Applied Template Metaprogramming in SIunits
نویسنده
چکیده
While scientific programmers typically make heavy use of a programming language’s native numeric data types, such practice has been a common source of errors: it obscures the diverse intentions (e.g., distances, masses, energies, momenta, etc.) that any such purely numeric value could represent. Limitations in programming language expressiveness and compiler technology have historically made it difficult to address commensuration in a programming context. However, SIUNITS provides, in C++, a convenient means of computing with numeric values that have attached units. SIUNITS applies compile-time type checking, thus avoiding run-time overhead. Via heavy use of template metaprogramming, SIUNITS provides data types corresponding to all base and derived dimensions specified by le Système international d’Unités (SI), the recognized international standard for describing measurable quantities and their units. Thus, for example, an object resulting from the product of two LENGTH objects is automatically of type AREA. As an important additional feature, SIUNITS permits arbitrary combinations of several provided measurement views, and even allows knowledgeable users to construct their own views.
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تاریخ انتشار 2001