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What is the correct way of using C++11's range-based for?
....
This is inefficient code, e.g., if these elements are instances of std::string,
heap memory allocations can be done, with expensive trips to the memory manager, etc.
This is useless if we just want to observe the elements in a container.
So, a better syntax is available: capture by const referen...
How to rethrow InnerException without losing stack trace in C#?
...lls SetObjectData
// voila, e is unmodified save for _remoteStackTraceString
}
This wastes a lot of cycles compared to calling InternalPreserveStackTrace via cached delegate, but has the advantage of relying only on public functionality. Here are a couple of common usage patterns for stack-tr...
Why is there huge performance hit in 2048x2048 versus 2047x2047 array multiplication?
...ix do not fit, then you will loose time swapping in elements from RAM. The extra 4095 elements may just be enough to prevent rows from fitting.
In your case, 2 rows for 2047 2d matrices fall within 16KB of memory (assuming 32 bit types). For example, if you have an L1 cache (closest to the cpu on t...
Faster way to develop and test print stylesheets (avoid print preview every time)?
...t the same view as provided in print preview - espacially when it comes to extra whitespace - make sure, your print preview in not different after you're done with this substep.
– jave.web
May 12 '17 at 2:14
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Get top n records for each group of grouped results
... := 0) AS vars. I get the idea is to declare empty variables, but it seems extraneous for MySql.
– Joseph Cho
Jun 6 '18 at 18:42
1
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How to use ArrayAdapter
...ut has only one TextView
// do whatever you want with your string and long
viewHolder.itemView.setText(String.format("%s %d", item.reason, item.long_val));
}
return convertView;
}
}
For those not very familiar with the Android framework, this is exp...
Exporting a function in shell
...
Functions are not exportable by nature. However you can export strings, so I have a little trick here:
func="$(typeset -f funcname)"
export func
To import the function, re-define it from the exported string:
# in subshell
eval "$func"
...
How can I remove a commit on GitHub? [duplicate]
...u need to add them to git before committing:
git add .
6 - Add whatever extra changes you need, then commit the needed files, (or use a dot '.' instead of stating each file name, to commit all files in the local repository:
git commit -m "<new_commit_message>" <file1> <file2> ....
Why shouldn't I use “Hungarian Notation”?
..., Hungarian Notation where you prefix your variable names with their type (string) (Systems Hungarian) is bad because it's useless.
Hungarian Notation as it was intended by its author where you prefix the variable name with its kind (using Joel's example: safe string or unsafe string), so called Ap...
Cross Browser Flash Detection in Javascript
... solution. It won't work if you don't include it, and it would be a lot of extra bloat/execution logic if you checked for the library every time you used it.
– Andrew Ensley
Apr 26 '15 at 18:19
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