• imr1984 <imr1984_member pathlink.com> Apr 08 2005
• Thomas Kuehne <thomas-dloop kuehne.thisisspam.cn> Apr 08 2005
• "Walter" <newshound digitalmars.com> Apr 08 2005

imr1984 <imr1984_member pathlink.com> writes:

can we have a command line option to turn the code that creates the defautl
initializing of variables OFF? I personally never rely on it - I always
initialize my variables explicitly if I know that they are going to be read from
right away; and I worry that this implicit initialization would be inneficient

Thomas Kuehne <thomas-dloop kuehne.thisisspam.cn> writes:

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imr1984 schrieb am Fri, 8 Apr 2005 08:45:21 +0000 (UTC):
 can we have a command line option to turn the code that creates the defautl
 initializing of variables OFF? I personally never rely on it - I always
 initialize my variables explicitly if I know that they are going to be read
from
 right away; and I worry that this implicit initialization would be inneficient


Maybe support for "-Wuninitialized" and correct dataflow analysis in the
compiler to remove unrequired initialization is better. 

(1) from:
# int i;
# i = 2;

(1) to:
# int i = 2;

(2) from:
# char[2] arr;
# char[0]='a';
# char[1]='b';

(2) to:
# int[2] arr = ['a', 'b'];

TODO:
* can turn out quite compilcated for some flowcharts - e.g. Object
initializers
* requires additon of _d_new... without the use of memset to the GC

Thomas


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"Walter" <newshound digitalmars.com> writes:

"imr1984" <imr1984_member pathlink.com> wrote in message
news:d35gb1$1uhf$1 digitaldaemon.com...
 can we have a command line option to turn the code that creates the


 initializing of variables OFF? I personally never rely on it - I always
 initialize my variables explicitly if I know that they are going to be


 right away; and I worry that this implicit initialization would be



The optimizer will eliminate most redundant initializations, so there
shouldn't be much of any efficiency problem.