Some tests are reduced to single cpp.

cpp/multiple_derivation.cpp

@@ -0,0 +1,123 @@
+
+#include <stdio.h>
+#include <windows.h>
+
+class a
+{
+public:
+	virtual void f() = 0;
+};
+
+class b : public virtual a
+{
+public:
+	virtual void g() = 0;
+};
+
+class c : public virtual a
+{
+	int n;
+
+public:
+	c()
+	{ n = 0; }
+
+	virtual void f()
+	{ ++n; }
+};
+
+class d : public b, public c
+{
+public:
+//	virtual void f()
+//	{
+//		c::f();
+//	}
+
+	virtual void g()
+	{
+		puts( "d::g()" );
+	}
+};
+
+class a2
+{
+public:
+	virtual void f() = 0;
+};
+
+class b2 : public virtual a
+{
+public:
+	virtual void g() = 0;
+};
+
+class c2 : public a2
+{
+	int n;
+
+public:
+	c2()
+	{ n = 0; }
+
+	virtual void f()
+	{ ++n; }
+};
+
+class d2 : public b2, public c2
+{
+public:
+	virtual void f()
+	{
+		c2::f();
+	}
+
+	virtual void g()
+	{
+		puts( "d::g()" );
+	}
+};
+
+
+int main(int argc, const char * argv[])
+{
+	const int nAmount = 1000000000;
+
+	d o;
+	d2 o2;
+
+	int nWins1 = 0;
+	int nWins2 = 0;
+
+	//for ( ; true ; )
+	{
+		DWORD dwStart = GetTickCount();
+
+		for ( register int n = nAmount; n; --n )
+			o.f();
+		
+		DWORD dwDuration = GetTickCount() - dwStart;
+		printf( "Virtual inheritence takes %dms\n", dwDuration );
+
+
+
+		DWORD dwStart2 = GetTickCount();
+
+		for ( register int n = nAmount; n; --n )
+			o2.f();
+		
+		DWORD dwDuration2 = GetTickCount() - dwStart2;
+		printf( "Redirection of function %dms\n", dwDuration2 );
+
+		if ( dwDuration2 > dwDuration )
+			++nWins1;
+		else
+			++nWins2;
+
+		printf( "count %d : %d\n\n", nWins1, nWins2 );
+	}
+
+
+	return 0;
+}
+