SWIG：映射typedef的數組

Question

我正在使用SWIG爲一些C++類創建一個Ruby包裝器。這是這是給我找麻煩了C++方法的簽名：

virtual LogP wordProb(VocabIndex word, const VocabIndex *context); 

這是VocabIndex的定義：

#ifdef USE_SHORT_VOCAB 
typedef unsigned short VocabIndex; 
#else 
typedef unsigned int VocabIndex; 
#endif 

這是我從Ruby腳本調用的方式：

index = 8 
context = [index] 
puts ngram.wordProb(index, context) 

這是我得到的錯誤，當我運行我的腳本：

ngram.rb:26:in `wordProb': Expected argument 2 of type VocabIndex const *, but got Array [8] (TypeError) 
    in SWIG method 'wordProb' 
    from ngram.rb:26:in `<main>' 

我嘗試的解決方案：

看完後的docs（是的，我使用痛飲2.0），我在.i文件試過這樣：

%module rubylm 

%{ 
#include "srilm-1.7.1/lm/src/Ngram.h" 
%} 

%include "srilm-1.7.1/lm/src/Counts.h" 
%include "srilm-1.7.1/lm/src/Ngram.h" 
%include "typemaps.i" 

virtual LogP Ngram::wordProb(VocabIndex word, const VocabIndex *INPUT); 

的痛飲命令運行正常，但是當我試圖建立的包裝庫，我得到這個：

NgramWrapper_wrap.cxx:148:17: fatal error: tcl.h: No such file or directory 
#include <tcl.h> 

所以我啓動了一個終端（這是一個Ubuntu盒），跑：

sudo apt-get install tcl-dev 

安裝了tcl 8.6，它將頭文件放在/usr/include/tcl8.6目錄中。所以，我補充說，包括Makefile行它建立NgramWrapper_wrap.o目錄：

NgramWrapper_wrap.o: NgramWrapper_wrap.cxx 
    $(CC) $(CFLAGS) NgramWrapper_wrap.cxx -I $(RUBY_SRC) -I $(MISC_INCLUDE) -I $(DSTRUCT_INCLUDE) -I /usr/include/tcl8.6 

不過，我仍然得到編譯錯誤。這裏是我被困住的地方：

NgramWrapper_wrap.cxx:10812:34: error: ‘RARRAY_LEN’ was not declared in this scope 
    int size = RARRAY_LEN(objv[3]); 
           ^
NgramWrapper_wrap.cxx:10816:5: error: ‘VALUE’ was not declared in this scope 
    VALUE *ptr = RARRAY_PTR(objv[3]); 
    ^
NgramWrapper_wrap.cxx:10816:12: error: ‘ptr’ was not declared in this scope 
    VALUE *ptr = RARRAY_PTR(objv[3]); 
      ^
NgramWrapper_wrap.cxx:10816:36: error: ‘RARRAY_PTR’ was not declared in this scope 
    VALUE *ptr = RARRAY_PTR(objv[3]); 
            ^
NgramWrapper_wrap.cxx:10819:35: error: ‘StringValuePtr’ was not declared in this scope 
     arg3[i]= StringValuePtr(*ptr); 
           ^
NgramWrapper_wrap.cxx: In function ‘int _wrap_NgramCountWrapper_run(ClientData, Tcl_Interp*, int, Tcl_Obj* const*)’: 
NgramWrapper_wrap.cxx:10908:34: error: ‘RARRAY_LEN’ was not declared in this scope 
    int size = RARRAY_LEN(objv[3]); 
           ^
NgramWrapper_wrap.cxx:10912:5: error: ‘VALUE’ was not declared in this scope 
    VALUE *ptr = RARRAY_PTR(objv[3]); 
    ^
NgramWrapper_wrap.cxx:10912:12: error: ‘ptr’ was not declared in this scope 
    VALUE *ptr = RARRAY_PTR(objv[3]); 
      ^
NgramWrapper_wrap.cxx:10912:36: error: ‘RARRAY_PTR’ was not declared in this scope 
    VALUE *ptr = RARRAY_PTR(objv[3]); 
            ^
NgramWrapper_wrap.cxx:10915:35: error: ‘StringValuePtr’ was not declared in this scope 
     arg3[i]= StringValuePtr(*ptr); 

我能想到的是Ruby，Swig和Tcl之間的一些版本不匹配。但是我怎麼知道使用哪個Tcl版本？我搜索文檔無濟於事...

Answer 1

嗯。

我只是做了以下

vocal.i

%module rubylm 

%{ 
#include "Ngram.h" 
%} 

%include "Ngram.h" 
%include "typemaps.i" 

virtual LogP Ngram::wordProb(VocabIndex word, const VocabIndex *INPUT); 

Ngram.h

#pragma once 

#ifdef USE_SHORT_VOCAB 
typedef unsigned short VocabIndex; 
#else 
typedef unsigned int VocabIndex; 
#endif 

typedef int LogP; 

class NGram { 
public: 
    LogP wordProb(VocabIndex word, const VocabIndex *context); 
}; 

命令執行

swig2.0 -ruby -c++ vocal.i

FO通過

g++ -c vocal_wrap.cxx -I/usr/include/ruby-2.1.0 -I/usr/include/x86_64-linux-gnu/ruby-2.1.0

llowed沒有任何錯誤。你忘了-C++選項，爲什麼你需要tcl.h