当库使用模板(泛型)时，是否可以使用Rust的C ++库? [英] Is it possible to use a C++ library from Rust when the library uses templates (generics)?

问题描述

当库(例如 Boost )使用模板(泛型)时，是否可以使用Rust提供的C ++库?

Is it possible to use a C++ library from Rust when the library (e.g. Boost) uses templates (generics)?

推荐答案

是，但可能不是实用.

D编程语言是提供某种程度的C ++互操作性的极少数语言之一.您可以在 dlang 上了解有关此内容的更多信息.

The D programming language is one of the very few providing some degree of C++ interoperability; you can read more about it on dlang.

请注意模板部分的限制:

Note the limitation for the template section:

请注意，必须通过链接到C ++目标代码或包含这些实例的共享库来提供D代码中使用的所有实例.

Note that all instantiations used in D code must be provided by linking to C++ object code or shared libraries containing the instantiations.

从本质上讲，这意味着您必须使用C ++代码来生成具有正确类型的模板的实例，然后D编译器将针对这些实例进行链接.

which essentially means that you must use C++ code to cause the instantiation of the templates with the right types, and then the D compiler will link against those instantiations.

您可以对Rust进行相同的操作.如果没有编译器支持，则意味着手动修改名称.在"FFI"部分中，您会找到链接属性:

You could do the same for Rust. Without compiler support, this means mangling the names manually. In the FFI section, you will find the link attribute:

#[link(name = "snappy")]
extern {
    fn snappy_max_compressed_length(source_length: size_t) -> size_t;
}

告诉编译器哪个链接库将提供符号，您还将支持各种调用约定和

which tells the compiler which linked library will provide the symbol, you will also support for various calling conventions and the no_mangle attribute.

您可能需要适当地应用#[allow(non_snake_case)] .

You may need to apply #[allow(non_snake_case)] as appropriate.

Servo使用 bindgen 为C和C ++代码生成Rust绑定；我对C ++的支持程度还不清楚，并且对它是否可以处理模板有些怀疑.

Servo uses bindgen to generate Rust bindings for C and C++ code; I am unclear on the level of C++ support, and somewhat doubtful that it can handle templates.

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