Arithmetic expression evaluator

kalcy is a simple expression parsing library built using C++20. In addition to numeric literals and operators, it supports an environment with customizable functions and constants.

Sample output

./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))

Requirements

• CMake 3.24+
• C++20 compiler and standard library (+ runtime).

CMake

Acquire the source and add it to your project's build tree via CMake FetchContent or git clone / git submodules + add_subdirectory.

Then link to kalcy:

target_link_libraries(your-target PRIVATE kalcy::kalcy)

All required headers are included in:

#include <kalcy/kalcy.hpp>

Quickstart

Check out examples/quickstart.