Make sure that you are ASN.1/C compiling with the -c++ option. This should be specified on the ASN.1 compiler command line. If you have done that then make sure the resulting output to be compiled as C++ source has a file extension of .cpp, not .c.
This can be done by either renaming the generated .c file to a .cpp file manually or by specifying the -cont name.cpp option if using the SOED, or the -code name.cpp if using the TOED, or use an appropriate C++ compiler option (if available) to force C++ compilation even though the extension is not .cpp. In VC++ this is the /TP option. For more information, see the description of the -soedFile and -toedFile compiler options.
The samples included with some of the Knowledge Center answers are meant for your general understanding of the OSS products. Different versions of the products might produce slightly different outputs. Consult the products documentation and samples for the most up-to-date products information and code examples.
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