调用“引用了外部库的多文件C ++代码".在R中 [英] Call "multi file C++ code with external libraries referenced" in R

问题描述

我已经用C ++编写了一个代码，该代码使用了boost库并且还使用了多个文件.我正在尝试在R中执行该功能.

I have written a code in C++ which uses boost library and also uses multiple files. I am trying to execute the function in R.

这是我的C ++函数原型:

Here is my C++ function prototype:

extern "C" double function1(double rho, double mu, double limit);

这是我的R函数:

dyn.load('path_to_dll\\x64\\Debug\\project.dll') 
.Call("function1", as.double(1.0), mu = as.double(1.0/20.0), limit = as.double(3413.85))

当我调用函数时，它给我以下错误:

When I am calling the function, it gives me following error:

Error in .Call("function1", as.double(1), mu = as.double(1/20),  : 
  C symbol name "function1" not in load table

我已遵循此但是没有运气.我要去哪里错了?

I have followed this But no luck. Where am I going wrong?

推荐答案

由于这是一个多文件C ++项目，因此应将代码打包为R包.使用Rcpp实际上很容易，请参见例如此答案. Rcpp-package 插图包含更多信息.另外，使用 boost 的一种简单方法是通过 BH软件包.您可以研究很多在CRAN上使用Rcpp + BH的示例程序包，例如我自己的 dqrng .您还可以在 R包以及官方文档中找到更多详细信息.编写R扩展.

Since this a multi-file C++ project, you should package the code as an R package. It is actually quite easy to do using Rcpp, see for example this answer. The Rcpp-package vignette contains further information. In addition, an easy way to make use of boost is via the BH package. There are many example packages for using Rcpp + BH on CRAN which you can study, e.g. my own dqrng. Some more details can also be found in the R Packages book and of course in the official documentation Writing R Extensions.

使用BH软件包的关键是 DESCRIPTION 文件中的 LinkingTo:BH .这确保了 -I< path_to_BH_package>/include 是编译器标志的一部分.为了使用放置在 inst/include 中的头文件，应将 PKG_CPPFLAGS = -I ../inst/include 添加到 src/Makevars .

The crucial thing for using the BH package is LinkingTo: BH in the DESCRIPTION file. This ensures that -I<path_to_BH_package>/include is part of the compiler flags. In order to use header files that you place in inst/include, you should add PKG_CPPFLAGS = -I../inst/include to src/Makevars.

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