need 'this' to access data member

[Mike Parker]

clayasaurus wrote:

>>
> 
> That would be nicer, but it is not my call. The SDL_RWops structure is 
> from the SDL library (www.libsdl.org) and the goal is to stay as close 
> to the original structure as possible.
> 
> 

In C, named inner structs and unions are treated as fields.

This...

##############
typedef struct
{
    struct foo
    {
       int x;
    }
} MyStruct;

MyStruct ms;
ms.foo.x = 0;
##############

...is identical to this...

##############
typedef struct
{
    int x;
} Foo;

typedef struct
{
    Foo foo;
} MyStruct;

MyStruct ms;
ms.foo.x = 0;
##############

Assuming a 32 bit C compiler, both sizeof(MyStruct) in both examples 
above should output '4'.

In D, inner structs and unions are treated as type declarations but not 
members. Here is the same example in D:

##############
struct MyStruct
{
    struct foo
    {
       int x;
    }
}
MyStruct ms;
ms.foo.x = 0; // Error
#############

MyStruct.sizeof will output 1 in this example. Not only is foo not 
accessible as a member field, MyStruct is incompatible with the C side 
of the house. The following version fixes both issues:

##############
struct MyStruct
{
    struct Foo
    {
       int x;
    }
    Foo foo;
}
MyStruct ms;
ms.foo.x = 0;
##############

Now the output of MyStruct.sizeof should be the same as the C version.

DerelictSDL was a tedious port, so I'm surprised more silliness like 
this hasn't turned up yet. I'm glad you caught it.