c – SWIG：映射typedef的数组

我正在使用SWIG为某些C类创建Ruby Wrapper.这是C方法的签名,这给我带来了麻烦：

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

这是VocabIndex的定义：

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

这是我从Ruby脚本调用它的方式：

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

这是我运行脚本时遇到的错误：

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>'

我试图解决的问题

在阅读了docs之后(是的,我正在使用SWIG 2.0),我在我的.i文件中尝试了这个：

%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);

swig命令运行正常,但是当我尝试构建包装器库时,我得到了这个：

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

所以我启动了一个终端(这是一个Ubuntu盒子)并运行：

sudo apt-get install tcl-dev

这安装了tcl 8.6,它将其头文件放在/usr/include/tcl8.6目录中.所以我在Makefile行中添加了include目录,它构建了NgramWrapper_wrap.o：

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

但是,我仍然遇到构建错误.而这就是我难倒的地方：

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);

我能想到的只是Ruby,Swig和Tcl之间的版本不匹配.但是我怎么知道使用哪个Tcl版本？我搜索文档无济于事……

解决方法:

嗯.

我刚刚做了以下事情

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);
};

命令已执行

swig2.0 -ruby -c vocal.i

其次是

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

没有任何错误.你忘了-c选项,为什么需要tcl.h

原文地址：https://codeday.me/bug/20190702/1357908.html

c – SWIG：映射typedef的数组

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