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Hello,
i am doing my undergraduation....one of my friends said pre increment/decrement is more efficient in implementaion than post increment/decrement...but when i asked him the explanation he said he just heard it(??????!!!!!!!!)...but i dont think efficiency is related to the order of execution if its just a single line like:
++x;
(or)
x++;
could any one pls say whether it is a valid argument or its just a gag...sorry if its too elementary....
thank you
For basic types, there's no difference between these two statements.Quote:
Originally Posted by aad1986
For compound iterators of complex objects such as std::deque, pre-increment might sometimes be slightly faster than post-increment due to the fact that it saves a temporary that the compiler doesn't optimize out.
For a very good compiler, there should be no difference.
Anyway, for basic types, even with a BAD compiler, there's no speed difference.
It's wiser to think that it's a gag. Making difference between those two constructs is a path to inefficient coding: When a programmer is concerned with pseudo-micro-optimizations, 50% of the time he decreases performances, and in every case, he never gives any big performance boost to his programs.Quote:
could any one pls say whether it is a valid argument or its just a gag...sorry if its too elementary....
In the same set of gags, there are recurring questions about what iteration statement (while, for and do-while) has the best performance. All of them perform identically at negligible random differences.