On Mon, 05 Jan 2026 at 18:03 +0800, Bingzhi wrote:
In GCC 15.2.0, the following code compiles: template<typename T> concept Can_sizeof = sizeof(T);I don't know which rule in the ISO C++20, but this code doesn't compile under Clang 21.1.5: error: atomic constraint must be of type 'bool' (found 'unsigned long').
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