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From: Aggro on 7 Apr 2008 16:24
I would like to know the answer to this for both C and C++ as I use both
languages (usually in differen projects).

Assume the code
if( A && B )

Normally A is executed before B and this is how I have always believed
it is guaranteed to work. But recently I got second hand information
that the execution order is not quaranteed. E.g. B could be executed
before A by some compilers.

Different execution order could cause e.g. application to crash if we
first test is the pointer valid and then call a function for that pointer:
if( p && p->func() )


So. Is the execution order guaranteed by the standard in both C and C++
to be first A and then B or can it change e.g. because of optimization?
Should I start writing my code in this format to be safe?

if( p )
if( p->func() )
...
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