题
我正在按照RCPP Intro Vignette的示例进行示例,并使用Inline尝试。
f<-cxxfunction(signature(), plugin="Rcpp", body="
Environment global = Environment::global_env();
std::vector<double> vx = global['x'];
")
但是我得到了一个编译错误。
file12384509.cpp: In function 'SEXPREC* file12384509()':
file12384509.cpp:31: error: invalid use of incomplete type 'struct SEXPREC'
C:/PROGRA~1/R/R-211~1.1/include/Rinternals.h:333: error: forward declaration of 'struct SEXPREC'
file12384509.cpp:31: error: conversion from 'SEXPREC' to non-scalar type 'std::vector<double, std::allocator<double> >' requested
make: *** [file12384509.o] Error 1
ERROR(s) during compilation: source code errors or compiler configuration errors!
Program source:
1: // includes from the plugin
2:
3: #include <Rcpp.h>
4:
5:
6: #ifndef BEGIN_RCPP
7: #define BEGIN_RCPP
8: #endif
9:
10: #ifndef END_RCPP
11: #define END_RCPP
12: #endif
13:
14: using namespace Rcpp;
15:
16:
17: // user includes
18:
19:
20: // declaration
21: extern "C" {
22: SEXP file12384509( ) ;
23: }
24:
25: // definition
26:
27: SEXP file12384509( ){
28: BEGIN_RCPP
29:
30: Environment global = Environment::global_env();
31: std::vector<double> vx = global['x'];
32:
33: END_RCPP
34: }
35:
36:
Error in compileCode(f, code, language = language, verbose = verbose) :
Compilation ERROR, function(s)/method(s) not created! file12384509.cpp: In function 'SEXPREC* file12384509()':
file12384509.cpp:31: error: invalid use of incomplete type 'struct SEXPREC'
C:/PROGRA~1/R/R-211~1.1/include/Rinternals.h:333: error: forward declaration of 'struct SEXPREC'
file12384509.cpp:31: error: conversion from 'SEXPREC' to non-scalar type 'std::vector<double, std::allocator<double> >' requested
make: *** [file12384509.o] Error 1
怎么了,有没有办法解决此问题?这只是玩具示例,根据答案,我有一个更重要的复杂问题。
解决方案
感谢您对 RCPP呢罗曼(Romain)和我通常建议将问题提出在RCPP开展清单上;您可能会在那里得到一些合适的眼球。
在这里,您陷入了单个引号和双引号的陷阱。将这些转围使其全部起作用。我还在玩它时,我还重新排序 /重新排列 /重新标记了代码:
> f <- cxxfunction(signature(),
+ body=' Environment e = Environment::global_env();
+ std::vector<double> vx = e["x"];
+ return wrap(vx); ',
+ plugin="Rcpp")
> x <- 3:6
> f()
[1] 3 4 5 6
>
编辑: 就其价值而言,这里是一样的,但是将环境传播下来。那就是我首先玩的东西,我以某种方式更喜欢
f <- cxxfunction(signature(env="environment"),
body=' Environment e(env);
std::vector<double> vx = e["x"];
return wrap(vx); ',
plugin="Rcpp")
env <- new.env()
env[["x"]] <- 1:4
f(env)
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