EzExpr is a easy to use and flexible expression parser / evaluator in a one file header only style for cpp11 at least
ez::Expr ev;
auto result0 = ev.parse("x + 2.5 * d").set("x", 0.5).set("d", 1.5).eval().getResult();
auto result1 = ev.set("x", 10.5).eval().getResult();
auto result2 = ev.set("d", 2.5).eval().getResult();ez::Expr ev;
ev.addFunction("fma", [](double a, double b, double c) { return a*b+c; }); // ternary function
auto result0 = ev.parse("floor(fma(x,y,k))").set("x", 0.5).set("y", 1.5).set("k", 3.2).eval().getResult();- Modern use
- One header file only
- Parsing and evaluation on separated calls
- User can easily add their custom Unary/Binary/Ternary Function
- Cpp11 compatible at least
- Can identify and return to user the variables
- Many exceptions are emited for many not conformant issue during parsing and during evaluation
- Use their own String class for faster response
- all numbers and computation are in double precision
+ - * / ^ %
! (factorielle : N!)- pi
- e
- abs, floor, ceil, round, fract, sign
- sin, cos, tan
- asin, acos, atan
- sinh, cosh, tanh
- asinh, acosh, atanh
- ln, log, log1p, logb, log2, log10
- exp
- sqrt
- mod, atan2, min, max, step, hypot, smoothabs
- clamp, mis, smoothstep (glsl functions)
- saturate, lerp (hlsl functions)