Assembly models Part instance

Parts are modeled in the context of assembly. Associative part and assembly models help designers in understanding the product. At the same time, assembly structure description is independent of the representation of parts, and part models are managed independently from the assembly model. This is necessary to apply independent instances of a part model in different assembly models or several times in the same assembly model. 

Therefore, a new class se has been developed, which completely replaces the build-in scalar type double of C-I-+. An instance of se references not any more a number itself but instead all information to optimize operations formulated with sc s. All standard operators have been overloaded, so there is almost no difference between programming with doubles and programming with se s. One advantage of using overloaded operators is that there is no need to write a scanner and parser as in a symbolic language, since the scanner and parts of the parser from C-f—h itself is used [8]. The basic class structure is taken from a simplified model of a macro-assembler or compiler [8], see Fig. 3. 

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