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How to forward declare a template class in namespace std?
... even such a forward declaration in namespace std is explicitly prohibited by the standard: the only thing you're allowed to put in std is a template specialisation, commonly std::less on a user-defined type. Someone else can cite the relevant text if necessary.
Just #include <list> and don't...
How to execute raw SQL in Flask-SQLAlchemy app
...they're raw SQL or not. This ensures that the queries are properly managed by a transaction, which allows multiple queries in the same request to be committed or rolled back as a single unit. Going outside the transaction using the engine or the connection puts you at much greater risk of subtle, po...
Round to 5 (or other number) in Python
...o see why the above works. You want to make sure that your number divided by 5 is an integer, correctly rounded. So, we first do exactly that (round(float(x)/5) where float is only needed in Python2), and then since we divided by 5, we multiply by 5 as well. The final conversion to int is because...
EC2 instance types's exact network performance?
...
Bandwidth is tiered by instance size, here's a comprehensive answer:
For t2/m3/c3/c4/r3/i2/d2 instances:
t2.nano = ??? (Based on the scaling factors, I'd expect 20-30 MBit/s)
t2.micro = ~70 MBit/s (qiita says 63 MBit/s) - t1.micro gets about...
Setting property 'source' to 'org.eclipse.jst.jee.server:JSFTut' did not find a matching property
...eem to help my similar issue, which was a web.xml issue, which I found out by checking the context.xml which had this line in the <Context> section:
<WatchedResource>WEB-INF/web.xml</WatchedResource>
The solution in WARNING: Setting property 'source' to 'org.eclipse.jst.jee.serve...
Remove the last line from a file in Bash
...
@Miro : By no means is $ d a regex. It is a sed command. d is the command for deleting a line, while $ means "the last line in the file". When specifying a location (called "range" in sed lingo) before a command, that command is only...
round up to 2 decimal places in java? [duplicate]
...ecome 395.03. I can see why as 395034 is nearest long that is then divided by 100. However I think generally people would expect the result as 395.04.
– Vishal Saxena
Oct 3 '18 at 15:46
...
C++ Convert string (or char*) to wstring (or wchar_t*)
... string in your example (おはよう) is a UTF-8 encoded (which it isn't, by the looks of it, but let's assume it is for the sake of this explanation :-)) representation of a Unicode string of your interest, then your problem can be fully solved with the standard library (C++11 and newer) alone.
T...
What is a fat JAR? [duplicate]
...use the group is
org.apache.maven.plugins ...which is assumed by default.
-->
<artifactId>maven-assembly-plugin</artifactId>
<version>2.6</version>
<configuration>
<descriptorRefs>
<descript...
How to see log files in MySQL?
...s)
The Slow Query Log. Ιt consists of "slow" SQL statements (as
indicated by its name).
By default no log files are enabled in MYSQL. All errors will be shown in the syslog (/var/log/syslog).
To Enable them just follow below steps:
step1: Go to this file (/etc/mysql/conf.d/mysqld_safe_syslog.cn...