Move concept to separate header.

Author: heinezen

nyan/CMakeLists.txt

@@ -30,6 +30,7 @@ add_library(nyan SHARED
 	basic_type.cpp
 	c3.cpp
 	change_tracker.cpp
+	concept.cpp
 	config.cpp
 	curve.cpp
 	database.cpp

nyan/concept.cpp

@@ -0,0 +1,10 @@
+// Copyright 2025-2025 the nyan authors, LGPLv3+. See copying.md for legal info.
+
+#include "concept.h"
+
+
+namespace nyan {
+
+// this file is intentionally empty
+
+}

nyan/concept.h

@@ -0,0 +1,20 @@
+// Copyright 2025-2025 the nyan authors, LGPLv3+. See copying.md for legal info.
+
+#pragma once
+
+#include <concepts>
+
+#include "nyan/value/value.h"
+
+
+namespace nyan {
+
+/**
+ * Type that is either a nyan value or object.
+ * Object is not a value (ObjectValue is), but want to allow an
+ * overloaded conversion for direct object access.
+ */
+template <typename T>
+concept ValueLike = std::derived_from<T, Value> || std::is_same_v<T, Object>;
+
+} // namespace nyan

nyan/object.h

@@ -2,7 +2,6 @@
 #pragma once
 
 
-#include <concepts>
 #include <deque>
 #include <memory>
 #include <sstream>
@@ -11,6 +10,7 @@
 #include <vector>
 
 #include "api_error.h"
+#include "concept.h"
 #include "config.h"
 #include "object_notifier_types.h"
 #include "util.h"
@@ -31,15 +31,6 @@ class Value;
 class View;
 
 
-/**
- * Type that is either a nyan value or object.
- * Object is not a value (ObjectValue is), but want to allow an
- * overloaded conversion for direct object access.
- */
-template <typename T>
-concept ValueLike = std::derived_from<T, Value> || std::is_same_v<T, Object>;
-
-
 /**
  * Handle for accessing a nyan object independent of time.
  */