Abstract: A data structure and method for dynamic type resolution in mapping abstract syntax notation (ASN.1) onto an object-oriented programming language (C++). For each information object class in ASN.1, two C++ classes are generating, a "set class" that models information object sets in that ASN.1 class, and a "class class" that models information objects in that ASN.1 class. For each information object set in an ASN.1 module class, a C++ data member is defined and a virtual resolve method is generated that may be invoked during the decoding process to permit dynamic extension of each information object set. A coder environment is provided in C++ that has pointers to instances of the various C++ module classes, enabling selective control of the type resolution information presented to the decoder.