Re: Using D within a rust codebase
On Sunday, 26 July 2020 at 21:18:19 UTC, powerboat9 wrote:
I have an existing rust project, and I'm trying to rewrite part
of it in D. However, I'm not sure how to get rust -> dlang
interop working. I've looked into rust -> c -> dlang interop,
but I'm not sure how to get c -> dlang interop working either.
Here's the basic approach:
1. Write an `extern(C)` function in D.
2. Write a corresponding declaration of that function in C
(typically, in a header file).
3. Use your D and C compilers to separately compile your D and C
source files, respectively.
4. Use your D compiler to link the resulting object files.
For example, given these source files:
--- lib.d
extern(C) void hello()
{
import std.stdio: writeln;
writeln("Hello from D!");
}
--- lib.h
void hello();
--- main.c
#include "lib.h"
void main()
{
hello();
}
...you can compile them with the following commands:
$ dmd -c lib.d # produces lib.o
$ gcc -c main.c# produces main.o
$ dmd main.o lib.o # produces main
You should now be able run `./main` and see it print "Hello from
D!"
Re: Template error with gdc-10 but not with latest dmd and ldc
On Sunday, 26 July 2020 at 21:48:09 UTC, Per Nordlöw wrote:
I see. Thanks.
The code
long add_long_n0(alias T=void)(long x) { return x + 0; }
should be
long add_long_n0(T=void)(long x) { return x + 0; }
. My mistake.
Thanks.
Re: Template error with gdc-10 but not with latest dmd and ldc
On Sunday, 26 July 2020 at 20:32:55 UTC, Iain Buclaw wrote: This feature? https://dlang.org/changelog/2.087.0.html#template_alias_matches_basic_types I see. Thanks.
Using D within a rust codebase
I have an existing rust project, and I'm trying to rewrite part of it in D. However, I'm not sure how to get rust -> dlang interop working. I've looked into rust -> c -> dlang interop, but I'm not sure how to get c -> dlang interop working either.
Re: Template error with gdc-10 but not with latest dmd and ldc
On Sunday, 26 July 2020 at 19:27:13 UTC, rikki cattermole wrote: 2.066.0 to 2.078.1: Failure with output: onlineapp.d(7): Error: template instance add_long_n0!void does not match template declaration add_long_n0(alias T = void)(long x) 2.079.1 to 2.086.1: Failure with output: onlineapp.d(7): Error: template instance `add_long_n0!void` does not match template declaration `add_long_n0(alias T = void)(long x)` Since 2.087.1: Success and no output This feature? https://dlang.org/changelog/2.087.0.html#template_alias_matches_basic_types
Re: Template error with gdc-10 but not with latest dmd and ldc
On Sunday, 26 July 2020 at 19:27:13 UTC, rikki cattermole wrote:
Old frontend:
Up to 2.060 : Failure with output: onlineapp.d(2): Error:
valid attribute identifiers are @property, @safe, @trusted,
@system, @disable not @nogc
2.061 to 2.065.0: Failure with output:
-
onlineapp.d(2): Error: user defined attributes cannot appear as
postfixes
onlineapp.d(2): Error: semicolon expected following function
declaration
onlineapp.d(2): Error: Declaration expected, not 'return'
onlineapp.d(2): Error: unrecognized declaration
-
2.066.0 to 2.078.1: Failure with output: onlineapp.d(7): Error:
template instance add_long_n0!void does not match template
declaration add_long_n0(alias T = void)(long x)
2.079.1 to 2.086.1: Failure with output: onlineapp.d(7): Error:
template instance `add_long_n0!void` does not match template
declaration `add_long_n0(alias T = void)(long x)`
Since 2.087.1: Success and no output
I don't understand.
I removed the qualifiers but still get the same error from this
unqualified code:
long add_long_n0(alias T=void)(long x) { return x + 0; }
int main(string[] args) {
long long_sum = 0;
long_sum += add_long_n0!(void)(0);
return cast(int)long_sum;
}
Re: Template error with gdc-10 but not with latest dmd and ldc
Old frontend: Up to 2.060 : Failure with output: onlineapp.d(2): Error: valid attribute identifiers are @property, @safe, @trusted, @system, @disable not @nogc 2.061 to 2.065.0: Failure with output: - onlineapp.d(2): Error: user defined attributes cannot appear as postfixes onlineapp.d(2): Error: semicolon expected following function declaration onlineapp.d(2): Error: Declaration expected, not 'return' onlineapp.d(2): Error: unrecognized declaration - 2.066.0 to 2.078.1: Failure with output: onlineapp.d(7): Error: template instance add_long_n0!void does not match template declaration add_long_n0(alias T = void)(long x) 2.079.1 to 2.086.1: Failure with output: onlineapp.d(7): Error: template instance `add_long_n0!void` does not match template declaration `add_long_n0(alias T = void)(long x)` Since 2.087.1: Success and no output
Template error with gdc-10 but not with latest dmd and ldc
The code example
long add_long_n0(alias T=void)(long x) @safe pure nothrow @nogc {
return x + 0; }
int main(string[] args)
{
long long_sum = 0;
long_sum += add_long_n0!(void)(cast(long)0);
return cast(int)long_sum;
}
compiles without errors with dmd and ldc. But with gdc-10 as
gdc -c linear_t.d
it errors as
linear_t.d:6:17: error: template instance add_long_n0!() does not
match template declaration add_long_n0(alias T = void)(long x)
6 | long_sum += add_long_n0!()(cast(long)0);
| ^
Why can't LDC handle such a trivial template example?
Re: Help with Ranges
On 7/26/20 3:10 AM, Charles wrote:
Suppose I have the following line of code where arr is an array,
doSomething is some predicate that does a lot of processing on each
element, sort must come after the mapping, and there are more operations
done to the range after sort:
arr.map!doSomething.sort. ...;
Sort fails to instantiate because the range it's receiving doesn't
support element swapping. This may and might be resolved by calling array:
arr.map!doSomething.array.sort. ...;
However, this might trigger an allocation, and there's still more to do!
Is there something I'm missing with regards to ranges that could help me
make the first line work without using array, or is it more of an issue
with my code's design?
That is what you need to do.
A map that returns an lvalue would be sortable, but you would be sorting
the processed elements, and probably not the original elements.
I have found this handy tool quite useful in my code where I need a
temporary array:
// creates a concrete range (std.container.array.Array range) out of the
// original range that is eagerly fetched, and then can be processed,
without
// allocating extra garbage on the heap.
auto concreteRange(Range)(Range r)
{
import std.range : ElementType;
import std.container.array : Array;
return Array!(ElementType!Range)(r)[];
}
Slicing an Array will keep the reference count correctly, and destroy
the memory automatically after you're done using it. So it's perfect for
temporary arrays in pipelining.
-Steve
Re: Static link of glfw3 library fails for me
On Sunday, 26 July 2020 at 10:41:27 UTC, Mike Parker wrote: On Sunday, 26 July 2020 at 08:28:29 UTC, John Burton wrote: And I get the following errors from the link :- lld-link: error: undefined symbol: __GSHandlerCheck lld-link: error: undefined symbol: __security_check_cookie lld-link: error: undefined symbol: __security_cookie I believe that's because the GLFW library was compiled with the Microsoft compiler's /GS option: https://docs.microsoft.com/en-us/cpp/build/reference/gs-buffer-security-check?view=vs-2019 The __security_* functions are MS extensions to the C standard library. A quick search suggests you should try linking with bufferoverflowU.lib. Either that or compile GLFW with /GS- to turn off the security checks. This is one reason I gave on on static linking pre-built C binaries long ago. I use the static bindings with import libraries, but I don't touch static libs unless I compile them myself. Thank you. I'll look into this. I wanted a single statically linked binary for an application I had in mind so thought I'd try this out. It's nice just to be able to send a single binary without needing to have an installer or copy multiple files for some use cases. This is the main reason I quite like go, not so much for the language but that things like "gitea" can be just one single binary and nothing else. I can rebuild glfw I guess, that's not a problem (but makes it harder for people if I want to share my code of course). Perhaps I ought to try this. I understand, as mentioned in your other reply, that I'll have to link with all the other dependencies of glfw too. I oversimplified my example a bit too much :)
Re: Static link of glfw3 library fails for me
On Sunday, 26 July 2020 at 08:28:29 UTC, John Burton wrote: versions "BindGLFW_Static" libs "glfw3" lflags "-L..\\work\\3rdparty\\lib" And by the way, you're going to need to link more libs than glfw3 for a static link. You'll need all of its dependencies, as well (OpenGL32.lib, gdi32.lib, etc).
Re: Static link of glfw3 library fails for me
On Sunday, 26 July 2020 at 08:28:29 UTC, John Burton wrote: And I get the following errors from the link :- lld-link: error: undefined symbol: __GSHandlerCheck lld-link: error: undefined symbol: __security_check_cookie lld-link: error: undefined symbol: __security_cookie I believe that's because the GLFW library was compiled with the Microsoft compiler's /GS option: https://docs.microsoft.com/en-us/cpp/build/reference/gs-buffer-security-check?view=vs-2019 The __security_* functions are MS extensions to the C standard library. A quick search suggests you should try linking with bufferoverflowU.lib. Either that or compile GLFW with /GS- to turn off the security checks. This is one reason I gave on on static linking pre-built C binaries long ago. I use the static bindings with import libraries, but I don't touch static libs unless I compile them myself.
Static link of glfw3 library fails for me
I'm trying to replicate a program I make in C++ using D. I am using the ldc2 compiler and want to *static* link in the glfw library. Following the docs I have an dub.sdl file that looks like the one below. The library I'm linking with is the vs2019 one from the GLFW zip file from their website. My program isn't work showing, it just calls glfwInit, creates a windows, and does a basic event loop. (This is a simplified test made when I couldn't get my real program to link) However I get link errors shown below. Am I doing this wrong? Am I using the wrong library to link with? (And if so which should I use). Am I missing any options etc? Or will this just not work with ldc2? Thanks for any help! My dub.sdl file looks like this :- name "game" description "Test Project" authors "Me" copyright "Copyright © 2020, Me" license "proprietary" dependency "bindbc-glfw" version="~>0.10.0" versions "BindGLFW_Static" libs "glfw3" lflags "-L..\\work\\3rdparty\\lib" And I get the following errors from the link :- lld-link: error: undefined symbol: __GSHandlerCheck lld-link: error: undefined symbol: __security_check_cookie lld-link: error: undefined symbol: __security_cookie
Help with Ranges
Suppose I have the following line of code where arr is an array, doSomething is some predicate that does a lot of processing on each element, sort must come after the mapping, and there are more operations done to the range after sort: arr.map!doSomething.sort. ...; Sort fails to instantiate because the range it's receiving doesn't support element swapping. This may and might be resolved by calling array: arr.map!doSomething.array.sort. ...; However, this might trigger an allocation, and there's still more to do! Is there something I'm missing with regards to ranges that could help me make the first line work without using array, or is it more of an issue with my code's design?
