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POHow to create passable from C# into C++ delegate that takes a IEnumerable as argument with SWIG?
 

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  1. POHow to create passable from C# into C++ delegate that takes a IEnumerable as argument with SWIG?
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    <p>So I have next C++ code:</p> <pre><code>#ifdef WIN32 # undef CALLBACK # define CALLBACK __stdcall #else # define CALLBACK #endif #include &lt;iostream&gt; #include &lt;vector&gt; namespace OdeProxy { typedef std::vector&lt; double &gt; state_type; typedef void (CALLBACK *System)( const state_type &amp;, state_type &amp;, const double); typedef void (CALLBACK *Observer)( const state_type &amp;, double); class Ode { public: state_type initialConditions; System system; Observer observer; double from; double to; double step; }; } </code></pre> <p>And .i file:</p> <pre><code>/* File : MyProject.i */ %module MyProject %{ #include "C++/OdeProxy.h" %} %include "std_vector.i" %include "C++/OdeProxy.h" %template(state_type) std::vector&lt;double&gt;; //// Delegate realated stuff //// %typemap(cstype) void (*)( const state_type &amp;, state_type &amp;, const double) "SystemDelegate"; %typemap(imtype) void (*)( const state_type &amp;, state_type &amp;, const double) "SystemDelegate"; %typemap(cstype) void (*)( const state_type &amp;, double) "ObserverDelegate"; %typemap(imtype) void (*)( const state_type &amp;, double) "ObserverDelegate"; </code></pre> <p>I created being inspired by this <a href="http://permalink.gmane.org/gmane.comp.programming.swig/5795" rel="noreferrer">thread</a>. Code gets generated. </p> <p>Yet I can not understand how to get code like</p> <pre><code>using OdeLibrary; namespace OdeTest { class Program { static void Main(string[] args) { //var lam = new OdeLibrary.SWIGTYPE_p_f_r_q_const__std__vector__double___double__void() var ode = new Ode{ from = 0, to = 10, initialConditions = new state_type(new[]{1,2,3}), step = 0.01, observer = (x, dxdt, t) =&gt; { return; } }; } } } </code></pre> <p>compile. Error:</p> <pre><code>Error Cannot convert lambda expression to type 'OdeLibrary.SWIGTYPE_p_f_r_q_const__std__vector__double___double__void' because it is not a delegate type </code></pre> <p>Where<code>SWIGTYPE_p_f_r_q_const__std__vector__double___double__void</code> looks like this:</p> <pre><code>/* ---------------------------------------------------------------------------- * This file was automatically generated by SWIG (http://www.swig.org). * Version 2.0.9 * * Do not make changes to this file unless you know what you are doing--modify * the SWIG interface file instead. * ----------------------------------------------------------------------------- */ namespace OdeLibrary { using System; using System.Runtime.InteropServices; public class SWIGTYPE_p_f_r_q_const__std__vector__double___double__void { private HandleRef swigCPtr; internal SWIGTYPE_p_f_r_q_const__std__vector__double___double__void(IntPtr cPtr, bool futureUse) { swigCPtr = new HandleRef(this, cPtr); } protected SWIGTYPE_p_f_r_q_const__std__vector__double___double__void() { swigCPtr = new HandleRef(null, IntPtr.Zero); } internal static HandleRef getCPtr(SWIGTYPE_p_f_r_q_const__std__vector__double___double__void obj) { return (obj == null) ? new HandleRef(null, IntPtr.Zero) : obj.swigCPtr; } } } </code></pre> <p>So I wonder what shall be changed in <code>.i</code> file or added to c# generated wrapper to get the ability to pass my C# lambda to C++ class as delegate?</p>
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    1. COHave you tried just `new Func<>` instead of a lambda?
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    2. COWhat abuut creation of inheritable `Ode` with `protected` `virtual`members `system` and `observer`, overload tham in C# implementation and provide `get`/`set` for `public` `System`/`Observer` `Actions<IEnumerable...>`?
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