preprocessor | Kotlin source file preprocessor used in the RM to support | Plugin library
kandi X-RAY | preprocessor Summary
kandi X-RAY | preprocessor Summary
To support multiple Minecraft versions with the ReplayMod, a JCP-inspired preprocessor is used:. Any comments starting with //$$ will automatically be introduced / removed based on the surrounding condition(s). Normal comments are left untouched. The //#else branch is optional. Conditions can be nested arbitrarily but their indention shall always be equal to the indention of the code at the //#if line. The //$$ shall be aligned with the inner-most //#if. Code for the more recent MC version shall be placed in the first branch of the if-else-construct. Version-dependent import statements shall be placed separately from and after all other imports but before the static and java.* imports. The source code resides in src/main (gradle project determined by versions/mainVersion e.g. with 11404 it'll be :1.14.4) and is automatically passed through the preprocessor when any of the other versions are built (gradle projects :1.8, :1.8.9, etc.). Do NOT edit any of the code in versions/$MCVERSION/build/ as it is automatically generated and will be overwritten without warning.
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QUESTION
Motivating background info: I maintain a C++ library, and I spent way too much time this weekend tracking down a mysterious memory-corruption problem in an application that links to this library. The problem eventually turned out to be caused by the fact that the C++ library was built with a particular -DBLAH_BLAH
compiler-flag, while the application's code was being compiled without that -DBLAH_BLAH
flag, and that led to the library-code and the application-code interpreting the classes declared in the library's header-files differently in terms of data-layout. That is: sizeof(ThisOneParticularClass)
would return a different value when invoked from a .cpp file in the application than it would when invoked from a .cpp file in the library.
So far, so unfortunate -- I have addressed the immediate problem by making sure that the library and application are both built using the same preprocessor-flags, and I also modified the library so that the presence or absence of the -DBLAH_BLAH
flag won't affect the sizeof()
its exported classes... but I feel like that wasn't really enough to address the more general problem of a library being compiled with different preprocessor-flags than the application that uses that library. Ideally I'd like to find a mechanism that would catch that sort of problem at compile-time, rather than allowing it to silently invoke undefined behavior at runtime. Is there a good technique for doing that? (All I can think of is to auto-generate a header file with #ifdef/#ifndef
tests for the application code to #include
, that would deliberately #error
out if the necessary #define
s aren't set, or perhaps would automatically-set the appropriate #define
s right there... but that feels a lot like reinventing automake
and similar, which seems like potentially opening a big can of worms)
ANSWER
Answered 2022-Apr-04 at 16:07One way of implementing such a check is to provide definition/declaration pairs for global variables that change, according to whether or not particular macros/tokens are defined. Doing so will cause a linker error if a declaration in a header, when included by a client source, does not match that used when building the library.
As a brief illustration, consider the following section, to be added to the "MyLibrary.h" header file (included both when building the library and when using it):
QUESTION
I've been upgrading my CRA project to TailwindCSS 3, but now CSS nesting no longer works. Upon starting the server, the console spits out:
...ANSWER
Answered 2022-Feb-03 at 18:38This is mostly just bad news.
Create React App's Tailwind support means that they will detect tailwind.config.js
in the project and add tailwindcss
to their existing postcss
configuration. Source in CRA
The guide that Tailwind offers on their site creates a dummy postcss.config.js
- Making changes in this file does not change the actual postcss configuration. (misleading if anything)
This is a known issue currently - Github discussion on Tailwind support PR between Adam Wathan (Tailwind founder) and Ian Sutherland (CRA maintainer). But it does not seem like there is an intention to be fixed soon.
If you want to use nesting (or any PostCSS plugin really) is to eject from CRA using:
QUESTION
I am amazed at how many topics on StackOverflow deal with finding out the endianess of the system and converting endianess. I am even more amazed that there are hundreds of different answers to these two questions. All proposed solutions that I have seen so far are based on undefined behaviour, non-standard compiler extensions or OS-specific header files. In my opinion, this question is only a duplicate if an existing answer gives a standard-compliant, efficient (e.g., use x86-bswap
), compile time-enabled solution.
Surely there must be a standard-compliant solution available that I am unable to find in the huge mess of old "hacky" ones. It is also somewhat strange that the standard library does not include such a function. Perhaps the attitude towards such issues is changing, since C++20 introduced a way to detect endianess into the standard (via std::endian
), and C++23 will probably include std::byteswap
, which flips endianess.
In any case, my questions are these:
Starting at what C++ standard is there a portable standard-compliant way of performing host to network byte order conversion?
I argue below that it's possible in C++20. Is my code correct and can it be improved?
Should such a pure-c++ solution be preferred to OS specific functions such as, e.g., POSIX-
htonl
? (I think yes)
I think I can give a C++23 solution that is OS-independent, efficient (no system call, uses x86-bswap
) and portable to little-endian and big-endian systems (but not portable to mixed-endian systems):
ANSWER
Answered 2022-Feb-06 at 05:48compile time-enabled solution.
Consider whether this is useful requirement in the first place. The program isn't going to be communicating with another system at compile time. What is the case where you would need to use the serialised integer in a compile time constant context?
- Starting at what C++ standard is there a portable standard-compliant way of performing host to network byte order conversion?
It's possible to write such function in standard C++ since C++98. That said, later standards bring tasty template goodies that make this nicer.
There isn't such function in the standard library as of the latest standard.
- Should such a pure-c++ solution be preferred to OS specific functions such as, e.g., POSIX-htonl? (I think yes)
Advantage of POSIX is that it's less important to write tests to make sure that it works correctly.
Advantage of pure C++ function is that you don't need platform specific alternatives to those that don't conform to POSIX.
Also, the POSIX htonX are only for 16 bit and 32 bit integers. You could instead use htobeXX functions instead that are in some *BSD and in Linux (glibc).
Here is what I have been using since C+17. Some notes beforehand:
Since endianness conversion is always1 for purposes of serialisation, I write the result directly into a buffer. When converting to host endianness, I read from a buffer.
I don't use
CHAR_BIT
because network doesn't know my byte size anyway. Network byte is an octet, and if your CPU is different, then these functions won't work. Correct handling of non-octet byte is possible but unnecessary work unless you need to support network communication on such system. Adding an assert might be a good idea.I prefer to call it big endian rather than "network" endian. There's a chance that a reader isn't aware of the convention that de-facto endianness of network is big.
Instead of checking "if native endianness is X, do Y else do Z", I prefer to write a function that works with all native endianness. This can be done with bit shifts.
Yeah, it's constexpr. Not because it needs to be, but just because it can be. I haven't been able to produce an example where dropping constexpr would produce worse code.
QUESTION
Goal: to run this Auto Labelling Notebook on AWS SageMaker Jupyter Labs.
Kernels tried: conda_pytorch_p36
, conda_python3
, conda_amazonei_mxnet_p27
.
ANSWER
Answered 2022-Feb-03 at 09:29I would recommend to downgrade your milvus version to a version before the 2.0 release just a week ago. Here is a discussion on that topic: https://github.com/deepset-ai/haystack/issues/2081
QUESTION
This is a React web app. When I run
...ANSWER
Answered 2021-Nov-13 at 18:36I am also stuck with the same problem because I installed the latest version of Node.js (v17.0.1).
Just go for node.js v14.18.1
and remove the latest version just use the stable version v14.18.1
QUESTION
I'm using cucumber preprocessor and we do not have a standard folder structure. The cypress.json file is under a e2e folder. With cypress open, it was fine because I could specify the cypress.json file location. However, with cypress-tags run, there seems to be no way to specify the location of the cypress.json file and it just fails with error:
...ANSWER
Answered 2021-Dec-16 at 16:38I also stumbled upon this problem and realized that this does not work actually.
As a workaround I therefore moved away from the approach of using cypress-tags and instead adjusted the naming of my feature files. This allowed me to avoid the use of cypress-tags and use the normal cypress run command instead specifying config and feature files like:
QUESTION
I am using Tailwind CSS 3.0 and have configured it according to the Using with Preprocessors documentation.
My main.css
file looks like this:
ANSWER
Answered 2022-Jan-03 at 13:19It turns out I wasn't actually using PostCSS directly when using npx tailwindcss
. As explained on the Tailwind CSS Getting Started guide, Tailwind CLI and PostCSS are two different ways of using Tailwind.
So in the above question, the answer is to use PostCSS CLI and invoke the build using: postcss ./Styles/v2/main.css -o style.css --watch
.
QUESTION
I am looking for a preprocessor symbol that would allow me to compile different code based on whether a project is xamarin or not.
...ANSWER
Answered 2021-Dec-19 at 12:15I would suggest you don't use preprocessor symbols, but abstract stuff in separate classes for each platform. Then inject the specific implementation at runtime.
If you really must use these, you can always define your own symbols as needed for each configuration or target framework.
Just create a file called Directory.Build.targets
(casing matters!) in the root of your repo. Usually next to your .sln
file.
In this Directory.Build.targets
you can define symbols like so:
QUESTION
TL;DR: Debuigging into MFC (CString
) header code does not work on both my machines and as far as I can tell this is due to the peculiar way these headers are compiled.
Stepping through MFC header code when entered via disassembly works, but setting brealpoints does not work.
I'm looking for a workaround or at least acknowledgement of my analysis.
System:
- Visual Studio 2019 Professional 16.9.6
- Windows 10 / 1809 Enterprise LTSC
Setup: (I do apologize for this being rather long.)
Create a Visual Studio 2019 Example MFC Application Project (SDI App)
Make sure
Enable Just My Code
is off under Options -> Debugging -> General.Set the build configuration to Debug/x64 (does not make a difference, but let's all stay on the same page)
Navigate to
MFCApplication1.cpp
->CMFCApplication1App::InitInstance()
Insert a CString init like this:
...
ANSWER
Answered 2021-Dec-01 at 10:41Uncheck the Enable Just My Code option in Tools->Options->Debugging
I know that works for c++ std:: library code debugging. The other technique I do, when I forget to uncheck this option, is similar to what you describe above.
- Set a breakpoint on the line of code I want to step into.
- When the breakpoint is reached, right click in the editor window and select "Go To Disassemly".
- In disassembly mode, step over until you get to a
call
statement. That's typically the std library. Eventually, you'll navigate into a mix of assembly and system code sources. You can flip out of disassembly mode by right-clicking again and selecting "go to source code".
QUESTION
I want to create different types that are uint32_t but are different from compilers perspective -- they can only be compared and assigned to a value of the exact same type. Here is a sample code that I want to achieve:
...ANSWER
Answered 2021-Nov-26 at 22:41You can create a templated archetype and make type-tagged versions of that.
I made this a while back and haven't used it yet, so no testing, but I think the idea should be sound:
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