Re: Can you access the same classes from C++ and D and vise versa, or do the classes have to not form dependency cycle?
On Tuesday, 13 September 2022 at 03:13:59 UTC, Daniel Donnell, Jr wrote: On Sunday, 11 September 2022 at 02:14:51 UTC, zjh wrote: On Saturday, 10 September 2022 at 22:07:32 UTC, Ali Çehreli wrote: On 9/10/22 13:04, Daniel Donnell wrote: > https://dlang.org/spec/cpp_interface.html At DConf, Manu indicated that that page is outdated and that D's C++ support is actually a lot better. Update it quickly, This is a big selling point. So what is the answer here? I'm not sure what they were getting at... You can https://stackoverflow.com/a/53710273
Re: can not take const struct member address at CTFE , is this a bug?
On 9/14/22 12:53 AM, test123 wrote:
On Wednesday, 14 September 2022 at 00:40:38 UTC, Ruby The Roobster wrote:
The addresses of items stored in memory are by definition not
constant. This isn't a bug.
If so why this can work ?
```d
struct c { uint a, b;}
__gshared const c d = { 3, 4};
__gshared const e = & d;
```
the `e` can get address of `d`, then it should be to get address of `d.a`
Yes, this looks like a bug. Please report if not reported already.
-Steve
Re: plot api
On Wednesday, 14 September 2022 at 19:34:56 UTC, Alain De Vos wrote: Let's say i want to plot the function f(x)=sin(x)/x. Which API would you advice, in order for me to not re-invent the wheel. Have you tried ggplotd? https://code.dlang.org/packages/ggplotd
Building Example Project with `raylib-d`
Hello, I used the following steps to build the example `raylib-d` program. (https://github.com/schveiguy/raylib-d#example) ### Install Raylib (Ubuntu/Debian) 1. `sudo apt install libasound2-dev mesa-common-dev libx11-dev libxrandr-dev libxi-dev xorg-dev libgl1-mesa-dev libglu1-mesa-dev` 1. `cd /tmp` 1. `git clone https://github.com/raysan5/raylib.git raylib` 1. `cd raylib` 1. `mkdir build && cd build` 1. `cmake -DBUILD_SHARED_LIBS=ON ..` 1. `make -j2` 1. `sudo make install` 1. `sudo reboot now` ### Dlang Raylib API 1. Install Dlang 1. Navigate to project root directory 1. `mkdir source` 1. `touch source/app.d` 1. Code: https://github.com/schveiguy/raylib-d#example 1. `dub add raylib-d` 1. `dub build` ### Errors encountered ``` Performing "debug" build using /usr/bin/dmd for x86_64. 00_test ~master: building configuration "application"... Linking... /usr/bin/ld: .dub/build/application-debug-linux.posix-x86_64-dmd_v2.100.0-533EF886932B3BC59F9F09D93C0642F5/00_test.o: in function `_D6raylib7binding21validateRaylibBindingFNbNiZv': /home/james/.dub/packages/raylib-d-4.2.0/raylib-d/source/raylib/binding.d:26: undefined reference to `raylibVersion' /usr/bin/ld: /home/james/.dub/packages/raylib-d-4.2.0/raylib-d/source/raylib/binding.d:26: undefined reference to `raylibVersion' collect2: error: ld returned 1 exit status Error: linker exited with status 1 /usr/bin/dmd failed with exit code 1. ``` ### Questions There appears to be a linker problem with regards to missing symbols, but normally I would expect `make install` to place the shared libs in their proper places. 1. Have I missed an install step? 1. What are my next troubleshooting steps?
plot api
Let's say i want to plot the function f(x)=sin(x)/x. Which API would you advice, in order for me to not re-invent the wheel.
Re: C function taking two function pointers that share calculation
On Wednesday, 14 September 2022 at 17:23:47 UTC, jmh530 wrote: There is a C library I sometimes use that has a function that takes two function pointers. However, there are some calculations that are shared between the two functions that would get pointed to. I am hoping to only need to do these calculations once. [...] Maybe others know better but I would have thought the only way is to use globals to do this. Often c libraries that I have used get round this by taking a function and a pointer and then the library calls your function on the pointer simulating a d delegate.
Re: Poste some interesting vibe.d webpages
Although the framework is good. There is no community. Or general acceptance. Which is a pitty. Currently I ask myself how to do "sessions" with vibe.d.
C function taking two function pointers that share calculation
There is a C library I sometimes use that has a function that
takes two function pointers. However, there are some calculations
that are shared between the two functions that would get pointed
to. I am hoping to only need to do these calculations once.
The code below sketches out the general idea of what I've tried
so far. The function `f` handles both of the calculations that
would be needed, returning a struct. Functions `gx` and `gy` can
return the field of the struct that is relevant. Both of them
could then get fed into the C function as function pointers.
My concern is that `f` would then get called twice, whereas that
wouldn't be the case in a simpler implementation (`gx_simple`,
`gy_simple`). ldc will optimize the issue away in this simple
example, but I worry that might not generally be the case.
How do I ensure that the commonCalculation is only done once?
```d
struct Foo
{
int x;
int y;
}
Foo f(int x, int a)
{
int commonCalculation = a * x;
return Foo(commonCalculation * x, 2 * commonCalculation);
}
int gx(int x, int a) { return f(x, a).x;}
int gy(int x, int a) { return f(x, a).y;}
//int gx_simple(int x, int a) { return a * x * x;}
//int gy_simple(int x, int a) { return 2 * a * x;}
void main() {
import core.stdc.stdio: printf;
printf("the value of x is %i\n", gx(3, 2));
printf("the value of y is %i\n", gy(3, 2));
}
```
Re: C function taking two function pointers that share calculation
On Wednesday, 14 September 2022 at 18:02:07 UTC, JG wrote: [snip] Maybe others know better but I would have thought the only way is to use globals to do this. Often c libraries that I have used get round this by taking a function and a pointer and then the library calls your function on the pointer simulating a d delegate. The C function does make use of a pointer to some data (that I neglected to mention), but your comment gives me an idea. Thanks.
Re: Building Example Project with `raylib-d`
On 9/14/22 4:17 PM, jwatson-CO-edu wrote: Hello, I used the following steps to build the example `raylib-d` program. (https://github.com/schveiguy/raylib-d#example) ### Install Raylib (Ubuntu/Debian) 1. `sudo apt install libasound2-dev mesa-common-dev libx11-dev libxrandr-dev libxi-dev xorg-dev libgl1-mesa-dev libglu1-mesa-dev` 1. `cd /tmp` 1. `git clone https://github.com/raysan5/raylib.git raylib` 1. `cd raylib` 1. `mkdir build && cd build` 1. `cmake -DBUILD_SHARED_LIBS=ON ..` 1. `make -j2` 1. `sudo make install` 1. `sudo reboot now` ### Dlang Raylib API 1. Install Dlang 1. Navigate to project root directory 1. `mkdir source` 1. `touch source/app.d` 1. Code: https://github.com/schveiguy/raylib-d#example 1. `dub add raylib-d` 1. `dub build` ### Errors encountered ``` Performing "debug" build using /usr/bin/dmd for x86_64. 00_test ~master: building configuration "application"... Linking... /usr/bin/ld: .dub/build/application-debug-linux.posix-x86_64-dmd_v2.100.0-533EF886932B3BC59F9F09D93C0642F5/00_test.o: in function `_D6raylib7binding21validateRaylibBindingFNbNiZv': /home/james/.dub/packages/raylib-d-4.2.0/raylib-d/source/raylib/binding.d:26: undefined reference to `raylibVersion' /usr/bin/ld: /home/james/.dub/packages/raylib-d-4.2.0/raylib-d/source/raylib/binding.d:26: undefined reference to `raylibVersion' collect2: error: ld returned 1 exit status Error: linker exited with status 1 /usr/bin/dmd failed with exit code 1. ``` ### Questions There appears to be a linker problem with regards to missing symbols, but normally I would expect `make install` to place the shared libs in their proper places. You built the unreleased version of raylib, where they changed the name of that symbol. (see https://github.com/raysan5/raylib/commit/082920eb800d7d7612d500a4bbc46b21ff232424) Try `git checkout 4.2.0` on the raylib library before building, or use the released binary. raylib is notorious for making breaking changes. On the next release, I will have to update that symbol name. -Steve
Re: Building Example Project with `raylib-d`
On Wednesday, 14 September 2022 at 23:42:57 UTC, Steven Schveighoffer wrote: On 9/14/22 4:17 PM, jwatson-CO-edu wrote: Hello, I used the following steps to build the example `raylib-d` program. (https://github.com/schveiguy/raylib-d#example) ### Install Raylib (Ubuntu/Debian) 1. `sudo apt install libasound2-dev mesa-common-dev libx11-dev libxrandr-dev libxi-dev xorg-dev libgl1-mesa-dev libglu1-mesa-dev` 1. `cd /tmp` 1. `git clone https://github.com/raysan5/raylib.git raylib` 1. `cd raylib` 1. `mkdir build && cd build` 1. `cmake -DBUILD_SHARED_LIBS=ON ..` 1. `make -j2` 1. `sudo make install` 1. `sudo reboot now` ### Dlang Raylib API 1. Install Dlang 1. Navigate to project root directory 1. `mkdir source` 1. `touch source/app.d` 1. Code: https://github.com/schveiguy/raylib-d#example 1. `dub add raylib-d` 1. `dub build` ### Errors encountered ``` Performing "debug" build using /usr/bin/dmd for x86_64. 00_test ~master: building configuration "application"... Linking... /usr/bin/ld: .dub/build/application-debug-linux.posix-x86_64-dmd_v2.100.0-533EF886932B3BC59F9F09D93C0642F5/00_test.o: in function `_D6raylib7binding21validateRaylibBindingFNbNiZv': /home/james/.dub/packages/raylib-d-4.2.0/raylib-d/source/raylib/binding.d:26: undefined reference to `raylibVersion' /usr/bin/ld: /home/james/.dub/packages/raylib-d-4.2.0/raylib-d/source/raylib/binding.d:26: undefined reference to `raylibVersion' collect2: error: ld returned 1 exit status Error: linker exited with status 1 /usr/bin/dmd failed with exit code 1. ``` ### Questions There appears to be a linker problem with regards to missing symbols, but normally I would expect `make install` to place the shared libs in their proper places. You built the unreleased version of raylib, where they changed the name of that symbol. (see https://github.com/raysan5/raylib/commit/082920eb800d7d7612d500a4bbc46b21ff232424) Try `git checkout 4.2.0` on the raylib library before building, or use the released binary. raylib is notorious for making breaking changes. On the next release, I will have to update that symbol name. -Steve That worked immediately, thank you! Honored to have the direct attention of and detailed advice from the package author. I have the corrected install instructions below, in case someone finds this post while resolving the same issue: ### Install Raylib (Ubuntu/Debian) 1. `sudo apt install libasound2-dev mesa-common-dev libx11-dev libxrandr-dev libxi-dev xorg-dev libgl1-mesa-dev libglu1-mesa-dev` 1. `cd /tmp` 1. `git clone https://github.com/raysan5/raylib.git raylib` 1. `cd raylib` 1. **`git checkout 4.2.0`** # 2022-09-14: Or the version currently targeted by `raylib-d` 1. `mkdir build && cd build` 1. `cmake -DBUILD_SHARED_LIBS=ON ..` 1. `make -j2` 1. `sudo make install` 1. `sudo reboot now` ### Add Dlang Raylib API, Build, and Run 1. Install Dlang 1. Navigate to project root directory 1. `mkdir source` 1. `touch source/app.d` 1. Code: https://github.com/schveiguy/raylib-d#example 1. `dub add raylib-d` 1. `dub build` 1. `./PROJECTNAME`
Re: can not take const struct member address at CTFE , is this a bug?
On Wednesday, 14 September 2022 at 14:41:38 UTC, Steven
Schveighoffer wrote:
On 9/14/22 12:53 AM, test123 wrote:
On Wednesday, 14 September 2022 at 00:40:38 UTC, Ruby The
Roobster wrote:
The addresses of items stored in memory are by definition not
constant. This isn't a bug.
If so why this can work ?
```d
struct c { uint a, b;}
__gshared const c d = { 3, 4};
__gshared const e = & d;
```
the `e` can get address of `d`, then it should be to get
address of `d.a`
Yes, this looks like a bug. Please report if not reported
already.
-Steve
Thanks for explain.
Some how I can not create account for d Bugs, I hope we have use
github bugs.
Please help me create a bug report if who has free time and bugs
account.
