From 7cdad180da9dfb6378697bbaa17f86e95bc621bb Mon Sep 17 00:00:00 2001
From: Max Wash <mbswash@gmail.com>
Date: Mon, 25 May 2026 17:21:27 +0100
Subject: [PATCH] fx: add interface for performing arithmetic operations on
 values

---
 fx/include/fx/operable.h | 45 ++++++++++++++++++++++++++++++++++++++++
 fx/operable.c            | 15 ++++++++++++++
 2 files changed, 60 insertions(+)
 create mode 100644 fx/include/fx/operable.h
 create mode 100644 fx/operable.c

diff --git a/fx/include/fx/operable.h b/fx/include/fx/operable.h
new file mode 100644
index 0000000..8dbf1f9
--- /dev/null
+++ b/fx/include/fx/operable.h
@@ -0,0 +1,45 @@
+#ifndef FX_OPERABLE_H_
+#define FX_OPERABLE_H_
+
+#include <fx/int-primitives.h>
+#include <fx/macros.h>
+#include <fx/value.h>
+
+FX_DECLS_BEGIN;
+
+#define FX_TYPE_OPERABLE (fx_operable_get_type())
+
+FX_DECLARE_TYPE(fx_operable);
+
+FX_TYPE_CLASS_DECLARATION_BEGIN(fx_operable)
+	fx_status (*op_add)(
+		const fx_value *left,
+		const fx_value *right,
+		fx_value *out);
+	fx_status (*op_subtract)(
+		const fx_value *left,
+		const fx_value *right,
+		fx_value *out);
+	fx_status (*op_multiply)(
+		const fx_value *left,
+		const fx_value *right,
+		fx_value *out);
+	fx_status (*op_divide)(
+		const fx_value *left,
+		const fx_value *right,
+		fx_value *out);
+	fx_status (*op_increment)(fx_value *value);
+	fx_status (*op_decrement)(fx_value *value);
+	fx_status (*op_add_in_place)(fx_value *left, const fx_value *right);
+	fx_status (
+		*op_subtract_in_place)(fx_value *left, const fx_value *right);
+	fx_status (
+		*op_multiply_in_place)(fx_value *left, const fx_value *right);
+	fx_status (*op_divide_in_place)(fx_value *left, const fx_value *right);
+FX_TYPE_CLASS_DECLARATION_END(fx_operable)
+
+FX_API fx_type_id fx_operable_get_type(void);
+
+FX_DECLS_END;
+
+#endif
diff --git a/fx/operable.c b/fx/operable.c
new file mode 100644
index 0000000..65ac3e6
--- /dev/null
+++ b/fx/operable.c
@@ -0,0 +1,15 @@
+#include <fx/macros.h>
+#include <fx/operable.h>
+
+FX_TYPE_CLASS_BEGIN(fx_operable)
+	FX_TYPE_VTABLE_INTERFACE_BEGIN(fx_object, FX_TYPE_OBJECT)
+		FX_INTERFACE_ENTRY(to_string) = NULL;
+	FX_TYPE_VTABLE_INTERFACE_END(fx_object, FX_TYPE_OBJECT)
+FX_TYPE_CLASS_END(fx_operable)
+
+FX_TYPE_DEFINITION_BEGIN(fx_operable)
+	FX_TYPE_FLAGS(FX_TYPE_F_ABSTRACT);
+	FX_TYPE_ID(0x90a346c8, 0x0c34, 0x4189, 0xbc05, 0xf778637d8015);
+	FX_TYPE_NAME("fx.operable");
+	FX_TYPE_CLASS(fx_operable_class);
+FX_TYPE_DEFINITION_END(fx_operable)