fn-wrapper: initial version of macro magic

1 files changed, 19 insertions, 0 deletions

diff --git a/content/2024-04-24-fn-wrapper-macro-magic/wrap-v1.cc b/content/2024-04-24-fn-wrapper-macro-magic/wrap-v1.cc
new file mode 100644
index 0000000..d3f3ddf
--- /dev/null
+++ b/content/2024-04-24-fn-wrapper-macro-magic/wrap-v1.cc
@@ -0,0 +1,19 @@
+// Mock the common wrapper functionality. For the purpose of this discussion,
+// this is just a sink accepting any function argument.
+#define MOCK_WRAPPER_IMPL(ret, fn) \
+  /* do common work */             \
+  static ret wrap_##fn(...);
+
+// Utility to generate wrapper boilerplate.
+#define WRAP(ret, fn, ...)   \
+  MOCK_WRAPPER_IMPL(ret, fn) \
+                             \
+  extern "C" ret fn(__VA_ARGS__)
+
+WRAP(int, foo, const char* name) {
+  return wrap_foo(name);
+}
+
+WRAP(int, bar, const char* name, const char* value) {
+  return wrap_bar(name, value);
+}