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Why use #ifndef CLASS_H and #define CLASS_H in .h file but not in .cpp?
...le (usually) is compiled. In simple terms, this means the compiler will take your .cpp file, open any files #included by it, concatenate them all into one massive text file, and then perform syntax analysis and finally it will convert it to some intermediate code, optimize/perform other tasks, and ...
What is the point of a private pure virtual function?
...s and you need to provide a new implementation only for the method, that takes two ints as arguments.
class MyTurbochargedV8 : public Engine
{
public:
// To prevent SetState( int var, bool val ) from the base class,
// from being hidden by the new implementation of the other overload (below...
How do I request a file but not save it with Wget? [closed]
I'm using Wget to make http requests to a fresh web server. I am doing this to warm the MySQL cache. I do not want to save the files after they are served.
...
Looping through the content of a file in Bash
... this has the side effects of trimming leading whitespace, interpreting backslash sequences, and skipping the last line if it's missing a terminating linefeed. If these are concerns, you can do:
while IFS="" read -r p || [ -n "$p" ]
do
printf '%s\n' "$p"
done < peptides.txt
Exceptionally, ...
Difference between filter and filter_by in SQLAlchemy
...
filter_by is used for simple queries on the column names using regular kwargs, like
db.users.filter_by(name='Joe')
The same can be accomplished with filter, not using kwargs, but instead using the '==' equality operator, which has been overloaded on the db.users.name object:
db.users.filter(d...
GRANT EXECUTE to all stored procedures
...
Antony ScottAntony Scott
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Why are #ifndef and #define used in C++ header files?
I have been seeing code like this usually in the start of header files:
4 Answers
4
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What exactly is a Context in Java? [duplicate]
...rt which can have any influence on the behaviour of the current unit of work. E.g. the running environment used, the environment variables, instance variables, local variables, state of other classes, state of the current environment, etcetera.
In some API's you see this name back in an interface/c...
Why isn't sizeof for a struct equal to the sum of sizeof of each member?
...ation.
In addition, atomicity and other concurrency-guarantees might be broken, leading to subtle errors.
Here's an example using typical settings for an x86 processor (all used 32 and 64 bit modes):
struct X
{
short s; /* 2 bytes */
/* 2 padding bytes */
int i; /* 4 bytes...
How to see query history in SQL Server Management Studio
...
[Since this question will likely be closed as a duplicate.]
If SQL Server hasn't been restarted (and the plan hasn't been evicted, etc.), you may be able to find the query in the plan cache.
SELECT t.[text]
FROM sys.dm_exec_cached_plans AS p
CROSS APP...