constructor declaration

[BalaQT]

Dear experts,

Just a quick question,

1) In constructor declaration, which is better

myClass(QWidget *pParent = 0)

myClass(QWidget *pParent = 0)

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or

myClass(QWidget *pParent = NULL)

myClass(QWidget *pParent = NULL)

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2)and shall I check like the following? (comparing integer and pointer?)

if ( 0 == qApp->activeModalWidget())

if ( 0 == qApp->activeModalWidget())

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Thanks,
Bala

[Santosh Reddy]

better be consistent, use 0, both in ctor and comparison.

If need to use NULL macro due to existing code, use NULL for comparing all the objects which are based on existing code. What I mean to is be constant in using them, i.e don't mix them.

eq: if class A ctor is using 0, then compare all objects / pointers of class A with 0
if class B ctor is using NULL, then compare all objects / pointer of class B with NULL

[BalaQT]

better be consistent, use 0, both in ctor and comparison.

If need to use NULL macro due to existing code, use NULL for comparing all the objects which are based on existing code. What I mean to is be constant in using them, i.e don't mix them.

eq: if class A ctor is using 0, then compare all objects / pointers of class A with 0
if class B ctor is using NULL, then compare all objects / pointer of class B with NULL

Thanks for the reply,

So, its safe to use

if ( 0 == qApp->activeModalWidget())

if ( 0 == qApp->activeModalWidget())

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Thanks,
Bala