如何将多个参数合并为一个 SWIG 参数 [英] How can I collapse multiple arguments into one SWIG parameter

问题描述

我正在尝试编写一个将多个/可变参数转换为一个输入参数的类型映射.

I'm trying to write a typemap that converts multiple/variable arguments into one input parameter.

例如，假设我有一个接受向量的函数.

For example, say I have a function that takes a vector.

void foo(vector<int> x);

我想这样称呼它(碰巧是在 Perl 中)

And I want to call it like this (happens to be in Perl)

foo(1,2,3,4);

typemap 应该接受参数 ($argnum, ...)，将它们收集到一个向量中，然后将其传递给 foo.

The typemap should take arguments ($argnum, ...), gather them into one vector and then pass that to foo.

到目前为止我有这个:

typedef vector<int> vectori;
%typemap(in) (vectori) {
  for (int i=$argnum-1; i<items; i++) {
      $1->push_back( <argv i> );   // This is language dependent, of course.
  }
}

这会起作用，只是 SWIG 检查参数的数量

This would work, except that SWIG checks the number of arguments

if ((items < 1) || (items > 1)) {
  SWIG_croak("Usage: foo(vectori);");
}

如果我这样做:

 void foo(vectori, ...);

SWIG 将期望使用两个参数调用 foo.

SWIG will expect to call foo with two arguments.

 foo(arg1, arg2);

也许有一种方法可以告诉 SWIG 从对 foo 的调用中抑制 arg2?

Perhaps there's a way to tell SWIG to suppress arg2 from the call to foo?

我不能在我的 .i 中使用它:

I can't use this in my .i:

void foo(...)

因为我想要不同的类型映射，这取决于 foo 期望的类型(int 数组、字符串数组等等).也许有一种方法可以为..."提供类型

because I want to have different typemaps, depending on the types that foo is expecting (an array of int, strings, whatever). Maybe there's a way to give a type to "..."

有没有办法做到这一点?

Is there a way to do this?

推荐答案

SWIG 内置了对某些 STL 类的支持.为您的 SWIG .i 文件试试这个:

SWIG has built-in support for some STL classes. Try this for your SWIG .i file:

%module mymod

%{
#include <vector>
#include <string>
void foo_int(std::vector<int> i);
void foo_str(std::vector<std::string> i);
%}

%include <std_vector.i>
%include <std_string.i>
// Declare each template used so SWIG exports an interface.
%template(vector_int) std::vector<int>;
%template(vector_str) std::vector<std::string>;

void foo_int(std::vector<int> i);
void foo_str(std::vector<std::string> i);

然后使用所选语言的数组语法调用它:

Then call it with array syntax in the language of choice:

#Python
import mymod
mymod.foo_int([1,2,3,4])
mymod.foo_str(['abc','def','ghi'])

这篇关于如何将多个参数合并为一个 SWIG 参数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！