Use __cpp_concepts feature test macro #242
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to decide on concepts syntax. With gcc 10.2 -std=c++20, which uses the C++20 Standard concepts syntax, __cplusplus = 201709L whereas __cpp_concepts = 201907L (the C++20 value). after 5d63e61
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to decide on concepts syntax.
With gcc 10.2 -std=c++20, which uses the C++20 Standard concepts syntax, __cplusplus = 201709L whereas __cpp_concepts = 201907L (the C++20 value).
after 5d63e61