newlawrence / Calculate

Header-only library written in modern C++ aiming for flexibility and ease of use. Calculate is not only a mathematical expressions parser but an engine built on top of the Shunting Yard algorithm.

The main objective of the library is to offer a clean and intuitive interface, where the expressions act and feel like regular functions. Another objective is to be completely configurable; from the underlying data type to the tokenizing logic, the library is in fact a custom parser factory.

auto parser = calculate::Parser{};
auto sum = parser.parse("x+y");

sum(1., 2.);  // returns 3.

Calculate is available as a conan package:

# Append calculate to Conan's repositories list
conan remote add calculate https://api.bintray.com/conan/newlawrence/calculate

Features

• Generic. double and std::complex<double> parsers included by default.
• User defined constants, functions, and prefix, suffix and binary operators.
• Infix and postfix notations supported.
• Regex-based customizable lexers.
• Header-only.

Build and test

Calculate doesn't have any third party dependencies, the library should work with any compiler fully compatible with the C++14 standard. Currently it has being tested under gcc (5.2+), clang (3.7+), msvc (19.10+) and intel (18.0+).

The examples and tests need CMake to be built. Conan can be used to handle the dependencies:

# Build the example (Boost libraries needed)
conan install example --install-folder build/example
cmake -H. -Bbuild -DCALCULATE_BUILD_EXAMPLES=ON
cmake --build build --target example

# Build and run the tests (Catch2 library needed)
conan install test --install-folder build/test
cmake -H. -Bbuild -DCALCULATE_BUILD_TESTS=ON
cmake --build build --target make_test  # build
cmake --build build --target test       # run

User guide

Want to try? Check out Calculate's wiki to get started.

License: MIT (see copying).