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Example C++23 and C++20 syntax and tests of compilers and CMake

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# C++23 and C++20 Examples

[![ci](https://github.com/scivision/Cpp23-examples/actions/workflows/cmake.yml/badge.svg)](https://github.com/scivision/Cpp23-examples/actions/workflows/cmake.yml)

Examples of using CMake with
[C++26](https://en.cppreference.com/w/cpp/26),
C++23, and C++20 standard syntax.
This is useful for testing of compilers and build systems--already several bugs have been so detected.

We typically use
[feature testing macros](https://en.cppreference.com/w/cpp/feature_test)
to detect a feature, but some features require a small compile and link test.

[C++ execution policy benchmark](./execution_policy/Readme.md)

## Troubleshooting

If the cstdlib check fails on macOS, this can be a symptom of
[Xcode being incompatible](https://www.scivision.dev/cmake-macos-environment-xcode/)
with the compiler.
Try setting environment variable `SDKROOT` to the previous Xcode SDK path that worked previous to the Xcode upgrade that broke.

## Related projects

* [C23 examples](https://github.com/scivision/C23-examples)
* [C++17 filesystem application](https://github.com/scivision/fortran-filesystem)
* [C++ modules](https://github.com/scivision/CppModules)

## References

* [Each new C++20 feature with example in one page](https://oleksandrkvl.github.io/2021/04/02/cpp-20-overview.html)

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