source: tests/exceptions/virtual-poly.cfa @ db1ebed

// Test virtual casts with polymorphic types.

/* IMPORTANT: The virtual system has not been finalized. However the
 * exception system does depend on the work-in-progress version currently
 * supported. That is also why the tests under the exception directory.
 */

#include <assert.h>


struct __cfatid_struct_mono_base {
    __cfavir_type_info const * parent;
};

__attribute__(( cfa_linkonce ))
struct __cfatid_struct_mono_base __cfatid_mono_base = {
    (__cfavir_type_info *)0,
};

struct mono_base_vtable {
        __cfatid_struct_mono_base const * const __cfavir_typeid;
};

struct mono_base {
        mono_base_vtable const * virtual_table;
};

forall(T)
struct __cfatid_struct_mono_child {
    __cfatid_struct_mono_base const * parent;
};

forall(T)
struct mono_child_vtable {
        __cfatid_struct_mono_child(T) const * const __cfavir_typeid;
};

forall(T)
struct mono_child {
        mono_child_vtable(T) const * virtual_table;
};

__cfatid_struct_mono_child(int) __cfatid_mono_child @= {
        &__cfatid_mono_base,
};

mono_child_vtable(int) _mono_child_vtable_instance @= {
        &__cfatid_mono_child,
};

void mono_poly_test(void) {
        mono_child(int) child = { &_mono_child_vtable_instance };
        mono_base * base = (virtual mono_base *)&child;
        assert(base);
}


forall(U)
struct __cfatid_struct_poly_base {
    __cfavir_type_info const * parent;
};

forall(U)
struct poly_base_vtable {
        __cfatid_struct_poly_base(U) const * const __cfavir_typeid;
};

forall(U)
struct poly_base {
        poly_base_vtable(U) const * virtual_table;
};

forall(V)
struct __cfatid_struct_poly_child {
    __cfatid_struct_poly_base(V) const * parent;
};

forall(V)
struct poly_child_vtable {
        __cfatid_struct_poly_child(V) const * const __cfavir_typeid;
};

forall(V)
struct poly_child {
        poly_child_vtable(V) const * virtual_table;
};

__cfatid_struct_poly_base(int) __cfatid_poly_base @= {
        (__cfavir_type_info *)0,
};
__cfatid_struct_poly_child(int) __cfatid_poly_child = {
    &__cfatid_poly_base,
};
poly_child_vtable(int) _poly_child_vtable_instance @= {
        &__cfatid_poly_child,
};

void poly_poly_test() {
        poly_child(int) child = { &_poly_child_vtable_instance };
        poly_base(int) * base = (virtual poly_base(int) *)&child;
        assert(base);
}

int main(void) {
        mono_poly_test();
        poly_poly_test();
        printf( "done\n" );
}