From 72603f1641bb400be6c9b0604273a4bd38932136 Mon Sep 17 00:00:00 2001
From: Clyne Sullivan <clyne@bitgloo.com>
Date: Thu, 17 Nov 2022 13:47:16 -0500
Subject: ui-coord mouse interacts with world-coord entity

---
 src/script.hpp | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

(limited to 'src/script.hpp')

diff --git a/src/script.hpp b/src/script.hpp
index 24cc142..dadddfa 100644
--- a/src/script.hpp
+++ b/src/script.hpp
@@ -21,15 +21,19 @@
 #ifndef SYSTEM_SCRIPT_HPP_
 #define SYSTEM_SCRIPT_HPP_
 
+#include "world.hpp"
+
 #include <entityx/entityx.h>
 #include <sol/sol.hpp>
 
-#include "world.hpp"
+#include <concepts>
 
 /**
  * Utility for pairing class instances to their member function calls.
  * This is useful for adding functions to the Lua game namespace.
  *
+ * TODO I am certain that this can be done better. -clyne
+ *
  * @param func The member function to call
  * @param instance The instance to bind to
  * @return A function that calls the member function using the given instance
@@ -37,7 +41,18 @@
 template<class C, typename R, typename... Args>
 auto bindInstance(R (C::* func)(Args...), C *instance)
 {
-    return [instance, func](Args... args) { (instance->*func)(args...); };
+    if constexpr (std::same_as<R, void>)
+        return [instance, func](Args... args) { (instance->*func)(args...); };
+    else
+        return [instance, func](Args... args) { return (instance->*func)(args...); };
+}
+template<class C, typename R, typename... Args>
+auto bindInstance(R (C::* func)(Args...) const, const C *instance)
+{
+    if constexpr (std::same_as<R, void>)
+        return [instance, func](Args... args) { (instance->*func)(args...); };
+    else
+        return [instance, func](Args... args) { return (instance->*func)(args...); };
 }
 
 
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