Added a C++ example

.gitignore

@@ -319,3 +319,4 @@ api/api.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
 *.xcscheme
 gravity.xcodeproj/xcuserdata/marco.xcuserdatad/xcschemes/xcschememanagement.plist
 *.xcscheme
+examples/GravityCpp/GravityCpp.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

examples/GravityCpp/GravityCpp.xcodeproj/project.pbxproj

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+}

examples/GravityCpp/GravityCpp/main.cpp

@@ -0,0 +1,188 @@
+//
+//  main.cpp
+//  GravityCpp
+//
+//  Created by Marco Bambini on 26/12/2018.
+//  Copyright © 2018 Creolabs. All rights reserved.
+//
+
+#include "gravity_compiler.h"
+#include "gravity_core.h"
+#include "gravity_vm.h"
+#include "gravity_macros.h"
+#include "gravity_vmmacros.h"
+#include "gravity_opcodes.h"
+#include <iostream>
+using namespace std;
+
+// MARK: - C++ code -
+
+class Rectangle {
+public:
+    double length;
+    double height;
+    
+    // Constructor
+    Rectangle(double l = 2.0, double h = 2.0) {
+        cout << "Rectangle constructor called." << endl;
+        length = l;
+        height = h;
+    }
+    
+    virtual ~Rectangle() {
+        cout << "Rectangle destructor called." << endl;
+    }
+    
+    // Methods
+    double Area() {
+        return length * height;
+    }
+    
+    void Test(double p1, int32_t p2, string p3) {
+        cout << "Rectangle test: " << p1 << p2 << p3 << endl;
+    }
+};
+
+// MARK: - Gravity Bridge -
+
+static bool rect_create (gravity_vm *vm, gravity_value_t *args, uint16_t nargs, uint32_t rindex) {
+    // check for optional parameters here (if you need to process a more complex constructor)
+    
+    // self parameter is the rect_class create in register_cpp_classes
+    gravity_class_t *c = (gravity_class_t *)GET_VALUE(0).p;
+    
+    // create Gravity instance and set its class to c
+    gravity_instance_t *instance = gravity_instance_new(vm, c);
+    
+    // allocate a cpp instance of the Rectangle class on the heap
+    Rectangle *r = new Rectangle();
+    
+    // set cpp instance and xdata of the gravity instance (for later used in the rect_area and rect_test functions)
+    gravity_instance_setxdata(instance, r);
+    
+    // return instance
+    RETURN_VALUE(VALUE_FROM_OBJECT(instance), rindex);
+}
+
+static bool rect_area (gravity_vm *vm, gravity_value_t *args, uint16_t nargs, uint32_t rindex) {
+    // get self object which is the instance created in rect_create function
+    gravity_instance_t *instance = (gravity_instance_t *)GET_VALUE(0).p;
+    
+    // get xdata (which is a cpp Rectangle instance)
+    Rectangle *r = (Rectangle *)instance->xdata;
+    
+    // invoke the Area method
+    double d = r->Area();
+    
+    RETURN_VALUE(VALUE_FROM_FLOAT(d), rindex);
+}
+
+static bool rect_test (gravity_vm *vm, gravity_value_t *args, uint16_t nargs, uint32_t rindex) {
+    // get self object which is the instance created in rect_create function
+    gravity_instance_t *instance = (gravity_instance_t *)GET_VALUE(0).p;
+    
+    // get xdata (which is a cpp Rectangle instance)
+    Rectangle *r = (Rectangle *)instance->xdata;
+    
+    // invoke the Test method with dummy parameters
+    // the right way to proceed here would be to check for nargs first
+    // and then check if each parameter is of the right type
+    // and then bind parameters to the cpp call (using the std::bind method)
+    r->Test(3.0, 89, "rect_test");
+    
+    RETURN_NOVALUE();
+}
+
+static void object_free (gravity_vm *vm, gravity_object_t *obj) {
+    gravity_instance_t *instance = (gravity_instance_t *)obj;
+    
+    // get xdata (which is a cpp Rectangle instance)
+    Rectangle *r = (Rectangle *)instance->xdata;
+    
+    // explicitly free memory
+    delete r;
+}
+
+void register_cpp_classes (gravity_vm *vm) {
+    // create Rectangle class
+    gravity_class_t *rect_class = gravity_class_new_pair(vm, "Rectangle", NULL, 0, 0);
+    gravity_class_t *rect_class_meta = gravity_class_get_meta(rect_class);
+    
+    gravity_class_bind(rect_class_meta, GRAVITY_INTERNAL_EXEC_NAME, NEW_CLOSURE_VALUE(rect_create));
+    gravity_class_bind(rect_class, "area", NEW_CLOSURE_VALUE(rect_area));
+    gravity_class_bind(rect_class, "test", NEW_CLOSURE_VALUE(rect_test));
+    
+    // register Rectangle class inside VM
+    gravity_vm_setvalue(vm, "Rectangle", VALUE_FROM_OBJECT(rect_class));
+}
+
+// MARK: - Main -
+
+void report_error (gravity_vm *vm, error_type_t error_type, const char *message, error_desc_t error_desc, void *xdata) {
+    #pragma unused(vm, xdata)
+    
+    const char *type = "N/A";
+    switch (error_type) {
+        case GRAVITY_ERROR_NONE: type = "NONE"; break;
+        case GRAVITY_ERROR_SYNTAX: type = "SYNTAX"; break;
+        case GRAVITY_ERROR_SEMANTIC: type = "SEMANTIC"; break;
+        case GRAVITY_ERROR_RUNTIME: type = "RUNTIME"; break;
+        case GRAVITY_WARNING: type = "WARNING"; break;
+        case GRAVITY_ERROR_IO: type = "I/O"; break;
+    }
+    
+    if (error_type == GRAVITY_ERROR_RUNTIME) printf("RUNTIME ERROR: ");
+    else printf("%s ERROR on %d (%d,%d): ", type, error_desc.fileid, error_desc.lineno, error_desc.colno);
+    printf("%s\n", message);
+}
+
+int main(int argc, const char * argv[]) {
+    cout << "Gravity version " << GRAVITY_VERSION << endl << endl;
+    
+    const char source_code[] =  "extern var Rectangle;"
+                                "extern var Triangle;"
+                                "func main() {"
+                                "var r = Rectangle();"
+                                "System.print(r.area());"
+                                "r.test(1.0, 32, \"Hello\");"
+                                "return 1;"
+                                "}";
+    
+    // setup delegate
+    gravity_delegate_t delegate = {
+        .error_callback = report_error,
+        .bridge_free = object_free
+    };
+    
+    // setup compiler
+    gravity_compiler_t *compiler = gravity_compiler_create(&delegate);
+    
+    // compile source code
+    gravity_closure_t *closure = gravity_compiler_run(compiler, source_code, strlen(source_code), 0, true, true);
+    if (!closure) return -1; // syntax/semantic error
+    
+    // setup Gravity VM
+    gravity_vm *vm = gravity_vm_new(&delegate);
+    
+    // transfer memory from compiler to VM
+    gravity_compiler_transfer(compiler, vm);
+    
+    // cleanup compiler
+    gravity_compiler_free(compiler);
+    
+    // register my C++ classes inside Gravity VM
+    register_cpp_classes(vm);
+    
+    // run main func
+    if (gravity_vm_runmain(vm, closure)) {
+        // print result to stdout
+        gravity_value_t result = gravity_vm_result(vm);
+        gravity_value_dump(vm, result, NULL, 0);
+    }
+    
+    // cleanup
+    gravity_vm_free(vm);
+    gravity_core_free();
+    
+    return 0;
+}