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How do you calculate log base 2 in Java for integers?
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If you are thinking about using floating-point to help with integer arithmetics, you have to be careful.
I usually try to avoid FP calculations whenever possible.
Floating-point operations are not exact. You can never know for sure what will (in...
Aborting a stash pop in Git
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Ok, I think I have worked out "git stash unapply". It's more complex than git apply --reverse because you need reverse merging action in case there was any merging done by the git stash apply.
The reverse merge requires that all current changes be p...
How can I break an outer loop with PHP?
I am looking to break an outer for/foreach loop in PHP.
6 Answers
6
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Is it better to use std::memcpy() or std::copy() in terms to performance?
...g to see what I could do to make std::copy faster again. The answer turned out to be simple: turn on link time optimization. These are my results with LTO turned on (option -flto in gcc):
Time (in seconds) to complete run of MD5 tests with -flto
std::copy memcpy % difference
5.54 5.5...
Is quitting an application frowned upon?
...ment closes up the application as needed. Those users simply don't think about "terminating" the Android app, any more than they think about "terminating" a Web page or "terminating" a thermostat.
iPhone users are much the same way, in that pressing the iPhone button does not necessarily "feel" like...
What is the performance cost of having a virtual method in a C++ class?
...n a direct (non-virtual) function call.
So, not really worth worrying about the cost unless the function is something like a trivial Get()/Set() accessor, in which anything other than inline is kind of wasteful. A 7ns overhead on a function that inlines to 0.5ns is severe; a 7ns overhead on a fun...
What are the differences between a multidimensional array and an array of arrays in C#?
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A multidimensional array creates a nice linear memory layout while a jagged array implies several extra levels of indirection.
Looking up the value jagged[3][6] in a jagged array var jagged = new int[10][5] works like this: Look up the element at index 3 (which is an array) and loo...
Nullable Foreign Key bad practice?
... a foreign key to a Customer Id. Now, suppose you want to add an Order without a Customer Id, (whether that should be possible is another question) you would have to make the foreign key NULL... Is that bad practice or would you rather work with a link table between Orders and Customers? Although th...
How to return only the Date from a SQL Server DateTime datatype
...os:
No varchar<->datetime conversions required
No need to think about locale
As suggested by Michael
Use this variant: SELECT DATEADD(dd, DATEDIFF(dd, 0, getdate()), 0)
select getdate()
SELECT DATEADD(hh, DATEDIFF(hh, 0, getdate()), 0)
SELECT DATEADD(hh, 0, DATEDIFF(hh, 0, getdate())...
How does free know how much to free?
...).
When you call free(), it simply looks at the extra information to find out how big the block is.
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