debug: add some constexpr/consteval asserts

debug/assert.hpp

@@ -46,6 +46,15 @@
 #endif
 
 
+constexpr void constexpr_assert (auto const &expr)
+{
+    if (std::is_constant_evaluated ())
+        static_cast<bool> (expr) ? void (0) : [] () { throw nullptr; } ();
+    else
+        assert (expr);
+}
+
+
 ///////////////////////////////////////////////////////////////////////////////
 #define SCOPED_SANITY(A) \
 ::cruft::debug::scoped_sanity PASTE(__scoped_sanity_checker,__LINE__) ((A)); \

debug/panic.hpp

@@ -58,6 +58,15 @@ panic [[noreturn]] (const std::string &msg)
 }
 
 
+template <typename TagT = void>
+constexpr void consteval_panic (void) noexcept {
+    if constexpr (std::is_same_v<TagT, void>) {
+        throw nullptr;
+    }
+}
+
+
+
 ///////////////////////////////////////////////////////////////////////////////
 // not_implemented/unreachable/panic must be callable from constexpr contexts.
 // but they rely on functions that aren't constexpr to perform the controlled