Low-level expression evaluations

==Overview of Low-level Expression Evaluations==

When the user inputs some data for evaluation SMath Studio stores this data within a simple array of primitives (operands, operators, brackets, functions - that's all). There is a type of data to store these primitives - '''Class Term'''. Before transferring input data to the Numeric Library (NuLib.dll) or to the Symbolic Library (SyLib.dll) SMath Studio needs to substitute all available variables (commonly - operands) and functions (all the built-in, user-defined or defined in plugins). __This is the place for the low-level expression evaluation__. Plugins of this level can extend it in the most non-abstracted way. The array of '''Term''' elements must be represented in [http://en.wikipedia.org/wiki/Reverse_polish_notation|Reverse Polish Notation] (RPN) (please be sure, that you understand how it works before creating this kind of plugin). Note, that here you can create the most powerful functions with the smallest CPU & RAM usage, but it is rather hard.

Note, that all the functions that are placed inside plugins delivered in standard Setup (that is, plugins\SpecialFunctions.dll) were created using low-level expression evaluation. Even := operator is also part of this level (but it is built-in to the canvas.dll - not a plugin).

==Interface to be implemented==

'''IPluginLowLevelEvaluation '''interface