ultimateprogramer · October 27, 2022 10:23 · Oct 27, 2022 · Jul 17, 2011
diff --git a/gistfile1.c++ b/gistfile1.c++
@@ -1,38 +0,0 @@
-// g++ simple.cpp -shared -o libsimple.dylib
-#include <stdio.h>
-
-class Simple {
-  int id_;
-public:
-  Simple(int id);
-
-  ~Simple();
-
-  int id();
-};
-
-Simple::Simple(int id) : id_(id) {
-  printf("[%p:%i] Simple()\n", this, id_);
-}
-
-Simple::~Simple() {
-  printf("[%p:%i] ~Simple()\n", this, id_);
-}
-
-int Simple::id() {
-  return id_;
-}
-
-extern "C" {
-  Simple *Simple_Simple(int id) {
-    return new Simple(id);
-  }
-
-  void Simple__gc(Simple *this_) {
-    delete this_;
-  }
-
-  int Simple_id(Simple *this_) {
-    return this_->id();
-  }
-}

diff --git a/gistfile1.cpp b/gistfile1.cpp
@@ -0,0 +1,36 @@
+// g++ simple.cpp -shared -o libsimple.dylib
+#include <stdio.h>
+
+class Simple {
+    int id_;
+public:
+    Simple(int id);
+    ~Simple();
+    int id();
+};
+
+Simple::Simple(int id) : id_(id) {
+    printf("[%p:%i] Simple()\n", this, id_);
+}
+
+Simple::~Simple() {
+    printf("[%p:%i] ~Simple()\n", this, id_);
+}
+
+int Simple::id() {
+    return id_;
+}
+
+extern "C" {
+    Simple *Simple_Simple(int id) {
+        return new Simple(id);
+    }
+
+    void Simple__gc(Simple *this_) {
+        delete this_;
+    }
+
+    int Simple_id(Simple *this_) {
+        return this_->id();
+    }
+}
diff --git a/gistfile2.c b/gistfile2.c
@@ -0,0 +1,7 @@
+/* This is C code */
+#include "Fred.h"
+
+void c_function(Fred* fred)
+{
+    cplusplus_callback_function(fred);
+}
diff --git a/gistfile2.cpp b/gistfile2.cpp
@@ -0,0 +1,11 @@
+// This is C++ code
+#include "Fred.h"
+
+Fred::Fred() : a_(0) {}
+void Fred::wilma(int a) {}
+
+Fred* cplusplus_callback_function(Fred* fred)
+{
+    fred->wilma(123);
+    return fred;
+}
diff --git a/gistfile2.h b/gistfile2.h
@@ -0,0 +1,28 @@
+/* This header can be read by both C and C++ compilers */
+#ifndef FRED_H
+#define FRED_H
+#ifdef __cplusplus
+    class Fred {
+        public:
+            Fred();
+            void wilma(int);
+        private:
+            int a_;
+    };
+#else
+    typedef struct Fred Fred;
+#endif
+#ifdef __cplusplus
+extern "C" {
+#endif
+#if defined(__STDC__) || defined(__cplusplus)
+    extern void c_function(Fred*);   /* ANSI C prototypes */
+    extern Fred* cplusplus_callback_function(Fred*);
+#else
+    extern void c_function();        /* K&R style */
+    extern Fred* cplusplus_callback_function();
+#endif
+#ifdef __cplusplus
+}
+#endif
+#endif /*FRED_H*/
diff --git a/gistfile2b.cpp b/gistfile2b.cpp
@@ -0,0 +1,9 @@
+// This is C++ code
+#include "Fred.h"
+
+int main()
+{
+    Fred fred;
+    c_function(&fred);
+    // ...
+}
diff --git a/gistfile1.c++ b/gistfile1.c++
@@ -0,0 +1,38 @@
+// g++ simple.cpp -shared -o libsimple.dylib
+#include <stdio.h>
+
+class Simple {
+  int id_;
+public:
+  Simple(int id);
+
+  ~Simple();
+
+  int id();
+};
+
+Simple::Simple(int id) : id_(id) {
+  printf("[%p:%i] Simple()\n", this, id_);
+}
+
+Simple::~Simple() {
+  printf("[%p:%i] ~Simple()\n", this, id_);
+}
+
+int Simple::id() {
+  return id_;
+}
+
+extern "C" {
+  Simple *Simple_Simple(int id) {
+    return new Simple(id);
+  }
+
+  void Simple__gc(Simple *this_) {
+    delete this_;
+  }
+
+  int Simple_id(Simple *this_) {
+    return this_->id();
+  }
+}
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