Seed Core_IO from doc snapshot

tjp/core/io/IO.h

@@ -0,0 +1,49 @@
+// License: Modified MIT (NON-AI)
+// See the LICENSE file in the root directory for license information.
+// Copyright 2025 Timothy Prepscius
+
+#pragma once
+
+#include <tjp/core/type_traits/always_false.hpp>
+
+namespace tjp::core {
+
+//namespace variant { struct Variant; }
+
+template<typename IO, typename T>
+void io_dispatch_failed(IO &io, T &t)
+{
+	static_assert(always_false<T>::value, "io_ or (io_w and io_r) must be defined for non trivial types");
+}
+
+template<typename IO, typename T>
+void io_(IO &io, T &t)
+{
+	io.on_dispatch_any(t);
+}
+
+template<typename IO, typename T>
+void io_w(IO &io, const T &t)
+{
+	io_(io, const_cast<T &>(t));
+}
+
+template<typename IO, typename T>
+void io_w_(IO &io, const T &t)
+{
+	io_w(io, t);
+}
+
+template<typename IO, typename T>
+void io_r(IO &io, T &t)
+{
+	io_(io, t);
+}
+
+template<typename IO, typename T>
+void io_r_(IO &io, T &t)
+{
+	io_r(io, t);
+}
+
+} // namespace