大约有 40,000 项符合查询结果（耗时：0.0494秒） [XML]
What are inline namespaces for?
C++11 allows inline namespace s, all members of which are also automatically in the enclosing namespace . I cannot think of any useful application of this -- can somebody please give a brief, succinct example of a situation where an inline namespace is needed and where it is the most idiomatic s...
Replace a value in a data frame based on a conditional (`if`) statement
In the R data frame coded for below, I would like to replace all of the times that B
appears with b .
8 Answers
...
Can a decorator of an instance method access the class?
I have something roughly like the following. Basically I need to access the class of an instance method from a decorator used upon the instance method in its definition.
...
Pros and cons of Java rules engines [closed]
... good. Could you please tell me where to use drool and where to Jess? Basically , I'm expecting the answer more related diff. b/w drool and Jess.
– Tony
Jul 1 '10 at 17:58
7
...
How do exceptions work (behind the scenes) in c++
...
Instead of guessing, I decided to actually look at the generated code with a small piece of C++ code and a somewhat old Linux install.
class MyException
{
public:
MyException() { }
~MyException() { }
};
void my_throwing_function(bool throwit)
{
if (...
How do I list all files of a directory?
How can I list all files of a directory in Python and add them to a list ?
21 Answers
...
Why do you create a View in a database?
...joining several tables, or has complex logic or calculations, you can code all that logic into a view, then select from the view just like you would a table.
2. Views can be used as a security mechanism
A view can select certain columns and/or rows from a table (or tables), and permissions set on ...
Difference between numeric, float and decimal in SQL Server
...Avoid using float or real columns in WHERE clause search conditions, especially the = and <> operators (Technet)
so generally because the precision provided by decimal is [10E38 ~ 38 digits] if your number can fit in it, and smaller storage space (and maybe speed) of Float is not important a...
Fixing slow initial load for IIS
... know, the timeout exists to save memory that other websites running in parallel on that machine might need. The price being that one time slow load time.
Besides the fact that the app pool gets shutdown in case of user inactivity, the app pool will also recycle by default every 1740 minutes (29 ho...
How to get a password from a shell script without echoing
...
Some shells allow you to specify the prompt for the read command: read -s -p "Password:" password
– Gordon Davisson
Oct 20 '10 at 19:40
...