Add project files.

source/examples/HotReloadDemo/Shared/PluginApi.h

@@ -0,0 +1,55 @@
+/* PluginApi.h -- the contract PluginV1 and PluginV2 both implement,
+ * and the Host loads by name. Every function here follows
+ * cpp-style-guide.md section 11's rule for anything loaded at runtime:
+ * plain C linkage, no classes or exceptions crossing the boundary.
+ *
+ * This header is deliberately identical for both plugin versions --
+ * in a real project this is the file that stays stable while
+ * PluginV1/src/Plugin.cpp and PluginV2/src/Plugin.cpp (standing in for
+ * "the same file, before and after your edit") diverge.
+ */
+#pragma once
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+	/* Changes behavior between V1 and V2 -- watch this one get
+	 * HOT_RELOAD_SYMBOL_PATCHED. */
+	int plugin_tick(int input);
+
+	/* Only in V1, gone in V2 -- watch this one get
+	 * HOT_RELOAD_SYMBOL_REMOVED, and the Host's stub take over for any
+	 * call still aimed at it afterwards. */
+	int plugin_legacy_feature(int input);
+
+	/* Only in V2 -- watch this one get HOT_RELOAD_SYMBOL_ADDED, then
+	 * get called for the first time right after. */
+	int plugin_new_feature(int input);
+
+#if defined(__GNUC__) || defined(__clang__)
+	/* Deliberately too small to safely hold a jump on any of this
+	 * library's backends (its patchable-function-entry padding is
+	 * overridden down to zero) -- watch this one get
+	 * HOT_RELOAD_SYMBOL_SKIPPED_TOO_SMALL rather than corrupt whatever
+	 * comes after it. MSVC has no equivalent per-function override
+	 * this demo could apply, so this one only exists on GCC/Clang.
+	 */
+	__attribute__((patchable_function_entry(0))) int plugin_tiny_function(int input);
+#endif
+
+	/* An exported VARIABLE, not a function, sitting right next to
+	 * real functions in the same library and changing value between
+	 * V1 and V2 just like plugin_tick's behavior does -- watch this
+	 * one get HOT_RELOAD_SYMBOL_SKIPPED_NOT_CODE. This is the
+	 * mechanical proof behind hot_reload.h's "only executable code
+	 * changes" guarantee: nothing here tells the library "this one is
+	 * data, don't touch it" -- it discovers that itself from the
+	 * symbol table, the same way it discovers plugin_tick is code.
+	 */
+	extern int plugin_build_marker;
+
+#ifdef __cplusplus
+}
+#endif