use callbacks for applying accel

1 files changed, 43 insertions, 0 deletions

diff --git a/common/accel-invoke.hpp b/common/accel-invoke.hpp
new file mode 100644
index 0000000..0e264c1
--- /dev/null
+++ b/common/accel-invoke.hpp
@@ -0,0 +1,43 @@
+#pragma once
+
+#include "accel-union.hpp"
+
+namespace rawaccel {
+
+    class accel_invoker {
+        using callback_t = double (*)(const accel_union&, double, double);
+
+        callback_t cb = &invoke_impl<accel_noaccel>;
+
+        template <typename T>
+        static double invoke_impl(const accel_union& u, double x, double w)
+        {
+            return apply_weighted(reinterpret_cast<const T&>(u), x, w);
+        }
+
+    public:
+
+        accel_invoker(const accel_args& args)
+        {
+            cb = visit_accel([](auto&& arg) { 
+                return &invoke_impl<remove_ref_t<decltype(arg)>>; 
+            }, make_mode(args), accel_union{});
+        }
+
+        accel_invoker() = default;
+
+        double invoke(const accel_union& u, double x, double weight = 1) const
+        {
+            return (*cb)(u, x, weight);
+        }
+    };
+
+    inline vec2<accel_invoker> invokers(const settings& args)
+    {
+        return {
+            accel_invoker(args.argsv.x),
+            accel_invoker(args.argsv.y)
+        };
+    }
+
+}