic call through a void*. switch (a.length) { case 1: foo(a[1]); break; case 2: foo(a[1], a[2]); break; case 3: foo(a[1], a[2], a[3]); break; ... } I don't think it's possible to call a vararg function whose number of arguments is only known at runtime, for the same reasons it is impossible in C [1]. Your switch statement is probably the best you can do, other than rewriting the API to not use varargs (which, depending on what the function is doing, I would recommend). You can possibly use string mixins or static foreach to avoid repeating the case clauses. [1] Populating a va_list: http://stackoverflow.com/questions/988290/populating-a-va-list
Re: what is equivalent to template template
On 03.05.2016 23:31, Erik Smith wrote: void myVaridatic(A...)(A a) {} Aside: I think it's "variadic", not "varidatic". static void call(alias F,A...)(F f,A a) { static void call(alias f, A...)(A a) { f(a); } void foo() { call(myVaridatic,1,2,3); call!myVaridatic(1, 2, 3); }
Re: what is equivalent to template template
On Tuesday, 3 May 2016 at 21:31:35 UTC, Erik Smith wrote: C++ has template templates. I'm not sure how to achieve the same effect where (in example below) the template function myVariadic is passed to another function. void myVaridatic(A...)(A a) {} static void call(alias F,A...)(F f,A a) { f(a); } void foo() { call(myVaridatic,1,2,3); } You're close. An `alias` template parameter can be any symbol, including a template. But you can't pass in a template as a runtime parameter, so having `F f` in your parameters list is wrong (there's nothing to pass anyway; you already have the template, which is F). static void call(alias F, A...)(A a) { F(a); } Then instantiate and call the `call` function with the template you want: call!myVariadict(1,2,3);
Re: constructed variadic call
I don't think it's possible to call a vararg function whose number of arguments is only known at runtime, for the same reasons it is impossible in C [1]. Your switch statement is probably the best you can do, other than rewriting the API to not use varargs (which, depending on what the function is doing, I would recommend). You can possibly use string mixins or static foreach to avoid repeating the case clauses. [1] Populating a va_list: http://stackoverflow.com/questions/988290/populating-a-va-list That was fast :). The generation idea helps a little - thanks. It works though and I can't use va_list in this case. erik
Re: what is equivalent to template template
You're close. An `alias` template parameter can be any symbol, including a template. But you can't pass in a template as a runtime parameter, so having `F f` in your parameters list is wrong (there's nothing to pass anyway; you already have the template, which is F). static void call(alias F, A...)(A a) { F(a); } Then instantiate and call the `call` function with the template you want: call!myVariadict(1,2,3); Works. Thanks!
undefined identifier 'size_t'
I have run into an issue compiling with dmd (version 2.071.0), it seems that the 'size_t' alias isn't resolving properly. I was wondering if someone has run into this before and if this is a bug or something I'm doing wrong? My call to dmd is: ..dmd2\windows\bin\dmd.exe -run hello.d -de -w -unittest Here is a sample program: import std.stdio; void main () { stdout.writeln("Hello World!"); } And the ouput: ..dmd2\windows\bin\..\..\src\druntime\import\core\stdc\time.d(111): Error: undefined identifier 'size_t' ..dmd2\windows\bin\..\..\src\druntime\import\core\stdc\time.d(111): Error: undefined identifier 'size_t' ..dmd2\windows\bin\..\..\src\druntime\import\core\stdc\wchar_.d(60): Error: undefined identifier 'size_t' ..dmd2\windows\bin\..\..\src\druntime\import\core\stdc\wchar_.d(68): Error: undefined identifier 'size_t' ..dmd2\windows\bin\..\..\src\druntime\import\core\stdc\wchar_.d(142): Error: undefined identifier 'size_t' ..dmd2\windows\bin\..\..\src\druntime\import\core\stdc\wchar_.d(146): Error: undefined identifier 'size_t' ..dmd2\windows\bin\..\..\src\druntime\import\core\stdc\wchar_.d(152): Error: undefined identifier 'size_t' ..dmd2\windows\bin\..\..\src\druntime\import\core\stdc\wchar_.d(154): Error: undefined identifier 'size_t' ..dmd2\windows\bin\..\..\src\druntime\import\core\stdc\wchar_.d(154): Error: undefined identifier 'size_t' Thanks
Re: undefined identifier 'size_t'
Is there a file called object.d in your current directory?
Re: undefined identifier 'size_t'
On Wednesday, 4 May 2016 at 01:44:31 UTC, Adam D. Ruppe wrote: Is there a file called object.d in your current directory? Not anymore, Thanks for pointing that out
Re: Setting a list of values
On Sunday, 1 May 2016 at 05:42:00 UTC, Ali Çehreli wrote: On 04/30/2016 10:05 PM, Joel wrote: > This has no effect: > _bars.each!(a => { a._plots.fillColor = Color(255, 180, 0); }); This is a common issue especially for people who know lambdas from other languages. :) Your lambda does not do any work. Rather, your lambda returns another lambda, which is promptly ignored: import std.stdio; import std.algorithm; void main() { auto arr = [ 1, 2 ]; arr.each!(a => { writeln(a); }); // returns lambda for each a } The lambda that 'each' takes above is "given a, produce this lambda". . To do the intended work, you need to remove the curly braces (and the semicolon): arr.each!(a => writeln(a)); Or, you could insert empty () to call the returned lambda but that would completely be extra work in this case: arr.each!(a => { writeln(a); }()); Ali This seems to work the best: arr.each!(a => { writeln(a); }());
Code example for function/delegate as template argument ?
Hello, I failed to find some code example for a template class/struct that accept a function/delegate as template argument. All examples I could find use simple value types like int or double. I piggy bag another question. Defining a function/delegate as function argument is shown in examples. What I could not find is how would I pass an object instance with a method to call ? In C++ we use std::bind. How do we do that in D ?
Re: Stacktraces in static constructors
On Tuesday, 3 May 2016 at 12:31:10 UTC, Benjamin Thaut wrote: I assume this is on windows? Yes its a known issue (I know No, the problem occurs on my Linux aswell.
Re: How can I save a class use the RedBlackTree?
On 5/3/16 5:10 AM, Dsby wrote: this is the test Code: import std.container.rbtree; import std.stdio; class TClass { int i; } void main() { RedBlackTree!(TClass) list = new RedBlackTree!(TClass)(); auto t = new TClass(); list.insert(t); writeln("The rbtree length is ",list.length()); list.removeKey(t); writeln("The rbtree length is ",list.length()); } and thisis erro : /usr/include/dlang/dmd-2.071.0/phobos/std/functional.d-mixin-206(206): Error: mutable method object.Object.opCmp is not callable using a inout object /usr/include/dlang/dmd-2.071.0/phobos/std/container/rbtree.d(871): Error: template instance std.functional.binaryFun!("a < b", "a", "b").binaryFun!(inout(TClass), TClass) error instantiating rbtree.d(11):instantiated from here: RedBlackTree!(TClass, "a < b", false) /usr/include/dlang/dmd-2.071.0/phobos/std/functional.d-mixin-206(206): Error: function object.Object.opCmp (Object o) is not callable using argument types (inout(TClass)) /usr/include/dlang/dmd-2.071.0/phobos/std/container/rbtree.d(873): Error: template instance std.functional.binaryFun!("a < b", "a", "b").binaryFun!(TClass, inout(TClass)) error instantiating rbtree.d(11):instantiated from here: RedBlackTree!(TClass, "a < b", false) bleh, Object.opCmp only works with mutable objects. Which means RedBlackTree cannot work with objects because it uses inout to ensure your objects are not modified (since 2.068) It doesn't work with const or immutable either, the only possible solution is to go back to mutable only. So annoying, we need to fix Object.opCmp, or using const/immutable comparisons with objects doesn't work. -Steve
Stacktraces in static constructors
AFAICT, stacktraces are not emitted with debug information when errors occurr in static module constructors. Is this a know bug? This is a big problem for me because, in my application, I've realized unittests as functions called from within static shared module constructors to elide the problem of unittests being enabled recursively, which slows down iterative compilation time enormously.
Re: Stacktraces in static constructors
On Tuesday, 3 May 2016 at 10:48:51 UTC, Nordlöw wrote: AFAICT, stacktraces are not emitted with debug information when Should be static shared module constructors. errors occur in static module constructors. Is this a know bug? My stacktraces contain no information of the call stack so it's very very tedious work to find the reason for a failing unittest.
Strange stack variable corruption error after calling extern(C) function
Hello, I've been encountering a strange problem that seems to occur after calling some external C functions. I've been working on a program that incorporates the FMOD C API for playing sound, with a simple D binding based off the C headers, and actually everything works more or less fine, I've had working sound in my program for a few months now. However I recently started noticing some strange behavior, currently using DMD v2.070.2 (haven't tried v2.071 yet, will soon). I can't post the entire program but I'll include the relevant code, I might try to make a small working compilable sample if this isn't enough information. // fmod/c/fmod.d: // Adapted from C headers extern(C): struct FMOD_SYSTEM; struct FMOD_SOUND; enum FMOD_RESULT : int { ... } enum FMOD_MODE : uint { ... } FMOD_RESULT FMOD_System_CreateSound(FMOD_SYSTEM *system, const char *name_or_data, FMOD_MODE mode, FMOD_CREATESOUNDEXINFO *exinfo, FMOD_SOUND **sound); // sound.d: class Sound { static immutable string pathPrefix = "data/sound/"; enum FMOD_MODE mode = FMOD_MODE.FMOD_LOOP_OFF | FMOD_MODE.FMOD_3D | FMOD_MODE.FMOD_3D_HEADRELATIVE | FMOD_MODE.FMOD_3D_LINEARSQUAREROLLOFF; FMOD_SOUND *snd; FMOD_CHANNEL *channel; string name; void load() { string fullpath = pathPrefix ~ name ~ ".wav"; writefln("loading sound before: <%s> <%s> [%08x] <%s>", pathPrefix, name, fullpath.ptr, fullpath); FMOD_System_CreateSound(system, fullpath.toStringz, mode, null, &snd); writefln("A loading sound after: <%s> <%s> [%08x] <%s>", pathPrefix, name, fullpath.ptr, fullpath); writefln("B loading sound after: <%s> <%s> [%08x] <%s>", pathPrefix, name, fullpath.ptr, fullpath); if (1) { writefln("C loading sound after: <%s> <%s> [%08x] <%s>", pathPrefix, name, fullpath.ptr, fullpath); } } } // Output: loading sound before: [04368a40] A loading sound after: [04368a40] B loading sound after: [04368a40] C loading sound after: [005df255] loading sound after: <%s> <%s> [%08x] <%s>> As you can see I concatenate the path, filename, and extension strings, simple enough, then pass the result of .toStringz to the function. What happens next is the bizarre behavior to the fullstring variable: Everything is fine until the program enters the if check, then for some reason the value of fullpath changes to be that of the string literal being passed to writefln(). If I try to do something else such as save the value of fullpath as a class member variable first, I get some other problem like object.Error@(0): Access Violation when it comes time to print the string. The sound itself still plays fine, but something is getting corrupted by something, somewhere, and I'm completely at a loss as to understand what's going on. Does anyone have any advice on what's happening here?
Re: How can I save a class use the RedBlackTree?
On Tue, 3 May 2016 11:37:13 +0200 Steven Schveighoffer via Digitalmars-d-learn wrote: > bleh, Object.opCmp only works with mutable objects. Which means > RedBlackTree cannot work with objects because it uses inout to ensure > your objects are not modified (since 2.068) > > It doesn't work with const or immutable either, the only possible > solution is to go back to mutable only. > > So annoying, we need to fix Object.opCmp, or using const/immutable > comparisons with objects doesn't work. Hopefully someday... https://issues.dlang.org/show_bug.cgi?id=9770 - Jonathan M Davis
Re: Stacktraces in static constructors
On Tuesday, 3 May 2016 at 10:52:20 UTC, Nordlöw wrote: On Tuesday, 3 May 2016 at 10:48:51 UTC, Nordlöw wrote: AFAICT, stacktraces are not emitted with debug information when Should be static shared module constructors. errors occur in static module constructors. Is this a know bug? My stacktraces contain no information of the call stack so it's very very tedious work to find the reason for a failing unittest. I assume this is on windows? Yes its a known issue (I know about it). I Don't know if its filed though. As a workaround you can import "core.sys.windows.stacktrace" into each of your modules. That will force the module system to initialize the stacktracing code before the module ctors. The underlying issue is that the module system does not know about the implicit dependeny of every module on the stacktracing module. Kind Regards Benjamin Thaut
Re: Strange stack variable corruption error after calling extern(C) function
On Tuesday, 3 May 2016 at 11:32:31 UTC, cc wrote: Hello, I've been encountering a strange problem that seems to occur after calling some external C functions. I've been working on a program that incorporates the FMOD C API for playing sound, with a simple D binding based off the C headers, and actually everything works more or less fine, I've had working sound in my program for a few months now. However I recently started noticing some strange behavior, currently using DMD v2.070.2 (haven't tried v2.071 yet, will soon). I can't post the entire program but I'll include the relevant code, I might try to make a small working compilable sample if this isn't enough information. [...] It seems that one of the fmod functions you declared is not correct. Either the fmod api is not using the c calling convention or you made a mistake when declaring the paramters of the fmod functions. You should double check that the functions match the fmod headers. Kind Regards Benjamin Thaut
Re: How can I save a class use the RedBlackTree?
On Tuesday, 3 May 2016 at 12:12:04 UTC, Jonathan M Davis wrote: On Tue, 3 May 2016 11:37:13 +0200 Steven Schveighoffer via Digitalmars-d-learn wrote: bleh, Object.opCmp only works with mutable objects. Which means RedBlackTree cannot work with objects because it uses inout to ensure your objects are not modified (since 2.068) It doesn't work with const or immutable either, the only possible solution is to go back to mutable only. So annoying, we need to fix Object.opCmp, or using const/immutable comparisons with objects doesn't work. Hopefully someday... https://issues.dlang.org/show_bug.cgi?id=9770 - Jonathan M Davis What's stopping us right now from making opCmp a free function in object.d?
struct cannot deduce function from argument types
The following code does not compile and I don't understand why. import std.stdio; class Data { string m = "Hello world !"; } struct IdxElem(D) { bool inUse; D data; } IdxElem!Data[string] idx; void main() { idx["test1"] = IdxElem(true, new Data); idx["test2"] = IdxElem(false, new Data); writeln(idx["test2"].data); writeln("Hello world!"); } This is the error message I get with DMD64 D Compiler v2.068.2 source/app.d(20,27): Error: struct app.IdxElem cannot deduce function from argument types !()(bool, Data), candidates are: source/app.d(9,1):app.IdxElem(D) source/app.d(21,27): Error: struct app.IdxElem cannot deduce function from argument types !()(bool, Data), candidates are: source/app.d(9,1):app.IdxElem(D) dmd failed with exit code 1. I get the same error even if I add a constructor to IdxElem that sets the member variables with its two arguments.
Re: struct cannot deduce function from argument types
Oops! Stupid of me. There were three bugs in the code. Correct code is as follow: import std.stdio; class Data { string m = "Hello world !"; } struct IdxElem(D) { bool inUse; D data; } IdxElem!(Data)[string] idx; void main() { idx["test1"] = IdxElem!Data(true, new Data); idx["test2"] = IdxElem!Data(false, new Data); writeln(idx["test2"].data.m); writeln("Hello world!"); }
Re: DlangUI FileDialog not working
On Tuesday, 3 May 2016 at 06:14:25 UTC, stunaep wrote: FileDialog is showing a blank white window for me. Only tested on windows 7 so far, but if I run dmledit, the filedialog on there works fine. It's weird because I am using almost exactly the same code. Try fetch recent dlangui version (dub upgrade --force-remove). I fixed this issue last week. (There was a problem with sharing of OpenGL context between windows). Difference in dmledit is probably due to different dlangui configuration selected - it uses `minimal` configuration - w/o OpenGL acceleration.
Re: ubyte[] -> immutable(ubyte)[]
On Friday, 10 September 2010 at 15:15:38 UTC, Andrej Mitrovic wrote: Yeah, one would think the destination is on the left (just like the standard C way of doing it), but it's not. I checked it in the docs and the source. And idup works, thanks. Kagamin Wrote: Andrej Mitrovic Wrote: > foreach (ubyte[] buffer; stdin.byChunk(bufferSize)) > { > immutable(ubyte)[] copy_buffer; > copy(buffer, copy_buffer); > > writeln(copy_buffer); // writes nothing > > send(tid, copy_buffer); > } Isn't destination the left argument? Why you don't use send(tid, buffer.idup); ? Hi Andrei/All, Request your help, I am trying the program written by you with few changes such as the example program read the input from stdin and prints the data to stdout, but my program reads the input from the file(readfile.txt) and writes the output to another file(writefile.txt), and I am getting the below errors while compiling Testing: Read a file(readfile.txt : Contain 20,000 lines) by chunk into a buffer(read buffer) Pass the buffered data to an output buffer(write buffer) and then write the output buffer to a to another file(writefile.txt). Error: [root@localhost DProjects]# dmd readwriteb.d readwriteb.d(7): Error: cannot implicitly convert expression (__aggr2859.front()) of type ubyte[] to immutable(ubyte)[] readwriteb.d(15): Error: cannot implicitly convert expression (receiveOnly()) of type immutable(ubyte)[] to std.outbuffer.OutBuffer [root@localhost DProjects]# Version: DMD64 D Compiler v2.071.0 Code: import std.algorithm, std.concurrency, std.stdio, std.outbuffer, std.file; void main() { enum bufferSize = 1024 * 100; auto file = File("readfile.txt", "r"); auto tid = spawn(&fileWriter); foreach (immutable(ubyte)[] buffer; file.byChunk(bufferSize)) { send(tid, buffer); } } void fileWriter() { auto wbuf = new OutBuffer(); for (;;) { wbuf = receiveOnly!(immutable(ubyte)[])(); write("writefile.txt", wbuf); } } After few changes as below I was able to compile, but when i run the program there is no data in the writefile.txt import std.algorithm, std.concurrency, std.stdio, std.file; void main() { enum bufferSize = 1024 * 100; auto file = File("readfile.txt", "r"); auto tid = spawn(&fileWriter); foreach (ubyte[] buffer; file.byChunk(bufferSize)) { send(tid, buffer.idup); } } void fileWriter() { auto file = File("writefile.txt", "w"); for (;;) { auto wbuf = receiveOnly!(ubyte[])(); file.writeln("writefile.txt", wbuf); } } From, Vino.B
Re: inferred size for static array initialization
On Monday, 2 May 2016 at 17:43:56 UTC, Namespace wrote: I still like auto s(T, size_t n)(T[n] arr) { return arr; } Wooah, this trick is awesome. But actually it does the same thing that what I've proposed before. Exactly the same code is generated. So I'd say that it's rather a matter of readability. https://godbolt.org/g/wGTs52 https://godbolt.org/g/cXECyO