Question 1

How to add a custom function in TinyExpr?

Accepted Answer

Define a C function with double return type and parameters, then register it using the te_variable struct with flags like TE_FUNCTION2 for two arguments. For example, to add 'my_sum', set it up in the variables array before compilation.

Question 2

Is TinyExpr thread-safe with all malloc implementations?

Accepted Answer

Only if your malloc is thread-safe; otherwise, you need to ensure synchronization. The library itself doesn't handle thread safety beyond assuming safe malloc.

Question 3

TinyExpr vs muparser: which should I use?

Accepted Answer

TinyExpr is better for minimal, dependency-free projects where size matters. Muparser offers more features and potentially better performance, but adds dependencies and complexity.

Question 4

How to bind variables that change during runtime?

Accepted Answer

Use te_compile with a te_variable array pointing to your data, then update those pointers before calling te_eval. This avoids recompilation and allows dynamic values.

Question 5

Can TinyExpr handle expressions with hexadecimal numbers?

Accepted Answer

Yes, it supports hexadecimal constants (e.g., 0x57CEF7) as part of its grammar, along with decimals and scientific notation, making it versatile for numerical inputs.

Question 6

What's the memory usage of TinyExpr for embedded systems?

Accepted Answer

Very low—the entire library is in two small C files with no dependencies, ideal for resource-constrained environments like microcontrollers or lightweight applications.

Tinyexpr

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