A library which allows the computation of expressions in string format.
- At the moment it supports the following operators:
&&,||,!,==,>=,<= - All values are converted to
double - Calculation is performed starting from the root node when more than one node is infected (has a changed value)
- Calculation follows the less deep branch in order to optimize cases like
AND false,OR true - Whe only one leaf node is infected, calculation is performed from bottom to top and stops if it finds a node which doesn't change its value, otherwise it continues until the root node.
std::string expr = "(v0 == 2 || (v1 > 10 && v2 > -23)) && v3 == -15.000000001 && v4";
Evaluator eval{};
eval.compile(expr);
std::unordered_map<string, double> values;
values["v0"] = 1.0;
values["v1"] = 15.5;
values["v2"] = -10.0;
values["v3"] = -15.000000001;
eval.setValues(values);
eval.setValue("v4", true);
bool res = eval();
DEBUG("Res: " << res);
The calculation exits immediately because of AND false
The calculation starts from the infected node and only performs its parent update, because the result does not change
