kalcy

./kalcy-quickstart
usage: ./kalcy-quickstart [-v] "<expression>"

./kalcy-quickstart 42
42

./kalcy-quickstart -v "1 + 2 * 3 ^ 2"
19
expression      : 1 + 2 * 3 ^ 2
AST             : (1 + (2 * (3 ^ 2)))

./kalcy-quickstart -v "-2.5 * sqrt(pi)"
-4.43113
expression      : -2.5 * sqrt(pi)
AST             : (-2.5 * sqrt(pi))

Source

https://github.com/cpp-gamedev/kalcy

Features

• Static library.
• Recursive descent parsing.
• Closed-set polymorphism of expression types (using std::variant).
• Support for a “read-only” execution environment (constants and pure functions).