util/TemplateString: add cast operators

src/lib/dbus/AppendIter.hxx

@@ -103,7 +103,7 @@ public:
 	template<typename T>
 	AppendMessageIter &AppendEmptyArray() {
 		return AppendMessageIter(*this, DBUS_TYPE_ARRAY,
-					 T::as_string.value)
+					 T::as_string)
 			.CloseContainer(*this);
 	}
 
@@ -120,7 +120,7 @@ public:
 	AppendMessageIter &AppendVariant(const T &value) {
 		typedef VariantTypeTraits Traits;
 		return AppendMessageIter(*this, Traits::TYPE,
-					 Traits::as_string.value)
+					 Traits::as_string)
 			.Append(value)
 			.CloseContainer(*this);
 	}
@@ -146,7 +146,7 @@ public:
 		typedef typename W::ContainedTraits ContainedTraits;
 
 		return AppendMessageIter(*this, Traits::TYPE,
-					 ContainedTraits::as_string.value)
+					 ContainedTraits::as_string)
 			.Append(value.value)
 			.CloseContainer(*this);
 	}
@@ -158,7 +158,7 @@ public:
 		typedef typename W::ContainedTraits ContainedTraits;
 
 		return AppendMessageIter(*this, Traits::TYPE,
-					 ContainedTraits::as_string.value)
+					 ContainedTraits::as_string)
 			.AppendFixedArray(value.value)
 			.CloseContainer(*this);
 	}

src/neighbor/plugins/UdisksNeighborPlugin.cxx

@@ -245,7 +245,7 @@ UdisksNeighborExplorer::HandleMessage(DBusConnection *, DBusMessage *message) no
 
 	if (dbus_message_is_signal(message, DBUS_OM_INTERFACE,
 				   "InterfacesAdded") &&
-	    dbus_message_has_signature(message, InterfacesAddedType::as_string.value)) {
+	    dbus_message_has_signature(message, InterfacesAddedType::as_string)) {
 		RecurseInterfaceDictEntry(ReadMessageIter(*message), [this](const char *path, auto &&i){
 				UDisks2::Object o(path);
 				UDisks2::ParseObject(o, std::forward<decltype(i)>(i));
@@ -256,7 +256,7 @@ UdisksNeighborExplorer::HandleMessage(DBusConnection *, DBusMessage *message) no
 		return DBUS_HANDLER_RESULT_HANDLED;
 	} else if (dbus_message_is_signal(message, DBUS_OM_INTERFACE,
 					  "InterfacesRemoved") &&
-		   dbus_message_has_signature(message, InterfacesRemovedType::as_string.value)) {
+		   dbus_message_has_signature(message, InterfacesRemovedType::as_string)) {
 		Remove(ReadMessageIter(*message).GetString());
 		return DBUS_HANDLER_RESULT_HANDLED;
 	} else

src/util/TemplateString.hxx

@@ -32,6 +32,7 @@
 
 #include <array> // for std::size()
 #include <cstddef>
+#include <string_view>
 
 namespace TemplateString {
 
@@ -39,6 +40,14 @@ template<std::size_t _size>
 struct Buffer {
 	static constexpr std::size_t size = _size;
 	char value[size + 1];
+
+	constexpr operator const char *() const noexcept {
+		return value;
+	}
+
+	constexpr operator std::string_view() const noexcept {
+		return {value, size};
+	}
 };
 
 /**