当我“获取”文件时，将编译此最小示例：
/*
read_header.c
*/
#include <stdio.h>
#include <stdlib.h>
#include <RcppCommon.h>
typedef struct {
int my_data;
} MY_HEADER_INFO;
namespace Rcpp {
template <> SEXP wrap(const MY_HEADER_INFO& x);
}
#include <Rcpp.h>
namespace Rcpp {
template <>
SEXP wrap(const MY_HEADER_INFO& x) {
std::vector<std::string> names;
std::vector<SEXP> elements(1);
// do something with the elements and names
names.push_back("my_data");
elements[0] = Rcpp::wrap( x.my_data );
};
}
//' @export
// [[Rcpp::export]]
MY_HEADER_INFO read_header() {
MY_HEADER_INFO *header;
header = (MY_HEADER_INFO*)malloc(sizeof(MY_HEADER_INFO));
memset(header, 0, sizeof(MY_HEADER_INFO));
return *header;
}
当我尝试在RStudio中将其构建到一个程序包（CMD + SHIFT + B）中时，我收到以下很长的错误消息，该消息明确列出了问题是我的用户定义的返回结构MY_HEADER_INFO：
描述
Package: myPackage
Type: Package
Title: What the Package Does (Title Case)
Version: 0.1.0
Depends: R (>= 4.0.0)
License: GPL-3
Encoding: UTF-8
LazyData: true
RoxygenNote: 7.1.0
Imports:
Rcpp
Suggests:
knitr,
rmarkdown,
testthat
VignetteBuilder: knitr
LinkingTo:
Rcpp
名称空间
# Generated by roxygen2: do not edit by hand
export(read_header)
我收到以下错误：
==> Rcpp::compileAttributes()
* Updated src/RcppExports.cpp
* Updated R/RcppExports.R
==> devtools::document(roclets = c('rd', 'collate', 'namespace'))
Updating myPackage documentation
Loading myPackage
Re-compiling myPackage
─ installing *source* package ‘myPackage’ ...
** using staged installation
** libs
clang++ -mmacosx-version-min=10.13 -std=gnu++11 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I'/Library/Frameworks/R.framework/Versions/4.0/Resources/library/Rcpp/include' -I/usr/local/include -fPIC -Wall -g -O2 -UNDEBUG -Wall -pedantic -g -O0 -fdiagnostics-color=always -c RcppExports.cpp -o RcppExports.o
RcppExports.cpp:9:1: error: unknown type name 'MY_HEADER_INFO'
MY_HEADER_INFO read_header();
^
1 error generated.
make: *** [RcppExports.o] Error 1
ERROR: compilation failed for package ‘myPackage’
─ removing ‘/private/var/folders/gl/jvj9b0xn34lgq6_h9370p8q80000gn/T/RtmpLKsw0o/devtools_install_1f333d54be59/myPackage’
Error: System command 'R' failed, exit status: 1, stdout + stderr:
E> * installing *source* package ‘myPackage’ ...
E> ** using staged installation
E> ** libs
E> clang++ -mmacosx-version-min=10.13 -std=gnu++11 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I'/Library/Frameworks/R.framework/Versions/4.0/Resources/library/Rcpp/include' -I/usr/local/include -fPIC -Wall -g -O2 -UNDEBUG -Wall -pedantic -g -O0 -fdiagnostics-color=always -c RcppExports.cpp -o RcppExports.o
E> RcppExports.cpp:9:1: error: unknown type name 'MY_HEADER_INFO'
E> MY_HEADER_INFO read_header();
E> ^
E> 1 error generated.
E> make: *** [RcppExports.o] Error 1
E> ERROR: compilation failed for package ‘myPackage’
E> * removing ‘/private/var/folders/gl/jvj9b0xn34lgq6_h9370p8q80000gn/T/RtmpLKsw0o/devtools_install_1f333d54be59/myPackage’
Stack trace:
1. base:::suppressPackageStartupMessages({ ...
2. base:::withCallingHandlers(expr, packageStartupMessage = function(c) tryInv ...
3. devtools::document(roclets = c("rd", "collate", "namespace"))
4. withr::with_envvar(r_env_vars(), roxygen2::roxygenise(pkg$path, ...
5. base:::force(code)
6. roxygen2::roxygenise(pkg$path, roclets, load_code = load_code)
7. roxygen2:::load_code(base_path)
8. pkgload::load_all(path, helpers = FALSE, attach_testthat = FALSE)
9. pkgbuild::compile_dll(path, quiet = quiet)
10. withr::with_makevars(compiler_flags(TRUE), assignment = "+=", ...
11. withr:::with_envvar(c(R_MAKEVARS_USER = makevars_file), { ...
12. base:::force(code)
13. base:::force(code)
14. pkgbuild:::install_min(path, dest = install_dir, components = "libs", ...
15. pkgbuild:::rcmd_build_tools("INSTALL", c(path, paste("--library=", ...
16. pkgbuild:::with_build_tools(callr::rcmd_safe(..., env = env, ...
17. callr::rcmd_safe(..., env = env, spinner = FALSE, show = FALSE, ...
18. callr:::run_r(options)
19. base:::with(options, with_envvar(env, do.call(processx::run, ...
20. base:::with.default(options, with_envvar(env, do.call(processx::run, ...
21. base:::eval(substitute(expr), data, enclos = parent.frame())
22. base:::eval(substitute(expr), data, enclos = parent.frame())
23. callr:::with_envvar(env, do.call(processx::run, c(list(bin, args = real_cmd ...
24. base:::force(code)
25. base:::do.call(processx::run, c(list(bin, args = real_cmdargs, ...
26. (function (command = NULL, args = character(), error_on_status = TRUE, ...
27. throw(new_process_error(res, call = sys.call(), echo = echo, ...
x System command 'R' failed, exit status: 1, stdout + stderr:
E> * installing *source* package ‘myPackage’ ...
E> ** using staged installation
E> ** libs
E> clang++ -mmacosx-version-min=10.13 -std=gnu++11 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I'/Library/Frameworks/R.framework/Versions/4.0/Resources/library/Rcpp/include' -I/usr/local/include -fPIC -Wall -g -O2 -UNDEBUG -Wall -pedantic -g -O0 -fdiagnostics-color=always -c RcppExports.cpp -o RcppExports.o
E> RcppExports.cpp:9:1: error: unknown type name 'MY_HEADER_INFO'
E> MY_HEADER_INFO read_header();
E> ^
E> 1 error generated.
E> make: *** [RcppExports.o] Error 1
E> ERROR: compilation failed for package ‘myPackage’
E> * removing ‘/private/var/folders/gl/jvj9b0xn34lgq6_h9370p8q80000gn/T/RtmpLKsw0o/devtools_install_1f333d54be59/myPackage’
Execution halted
Exited with status 1.
将以下内容写入Rcpp_exports：
// Generated by using Rcpp::compileAttributes() -> do not edit by hand
// Generator token: 10BE3573-1514-4C36-9D1C-5A225CD40393
#include <Rcpp.h>
using namespace Rcpp;
// read_header
MY_HEADER_INFO read_header();
RcppExport SEXP _myPackage_read_header() {
BEGIN_RCPP
Rcpp::RObject rcpp_result_gen;
Rcpp::RNGScope rcpp_rngScope_gen;
rcpp_result_gen = Rcpp::wrap(read_header());
return rcpp_result_gen;
END_RCPP
}
static const R_CallMethodDef CallEntries[] = {
{"_myPackage_read_header", (DL_FUNC) &_myPackage_read_header, 0},
{NULL, NULL, 0}
};
RcppExport void R_init_myPackage(DllInfo *dll) {
R_registerRoutines(dll, NULL, CallEntries, NULL, NULL);
R_useDynamicSymbols(dll, FALSE);
}
但是，如果我尝试修改此文件，则当我调用CMD + SHIFT + B时，所有文件都会被覆盖。当我在控制台中“获取”代码以及将它们构建到程序包中时，我为同一程序包编写的其他返回标准数据类型（例如“ std :: vector”）的C程序都可以毫无问题地进行编译。
我已经阅读了Rcpp文档和相关的插图（甚至买了Dirk的书！），但是我找不到如何告诉程序包生成器MY_HEADER_INFO的定义所在的位置。如何告诉程序包编译器此文件的定义在哪里？
谢谢！
这看起来像是一个并非很罕见的问题的另一个实例，对此我们确实有一个非常简单的答案，而这个答案却鲜为人知。
简而言之，对于包<pkg>（<pkg>包名是别名，请根据需要使用小写或小写。显然不是<或>），请将此类struct（或在C ++情况下class）typedef或... ...定义放入文件中inst/include/<pkg>_types.h（替换<pkg>为您的包裹名称）。
如果存在这样的文件，它将自动包含在其中RcppExports.cpp，您可以使用。
详细信息在“ Rcpp属性”小插图中，并且还允许使用一些相关形式：
src/<pkg>_types.h
src/<pkg>_types.hpp
inst/include/<pkg>_types.h
inst/include/<pkg>_types.hpp
inst/include/<pkg>.h
但inst/include/<pkg>_types.h可能是最常用的一种。通过使用它的一个例子src/是SRC / RSQLite_types.h。在另一方面，在使用它的一个例子inst/include/是安装/包含/ RcppQuantuccia_types.h和另一个，更大的一个在安装/包含/ RcppGSL_types.h。
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我来说两句