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Why should I use a pointer rather than the object itself?
I'm coming from a Java background and have started working with objects in C++. But one thing that occurred to me is that people often use pointers to objects rather than the objects themselves, for example this declaration:
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Get integer value of the current year in Java
...wer, Calendar would be a fine object to use. I was looking for a one-liner and I didn't think Calendar would have that for me. Proven wrong I am! Thanks!
– karlgrz
Sep 25 '08 at 22:03
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async/await - when to return a Task vs void?
... are special in another aspect: they represent top-level async operations, and have additional rules that come into play when your task returns an exception. The easiest way is to show the difference is with an example:
static async void f()
{
await h();
}
static async Task g()
{
await h()...
Split files using tar, gz, zip, or bzip2 [closed]
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You can use the split command with the -b option:
split -b 1024m file.tar.gz
It can be reassembled on a Windows machine using @Joshua's answer.
copy /b file1 + file2 + file3 + file4 filetogether
Edit: As @Charlie stated in the comment below, y...
How to execute ipdb.set_trace() at will while running pytest tests
...my_test.py --pdb --pdbcls=IPython.terminal.debugger:Pdb
From the help command:
pytest -h
--pdb start the interactive Python debugger on errors.
--pdbcls=modulename:classname
start a custom interactive Python debugger on errors.
Fo...
How does one capture a Mac's command key via JavaScript?
...is not going to be captured by browsers as such.
This is only for the command key on MacOS/keyboards.
Unlike Shift/Alt/Ctrl, the Cmd (“Apple”) key is not considered a modifier key—instead, you should listen on keydown/keyup and record when a key is pressed and then depressed based on event...
How to check whether a variable is a class or not?
...k is redundant. If it didn't there would be no way to instantiate whatever and thus you couldn't perform the check in the first place.
– a_guest
Dec 16 '16 at 12:42
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What is the proper way to re-throw an exception in C#? [duplicate]
...trace resulting from "throw ex", you'll see that it ends on that statement and not at the real source of the exception.
Basically, it should be deemed a criminal offense to use "throw ex".
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MIN/MAX vs ORDER BY and LIMIT
...d field, using MIN() requires a single full pass of the table. Using SORT and LIMIT requires a filesort. If run against a large table, there would likely be a significant difference in percieved performance. As a meaningless data point, MIN() took .36s while SORT and LIMIT took .84s against a 106...
Python Pandas merge only certain columns
...e to only merge some columns? I have a DataFrame df1 with columns x, y, z, and df2 with columns x, a ,b, c, d, e, f, etc.
5...