struct graph

examples/types/types.hpp

@@ -0,0 +1,25 @@
+#pragma once
+#include <concepts>
+#include <vector>
+namespace demo {
+template<class T> concept Addable = requires(T a) { a + a; };
+template<class T> concept Sized = requires(T a) { a.size(); };
+struct Base { int id; };
+struct Helper { int work() { return 1; } };
+template<Addable T>
+    requires std::copyable<T> && (Addable<T> || Sized<T>)
+struct Box : Base {
+    T value;
+    std::vector<T> entries;
+    Helper helper;
+    using value_type = T;
+    Box(Addable auto x) requires std::constructible_from<T, decltype(x)> : value(x) { helper.work(); }
+    template<Sized U> requires requires(U u) { u.size(); }
+    void set(const U& u) requires Addable<T> { helper.work(); }
+    void run(std::integral auto n) { helper.work(); }
+    template<class U> requires std::convertible_to<U, T>
+    void assign(U u) { value = u; }
+};
+using IntBox = Box<int>;
+enum class State { idle, ready };
+}