延长“不完整的”类型（夜风）

问题描述

我正在寻找一种方法来扩展（即使用％新成员添加到一个类型延伸指令），该库文件本身的定义，同时该库的头文件只提供了一个向前声明类型类型。

I'm looking for a way to extend (i.e. add new members to a type using the %extend directive) a type that is defined in the library file itself while the header files of the library provide only a forward declaration for the type.

治疗的类型，如果它的定义是在编译时已知，会导致以下警告：

Treating the type as if its definition is known at compile time, leads to the following warning:

Warning 303: %extend defined for an undeclared class [name of the type].

是任何人都知道一个解决方案或替代方法这一问题的？我敢肯定有一个，因为SWIG的文档指出痛饮假定未知类型是一个结构或联合各找到一个时间。

Is anyone aware of a solution or a workaround for this problem? I'm sure there is one, since SWIG's documentation states that swig assumes that the unknown type is a struct or a union each time it finds one.

提前感谢！

推荐答案

您可以很方便地添加额外的方法已经在痛饮给它一个空定义的接口，例如向前声明的类型。

You can very easily add extra methods to a type which has been forward declared in SWIG by giving it an empty definition in the interface, e.g.

test.h：

// Forward declare foo
struct foo;

test.i：

test.i:

%module test

// Tell SWIG to wrap foo "properly", but that you don't know anything about it:
struct foo { };

%include "test.h"

%extend foo {
  void bar() {
    // Do stuff, probably with $self, here
  }
}

最关键的是，在你没有真正通常意义上的写作C或C ++接口文件，你告诉SWIG什么类型和包装了每个类型的部分。

The key is that in the interface file you're not actually writing C or C++ in the normal sense, you're telling SWIG what types and what parts of each type to wrap.

既然你将presumably依托图书馆创建和销毁情况下，你还需要添加：

Since you will presumably be relying on the library to create and destroy instances you'll also want to add:

%nodefaultctor foo;
%nodefaultdtor foo;

在接口文件共进晚餐preSS构造函数/析构函数生成并迫使它要经过图书馆。

In the interface file to suppress the constructor/destructor generation and force it to go through the library.

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