Move all C++ tests to cpp.

cpp/test_static_double2.cpp

@@ -0,0 +1,15 @@
+#include <iostream>
+
+#include "test_static_double.h"
+
+int main2 ( void )
+{
+	A<int> a;
+	A<double> b;
+	
+	std::cout << a._st_double << std::endl;
+	std::cout << b._st_double << std::endl;
+
+	return 0;
+}
+