What is fpcpp?

fpcpp is a lightweight C++ library that brings functional programming techniques into C++11. For developers who appreciate the clean, expressive style of languages like Haskell but need to work in C++, it provides familiar tools like map, filter, curry, and function composition without requiring a heavy setup or complex dependencies. At a practical level, the library lets you write code in a more declarative way. Instead of writing loops to process lists of data, you can chain operations together, for instance, filtering a list, mapping a function over the results, and folding everything into a single value. The README shows examples like estimating pi through random sampling and composing mathematical functions to calculate vector norms. It achieves this using a header-based design, meaning you essentially just include the library's files in your project rather than dealing with a separate compilation step. The primary audience is C++ developers who want to experiment with or apply functional programming patterns in their codebase. Someone might use this to write more concise data processing logic or to create reusable, composable building blocks for mathematical operations. The inclusion of features like currying (fixing certain arguments of a function to create a new, simpler function) suggests it appeals to those who enjoy exploring different programming paradigms within a single language. The project is notably inspired by Haskell, a purely functional programming language, and serves as a bridge between that world and C++. It is built for C++11 and uses the CMake build system for its included tests. Beyond the examples provided, the README directs readers to an INSTALL file for usage details and does not go into further depth on additional features or long-term maintenance plans.