Struct FieldInfo

Example

size & layout checks for C++ structs / objects

foreach (Type; TypesWithLayout)
{
    foreach (idx, field; Type.init.tupleof)
    {
        auto object = Type.init;
        auto field_info = cppFieldInfo(object,
            Type.tupleof[idx].stringof.toStringz);

        assert(typeof(field).sizeof == field_info.size,
            format("Field '%s' of '%s' size mismatch: %s (D) != %s (C++)",
                Type.tupleof[idx].stringof, Type.stringof,
                typeof(field).sizeof, field_info.size));

        assert(Type.tupleof[idx].offsetof == field_info.offset,
            format("Field '%s' of '%s' offset mismatch: %s (D) != %s (C++)",
                Type.tupleof[idx].stringof, Type.stringof,
                Type.tupleof[idx].offsetof, field_info.offset));
    }
}