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Struct initialisation

I have made a struct which has several fields and I initialise like this:

MyStruct foo = {a, b, c, d, e};

I just added another field to the struct at the end, and I thought I would
have to add this new field to all of the initialisers but I dont, is this
defined behaviour?
Thanks
Allan

Here is my code:
/* define struct */
typedef struct
{
HWND xiParentWnd;
const char *xiCaption;
const char *xiTitle;
DWORD xiFlags;
DWORD xiNotifyMsg;
bool AutoDelete;
} AsyncMessageBoxInfo;
/* an example initialising the strcut */
AsyncMessageBoxInfo lAMBI = {NULL, "User is no longer logged in",
mRemoteUser, MB_OK | WS_EX_TOPMOST, NULL};
Nov 14 '05 #1
2 1704

"Allan Bruce" <al*****@TAKEAWAYf2s.com> wrote in message news:c9**********@news.freedom2surf.net...
I have made a struct which has several fields and I initialise like this:

MyStruct foo = {a, b, c, d, e};

I just added another field to the struct at the end, and I thought I would
have to add this new field to all of the initialisers but I dont, is this
defined behaviour?
Thanks
Allan

Here is my code:
/* define struct */
typedef struct
{
HWND xiParentWnd;
const char *xiCaption;
const char *xiTitle;
DWORD xiFlags;
DWORD xiNotifyMsg;
bool AutoDelete;
} AsyncMessageBoxInfo;
/* an example initialising the strcut */
AsyncMessageBoxInfo lAMBI = {NULL, "User is no longer logged in",
mRemoteUser, MB_OK | WS_EX_TOPMOST, NULL};


Perfectly defined behaviour. AutoDelete would be set to zero.
I think `bool' is of an integral type.

Vijay
Nov 14 '05 #2
On Fri, 28 May 2004 12:32:36 +0100, "Allan Bruce" <al*****@TAKEAWAYf2s.com>
wrote:
I have made a struct which has several fields and I initialise like this:

MyStruct foo = {a, b, c, d, e};

I just added another field to the struct at the end, and I thought I would
have to add this new field to all of the initialisers but I dont, is this
defined behaviour?
Thanks
Allan

Yes. 6.7.8/19 of the Standard says:

"The initialization shall occur in initializer list order, each initializer
provided for a particular subobject overriding any previously listed
initializer for the same subobject; all subobjects that are not initialized
explicitly shall be initialized implicitly the same as objects that have
static storage duration."

This applies to both arrays and structs; it seems to get discussed more
often in the context of array initialization, however (in fact, I
misinterpreted it just the other day...)
-leor


Here is my code:
/* define struct */
typedef struct
{
HWND xiParentWnd;
const char *xiCaption;
const char *xiTitle;
DWORD xiFlags;
DWORD xiNotifyMsg;
bool AutoDelete;
} AsyncMessageBoxInfo;
/* an example initialising the strcut */
AsyncMessageBoxInfo lAMBI = {NULL, "User is no longer logged in",
mRemoteUser, MB_OK | WS_EX_TOPMOST, NULL};


--
Leor Zolman --- BD Software --- www.bdsoft.com
On-Site Training in C/C++, Java, Perl and Unix
C++ users: download BD Software's free STL Error Message Decryptor at:
www.bdsoft.com/tools/stlfilt.html
Nov 14 '05 #3

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