nanobind
ComLightInterop
nanobind | ComLightInterop | |
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11 | 8 | |
2,042 | 43 | |
- | - | |
9.6 | 4.2 | |
4 days ago | 6 months ago | |
C++ | C# | |
BSD 3-clause "New" or "Revised" License | MIT License |
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nanobind
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Progress on No-GIL CPython
Take a look at https://github.com/wjakob/nanobind
> More concretely, benchmarks show up to ~4× faster compile time, ~5× smaller binaries, and ~10× lower runtime overheads compared to pybind11.
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Advanced Python Mastery – A Course by David Beazley
People should not take that an endorsement of Swig.
Please use ctypes, cffi or https://github.com/wjakob/nanobind
Beazley himself is amazed that it (Swig) is still in use.
- Swig – Connect C/C++ programs with high-level programming languages
- Nanobind: Tiny and efficient C++/Python bindings
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Create Python bindings for my C++ code with PyBind11
Nanobind made by the creator of PyBind11, it has a similar interface, but it takes leverage of C++17 and it aims to have more efficient bindings in space and speed.
- Nanobind – Seamless operability between C++17 and Python
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Cython Is 20
I would recommend using NanoBind, the follow up of PyBind11 by the same author (Wensel Jakob), and move as much performance critical code to C or C++. https://github.com/wjakob/nanobind
If you really care about performance called from Python, consider something like NVIDIA Warp (Preview). Warp jits and runs your code on CUDA or CPU. Although Warp targets physics simulation, geometry processing, and procedural animation, it can be used for other tasks as well. https://github.com/NVIDIA/warp
Jax is another option, by Google, jitting and vectorizing code for TPU, GPU or CPU. https://github.com/google/jax
- GitHub - wjakob/nanobind: nanobind — Seamless operability between C++17 and Python
ComLightInterop
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Swig – Connect C/C++ programs with high-level programming languages
I have once made something remotely similar, to interop between C++ and C#: https://github.com/Const-me/ComLightInterop
I took different approach. Because I only needed to support these two languages, there’s no separate interface definition language, and no code generator for interfaces. Instead, users are expected to write both language projections manually.
Then there’s a runtime code generator on the .NET side of the interop which builds runtime callable proxy types for interfaces implemented in C++, also virtual tables for C# objects consumed by C++.
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C# 11 Preview Updates – Raw string literals, UTF-8 and more
It’s pretty fast. Likely reason for that, MS designed both language and runtime this way since version 1.0. They needed that for their Windows Forms which consumes huge chunk of WinAPI.
I benchmarked a while ago when testing this library https://github.com/Const-me/ComLightInterop#performance On the computer I was using at that time (probably Ryzen 5 3600 CPU) the overhead was 15-20 nanoseconds per call.
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Mach v0.1 – cross-platform Zig graphics in ~60 seconds
That thing is COM, which is a small subset of C++ ABI. Technically it’s about the same as on Windows, i.e. C ABI with extra first argument for this pointer.
Once upon a time I made this library https://github.com/const-me/comlightInterop/ The native side of the interop is idiomatic C++, here’s an example https://github.com/Const-me/ComLightInterop/blob/master/Demo... The C# side of the interop is implemented through the built-in C interop, here’s the relevant part of the library https://github.com/Const-me/ComLightInterop/blob/master/ComL... I’ve tested Linux version of that library on AMD64, ARMv7, and ARM64 CPUs, but only with gcc compiler on the native side.
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COM+ Revisited
I like many parts of COM, but I believe that example mostly demonstrates bad parts, with IDL, registrations, and over-engineered support libraries.
There's nothing wrong with exporting factory functions from DLLs. Microsoft does it all the time, APIs like Direct3D, DirectDraw and Media Foundation don't come with type libraries are they aren't registered anywhere.
Speaking about support libraries, I once made my own: https://github.com/Const-me/ComLightInterop/tree/master/ComL... Compare examples from that article with this one: https://github.com/Const-me/ComLightInterop/blob/master/Demo... That source file is the complete DLL which implements a minimalistic COM object.
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The Serde Rust Framework
> Does it feel "brittle" to use
Yes and no.
No because when you try to do unsupported things like calling a method on an object which doesn’t support one, you gonna get an appropriate runtime exception.
Yes because if you fail lower-level things like local parameter allocation, you gonna get an appropriate runtime exception but that one is (1) too late, I’d prefer such things to be detected when you emit the code, not when trying to use the generated code (2) Lacks the context.
Overall, when I can I’m using that higher-level System.Linq.Expressions for runtime codegen. Things are much nicer at that level. I only using the low-level thing when I need to emit new types, like there: https://github.com/Const-me/ComLightInterop/blob/master/ComL...
- Weird
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Building a shared vision for Async Rust
> Do you have any good resources on writing dlls to consume via .net like you’re talking about?
For C APIs i.e. functions, structures and strings, the good resource is Microsoft documentation, the support is built-in, see “Consuming Unmanaged DLL Functions” section: https://docs.microsoft.com/en-us/dotnet/framework/interop/
For COM APIs i.e. sharing objects around see this library + demos: https://github.com/Const-me/ComLightInterop It’s only really needed on Linux because the desktop version of the framework has COM support already built-in, but it can be used for cross-platform things just fine, I tested that quite well i.e. not just with these simple demos.
> How do you deal with the managed memory when using the gc from .net
Most of the time, automatically.
When you calling C++ from C#, the runtime automatically pins arguments like strings or arrays. Pinning means until the C++ function returns, .NET GC won’t touch these things. This doesn’t normally make any copies: C++ will receive raw pointers/native references to the .NET objects.
Sometimes you do want to retain C# objects from C++ or vice versa i.e. keep them alive after the function/method returns. An idiomatic solution for these use cases is COM interop. IUnknown interface (a base interface for the rest of COM interfaces) allows to retain/release things across languages.
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Experimental Nintendo Switch Emulator written in C#
C++ interop is not supported in modern .NET out of the box, but wasn't too hard to implement as a library: https://github.com/Const-me/ComLightInterop
What are some alternatives?
pybind11 - Seamless operability between C++11 and Python
Ryujinx - Experimental Nintendo Switch Emulator written in C#
awesome-cython - A curated list of awesome Cython resources. Just a draft for now.
miniserde - Data structure serialization library with several opposite design goals from Serde
Nuitka - Nuitka is a Python compiler written in Python. It's fully compatible with Python 2.6, 2.7, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 3.10, and 3.11. You feed it your Python app, it does a lot of clever things, and spits out an executable or extension module.
mach - zig game engine & graphics toolkit
matplotlibcpp17 - Alternative to matplotlibcpp with better syntax, based on pybind
sapio - A Bitcoin Programming Language
epython - EPython is a typed-subset of the Python for extending the language new builtin types and methods
pfr - std::tuple like methods for user defined types without any macro or boilerplate code
avendish - declarative polyamorous cross-system intermedia objects
mach-glfw-vulkan-example - mach-glfw Vulkan example