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What's the difference between assignment operator and copy constructor?
I don't understand the difference between assignment constructor and copy constructor in C++. It is like this:
8 Answers
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Constantly print Subprocess output while process is running
...d stdout_line
popen.stdout.close()
return_code = popen.wait()
if return_code:
raise subprocess.CalledProcessError(return_code, cmd)
# Example
for path in execute(["locate", "a"]):
print(path, end="")
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ORA-30926: unable to get a stable set of rows in the source tables
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This is usually caused by duplicates in the query specified in USING clause. This probably means that TABLE_A is a parent table and the same ROWID is returned several times.
You could quickly solve the problem by using a DISTINCT in your query (in fact, if 'Y' is a constant val...
Parsing query strings on Android
...() worked, but was deprecated in L, and removed in M.
So the best answer now is UrlQuerySanitizer. This has existed since API level 1 and still exists. It also makes you think about the tricky issues like how do you handle special characters, or repeated values.
The simplest code is
UrlQuerySan...
Where to store global constants in an iOS application?
... way, you can switch between servers depending on compiler flags, as in:
#ifdef DEBUG
#define kBaseURL @"http://192.168.0.123/"
#else
#define kBaseURL @"http://myproductionserver.com/"
#endif
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Count how many records are in a CSV Python?
...akes for an efficient counter, avoiding storing the whole file in memory.
If you already read 2 rows to start with, then you need to add those 2 rows to your total; rows that have already been read are not being counted.
sh...
Rails params explained?
...which is the most common, the params are encoded in the url. For example, if a user's browser requested
http://www.example.com/?foo=1&boo=octopus
then params[:foo] would be "1" and params[:boo] would be "octopus".
In HTTP/HTML, the params are really just a series of key-value pairs where the...
Change the image source on rollover using jQuery
...on() {
var src = $(this).attr("src").match(/[^\.]+/) + "over.gif";
$(this).attr("src", src);
})
.mouseout(function() {
var src = $(this).attr("src").replace("over.gif", ".gif");
$(this).attr("src", src);
});
});
For those tha...
Django - how to create a file and save it to a model's FileField?
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In addition to this, I got an error if I don't specify the file mode while opening the file. So, f = open('/path/to/file', 'r') For ZIP kind of file, f = open('/path/to/file.zip', 'rb')
– rajagopalx
Dec 14 '17 at 19:43
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SQL Server 2008 can't login with newly created user
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I think it's good because it lets potential responders know that the problem is resolved. It also contributes to a growing body of documentation that other developers can use to find their own answers in the future.
– Joe Mayo
Nov 13 '09 at ...