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    <p>You can't actually export C++ classes directly like this.</p> <pre><code>static extern void functionFromClass(); </code></pre> <p>The problem with C++ is that it doesn't have a universally defined ABI (Application binary interface). So In order to make other languages understand your C++ library ABI you need to wrap it with C functions (almost every other language understands C).</p> <p>The problem with C is that it doesn't understand classes. On the other hand, C++ Objects need to pass <code>this</code> pointer as a parameter to their member functions. So in order to wrap your C++ classes with C interface. You need to handle passing <code>this</code> parameter explicitly and also define functions similar to the constructor and destructor. </p> <p>You need to do sth like this:</p> <pre><code>//Header File Foo.h struct Foo; // Forward Declaration Only Foo* createFoo( /* parameters */ ); void destroyFoo( Foo* obj ); int Func( Foo* obj, int i ); // obj should take this pointer float Func2( Foo* obj, float i, float j ); </code></pre> <p>Implement it like this</p> <pre><code>#include "Foo.h" extern "C" { Foo* createFoo( const char * s ) { return reinterpret_cast&lt;Foo*&gt;( new Foo( s ) ); } void destroyFoo( Foo* obj ) { delete reinterpret_cast&lt;Foo*&gt;(obj ); } int Func( Foo* obj, int i ) { return reinterpret_cast&lt;Foo*&gt;(obj)-&gt;Func(i); } } </code></pre> <p>Finally you can wrap your exported C function in a C# class so things get back to the traditional object oriented way.</p> <p>Notice that I didn't even mention Inheritance or polymorphism.</p>
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