testing inheritance

README.md

@@ -2,10 +2,12 @@ inspeired by this [article](https://floooh.github.io/2020/08/23/sokol-bindgen.ht
 
 `zig cc -x c++ -std=c++11 -Xclang -ast-dump=json {input_file}`
 
+- ctors and dtors
 - parse fn ptr function pointers should be decorated with `callconv(.C)`
 - write opaques if they didn't get defined at the end of the file
 - use `@compileError` for objects that couldn't be transpiled
-- virtual functions and vtable
+- auto add `vtable: *const anyopaque,` in needed types
+- static methods inside classes
 - peform layout validation
 
 test with: other libraries from: https://github.com/godotengine/godot/tree/master/modules

build.zig

@@ -37,7 +37,7 @@ pub fn build(b: *std.Build) void {
     // smol_lib.addIncludePath("./use_cases/common_cases/include");
     // //smol_lib.linkLibC();
     // smol_lib.linkLibCpp();
-    // smol_lib.addCSourceFile("./use_cases/common_cases/include/c002_cpp_structs.cpp", cflags);
+    // smol_lib.addCSourceFile("./use_cases/common_cases/include/c005_inheritance.cpp", cflags);
     // exe.linkLibrary(smol_lib);
 
     // This declares intent for the executable to be installed into the

use_cases/common_cases/c005_inheritance.zig

@@ -20,3 +20,9 @@ pub const circle_t = extern struct {
     extern fn _ZNK8circle_t4areaEv(self: *const circle_t) f32;
     pub const area = _ZNK8circle_t4areaEv;
 };
+
+extern fn _Z6circlef(radius: f32) circle_t;
+pub const circle = _Z6circlef;
+
+extern fn _Z4areaRK7shape_t(shape: [*c]const shape_t) f32;
+pub const area = _Z4areaRK7shape_t;

use_cases/common_cases/include/c005_inheritance.cpp

@@ -0,0 +1,17 @@
+#include "c005_inheritance.h"
+
+circle_t::circle_t(float radius) {
+    this->radius = radius;
+}
+
+float circle_t::area() const {
+    return 3.14 * radius * radius;
+}
+
+circle_t circle(float radius) {
+    return circle_t(radius);
+}
+
+float area(const shape_t &shape) {
+    return shape.area();
+}

use_cases/common_cases/include/c005_inheritance.h

@@ -3,16 +3,20 @@ struct vec2_t {
     float y;
 };
 
-class shape_t {
+struct shape_t {
 public:
     vec2_t aabb;
     virtual float area() const = 0;
 };
 
-class circle_t: public shape_t {
+struct circle_t: public shape_t {
 public:
-    virtual float area() const = 0;
+    circle_t(float radius);
+    virtual float area() const;
 
 private:
     float radius;
-};
+};
+
+circle_t circle(float radius);
+float area(const shape_t &shape);