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spack.io "cpp20" keyword

mpark-variant 1.4.0
C++17 `std::variant` for C++11/14/17
2 versions - Latest release: almost 4 years ago - 1 dependent package - 699 stars on GitHub - 1 maintainer
figcone 3.0.0
figcone - is a C++17 library, providing a convenient declarative interface for configuration pars...
2 versions - Latest release: almost 2 years ago - 112 stars on GitHub
span-lite 0.11.0
A single-file header-only version of a C++20-like span for C++98, C++11 and later
10 versions - Latest release: almost 2 years ago - 504 stars on GitHub
doctest 2.4.11 💰
The fastest feature-rich C++11/14/17/20/23 single-header testing framework
1 version - Latest release: over 1 year ago - 6,449 stars on GitHub