Top 8 C++ template-metaprogramming Projects

nana

5 2,016 0.0 C++

a modern C++ GUI library

Project mention: Is there any MIT/BSD licensed UI framework for C++ ? | reddit.com/r/cpp | 2022-05-21

https://github.com/cnjinhao/nana Boost Software License
UNITS

1 757 0.0 C++

a compile-time, header-only, dimensional analysis and unit conversion library built on c++14 with no dependencies.

Project mention: C++ lib for handling SI units | reddit.com/r/cpp_questions | 2021-12-08

I personally use, and recommend, the units library by Holthaus: https://github.com/nholthaus/units
Scout APM

scoutapm.com
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HFSM2

2 235 6.2 C++

High-Performance Hierarchical Finite State Machine Framework

Project mention: HFSM2 development might slow down | reddit.com/r/cpp | 2022-02-24
json_struct

4 212 7.4 C++

json_struct is a single header only C++ library for parsing JSON directly to C++ structs and vice versa

Project mention: Is there something like GSON available in C++? | reddit.com/r/cpp | 2022-05-20

I made a header only library with good performance and low memory overhead to parse JSON straight into structs, and serialize structs to JSON. How to parse into non map/object types is configurable with template functions. json_struct
array

2 151 5.1 C++

C++ multidimensional arrays in the spirit of the STL (by dsharlet)

Project mention: A basic introduction to NumPy's einsum | news.ycombinator.com | 2022-04-09

If you are looking for something like this in C++, here's my attempt at implementing it: https://github.com/dsharlet/array#einstein-reductions
It doesn't do any automatic optimization of the loops like some of the projects linked in this thread, but, it provides all the tools needed for humans to express the code in a way that a good compiler can turn it into really good code.
constexpr-sql

0 108 0.0 C++

A light weight single header alternative to DBMS
CppML

0 48 0.3 C++

A concise and readable metaprogramming language for C++
SonarQube

www.sonarqube.org
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optimizing-the-memory-layout-of-std-tuple

0 23 0.0 C++

Optimizing the memory layout of std::tuple

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020). The latest post mention was on 2022-05-21.

C++ template-metaprogramming related posts

A C++ compile-time static reflection ConfigLoader framework
3 projects | reddit.com/r/cpp | 10 Jul 2021
Constexpr SQL – C++ compile time SQL queries
1 project | news.ycombinator.com | 19 Mar 2021
C++ JSON libs Reviewed/Compared - nlohmann, rapidjson, boost.json
1 project | reddit.com/r/programming | 26 Dec 2020

Index

What are some of the best open-source template-metaprogramming projects in C++? This list will help you:

	Project	Stars
1	nana	2,016
2	UNITS	757
3	HFSM2	235
4	json_struct	212
5	array	151
6	constexpr-sql	108
7	CppML	48
8	optimizing-the-memory-layout-of-std-tuple	23

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