cxx | Safe interop between Rust and C++

by dtolnay Rust Version: 1.0.95 License: Apache-2.0

X-Ray Key Features Code Snippets Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | cxx Summary

cxx is a Rust library. cxx has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can download it from GitHub.

The idea is that we define the signatures of both sides of our FFI boundary embedded together in one Rust module (the next section shows an example). From this, CXX receives a complete picture of the boundary to perform static analyses against the types and function signatures to uphold both Rust’s and C++'s invariants and requirements. If everything checks out statically, then CXX uses a pair of code generators to emit the relevant extern "C" signatures on both sides together with any necessary static assertions for later in the build process to verify correctness. On the Rust side this code generator is simply an attribute procedural macro. On the C++ side it can be a small Cargo build script if your build is managed by Cargo, or for other build systems like Bazel or Buck we provide a command line tool which generates the header and source file and should be easy to integrate. The resulting FFI bridge operates at zero or negligible overhead, i.e. no copying, no serialization, no memory allocation, no runtime checks needed. The FFI signatures are able to use native types from whichever side they please, such as Rust’s String or C's std::string, Rust’s Box or C's std::unique_ptr, Rust’s Vec or C's std::vector, etc in any combination. CXX guarantees an ABI-compatible signature that both sides understand, based on builtin bindings for key standard library types to expose an idiomatic API on those types to the other language. For example when manipulating a C string from Rust, its len() method becomes a call of the size() member function defined by C; when manipulating a Rust string from C, its size() member function calls Rust’s len().

Support

Quality

Security

License

Reuse

Support

cxx has a medium active ecosystem.

It has 4791 star(s) with 283 fork(s). There are 50 watchers for this library.

It had no major release in the last 12 months.

There are 181 open issues and 381 have been closed. On average issues are closed in 72 days. There are 30 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of cxx is 1.0.95

Quality

cxx has 0 bugs and 0 code smells.

Security

cxx has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

cxx code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

cxx is licensed under the Apache-2.0 License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

cxx releases are available to install and integrate.

Installation instructions, examples and code snippets are available.

It has 35 lines of code, 0 functions and 2 files.

It has low code complexity. Code complexity directly impacts maintainability of the code.

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cxx Key Features

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cxx Examples and Code Snippets

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Community Discussions

Trending Discussions on cxx

Unknown host CPU architecture: arm64 , Android NDK SiliconM1 Apple MacBook Pro

module 'numpy.distutils.__config__' has no attribute 'blas_opt_info'

package io/fs is not in GOROOT while building the go project

'GetContents' in 'v8::ArrayBuffer'

How to register QObject class in CMake with qt_add_qml_module?

How to get UniquePtr on the Rust side? (CXX crate)

How can I correctly create a C++ vector in Python3 by swig?

Cmake: using conan pybind11 package

Can't move std::packaged_task into a lambda

Call C++ Hello World from Julia

QUESTION

Unknown host CPU architecture: arm64 , Android NDK SiliconM1 Apple MacBook Pro

Asked 2022-Apr-04 at 18:41

I've got a project that is working fine in windows os but when I switched my laptop and opened an existing project in MacBook Pro M1. I'm unable to run an existing android project in MacBook pro M1. first I was getting

Execution failed for task ':app:kaptDevDebugKotlin'. > A failure occurred while executing org.jetbrains.kotlin.gradle.internal.KaptExecution > java.lang.reflect.InvocationTargetException (no error message)

this error was due to the Room database I applied a fix that was adding below library before Room database and also changed my JDK location from file structure from JRE to JDK.

kapt "org.xerial:sqlite-jdbc:3.34.0"

...

ANSWER

Answered 2022-Apr-04 at 18:41

To solve this on a Apple Silicon M1 I found three options

Use NDK 24

Source https://stackoverflow.com/questions/69541831

QUESTION

module 'numpy.distutils.__config__' has no attribute 'blas_opt_info'

Asked 2022-Mar-17 at 10:50

I'm trying to study the neural-network-and-deep-learning (http://neuralnetworksanddeeplearning.com/chap1.html). Using the updated version for Python 3 by MichalDanielDobrzanski (https://github.com/MichalDanielDobrzanski/DeepLearningPython). Tried to run it in my command console and it gives an error below. I've tried uninstalling and reinstalling setuptools, theano, and numpy but none have worked thus far. Any help is very appreciated!!

Here's the full error log:

...

ANSWER

Answered 2022-Feb-17 at 14:12

I had the same issue and solved it downgrading numpy to version 1.20.3 by:

Source https://stackoverflow.com/questions/70839312

QUESTION

package io/fs is not in GOROOT while building the go project

Asked 2022-Mar-14 at 19:15

I don't have much experience in go but I have been tasked to execute a go project :)

So i need to build the go project and then execute it

Below is the error when i build the go project. Seems to be some dependency(package and io/fs) is missing

...

ANSWER

Answered 2021-Aug-12 at 05:56

This package requires go v1.16, please upgrade your go version or use the appropriate docker builder.

Source https://stackoverflow.com/questions/68752103

QUESTION

'GetContents' in 'v8::ArrayBuffer'

Asked 2022-Mar-11 at 16:42

I'm using Mac M1 and I've just upgraded to Node 14.17.6LTS.

I tried to rebuild better_sqlite3 (7.4.3) using with electron builder (22.11.7) and I'm getting the following errors:

no member named 'GetContents' in 'v8::ArrayBuffer'

Any ideas how to solve this? Thanks in advance!

...

ANSWER

Answered 2021-Sep-23 at 01:15

I'm using Mac M1 and I've just upgraded to Node 14.17.6LTS.

An interesting choice, given that Node 16 officially introduced M1 support.

no member named 'GetContents' in 'v8::ArrayBuffer'

See this doc. In short, GetContents was replaced by GetBackingStore in late 2019. Being a compatibility layer, nan adapted to this in early 2020.

So you'll probably have to ensure that the versions of all involved packages (Node, nan, electron, ...) match each other (in the sense of having been released around the same time and targeting each other).

Source https://stackoverflow.com/questions/69290893

QUESTION

How to register QObject class in CMake with qt_add_qml_module?

Asked 2022-Feb-21 at 07:35

I have a QObject derived class Expense that I use in QML like this.

...

ANSWER

Answered 2022-Feb-21 at 07:35

You just need to add QML_ELEMENT to your QObject-derived Expense class's header and make sure you have moc enabled in your CMakeLists.txt. In application case it doesn't matter if the expense.h/cpp sources are included via qt_add_executable or qt_add_qml_module. I think it's clearer to add them to qt_add_qml_module SOURCES. Then you just import module URI in you QML file. In the example below I'm printing out property value from Expense object in QML.

CMakeLists.txt

Source https://stackoverflow.com/questions/71182775

QUESTION

How to get UniquePtr on the Rust side? (CXX crate)

Asked 2022-Jan-27 at 20:47

Using the cxx crate: https://crates.io/crates/cxx

I have the following struct on Rust:

...

ANSWER

Answered 2022-Jan-27 at 20:47

Try adding:

Source https://stackoverflow.com/questions/70884432

QUESTION

How can I correctly create a C++ vector in Python3 by swig?

Asked 2022-Jan-22 at 19:25

I try to test swig library 'std_vector.i', but I can't create a vector in Python3 like official demo, Here is some information.

swig_test.i

...

ANSWER

Answered 2022-Jan-22 at 19:25

The problem here is how you're importing and using the module you've built.

When you ran SWIG as well as generating some C++ code it also generated some Python too. Rather than directly access the native module you want to access it via the generated python instead, e.g.

Source https://stackoverflow.com/questions/70812077

QUESTION

Cmake: using conan pybind11 package

Asked 2022-Jan-01 at 14:53

I'm having trouble understanding how to use pybind11 conan package. I can use some others, but pybind11 is giving me hard time.

My starting point is as follows:

conanfile.txt:

...

ANSWER

Answered 2021-Nov-08 at 15:48

I have used pybind in the past (two or three years ago) and it worked without problems with conan. However, I tried to install it now and faced similar problems. This might be related to the evolution of conan towards conan 2.0 (an alpha version was released today) and that the recipe was not updated to account changes.

An alternative that you might consider, is to install pybind with conan using a different generator. More specifically, the CMakeDeps generator. With the CMakeDeps generator conan will create a pybind11-config.cmake file for you and you just need to use find_package(pybind11 REQUIRED) in CMakeLists.txt. That is, there is no "conan specific stuff" in your CMakeLists.txt file.

conanfile.txt

Source https://stackoverflow.com/questions/69781924

QUESTION

Can't move std::packaged_task into a lambda

Asked 2021-Dec-29 at 22:51

I want to defer the execution of a packaged task in a loop.

...

ANSWER

Answered 2021-Dec-29 at 13:52

By default a lambda's call operator is const-qualified.

Inside the lambda's body the this pointer to the lambda is therefore also const-qualified and so is the member wrapper. std::packaged_task does not have a const-qualified operator(), so it cannot be called.

You can make the lambda's operator() non-const-qualified by adding the mutable keyword:

Source https://stackoverflow.com/questions/70519893

QUESTION

Call C++ Hello World from Julia

Asked 2021-Dec-22 at 11:14

I have a C++ program that parses a binary file and outputs a std::string. I would like to call this function directly from Julia and convert the steam into a DataFrame. I need it to work in Linux and Windows. Currently, I have the program write the output to a text file, and then I read it into Julia. Cxx is no longer supported, and trying to get CxxWrap to work has been an exercise in frustration.

Toy Problem: If someone could show me how to call the code below from Julia, that would be awesome.

...

ANSWER

Answered 2021-Dec-22 at 11:14

There's a new package which might fit your needs here:

https://github.com/eschnett/CxxInterface.jl

It is intended as a successor to Cxx.jl and more stable, so I'd recommend giving it ago although I haven't tried it myself!

Source https://stackoverflow.com/questions/70424712

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install cxx

For builds that are orchestrated by Cargo, you will use a build script that runs CXX’s C code generator and compiles the resulting C code along with any other C++ code for your crate. The canonical build script is as follows. The indicated line returns a [cc::Build] instance (from the usual widely used cc crate) on which you can set up any additional source files and compiler flags as normal.
For use in non-Cargo builds like Bazel or Buck, CXX provides an alternate way of invoking the C++ code generator as a standalone command line tool. The tool is packaged as the cxxbridge-cmd crate on crates.io or can be built from the gen/cmd directory of this repo.

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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