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#include <iostream> #include <type_traits> #include <random> #include "func.h" void NoRefFoo(Counter x) { std::cout << "No ref func: " << x << '\n'; } void RefFoo(const Counter& x) { std::cout << "Ref func: " << x << '\n'; } int main() { static_assert(sizeof(Counter) <= 8); int x = 0; Counter w(x); int n; std::cin >> n; srand(n); static_assert(!std::is_invocable_v<decltype(NoRefFoo), Counter>); static_assert(std::is_invocable_v<decltype(RefFoo), Counter>); static_assert(std::is_invocable_v<decltype(RefFoo), const Counter&>); std::cout << "All static assertions passed!\n"; RefFoo(w); x = 19; int cnt; do { cnt = abs(rand()) % 20; } while(cnt == 0); for (size_t i = 0; i < cnt; ++i) { std::cout << w << '\n'; } std::cout << w << '\n'; x = 38; std::cout << w << '\n'; return 0; }
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