大约有 46,000 项符合查询结果（耗时：0.0703秒） [XML]
C++: variable 'std::ifstream ifs' has initializer but incomplete type
...is is pretty noobish, but I'm pretty new to C++. I'm trying to open a file and read it using ifstream :
1 Answer
...
MySQL Select minimum/maximum among two (or more) given values
...
You can use LEAST and GREATEST function to achieve it.
SELECT
GREATEST(A.date0, B.date0) AS date0,
LEAST(A.date1, B.date1) AS date1
FROM A, B
WHERE B.x = A.x
Both are described here http://dev.mysql.com/doc/refman/5.0/en/comparison-...
What is the meaning of prepended double colon “::”?
...wered Nov 24 '10 at 16:27
Wyatt AndersonWyatt Anderson
8,42811 gold badge1919 silver badges2424 bronze badges
...
jQuery Set Cursor Position in Text Area
...osition in a text field using jQuery? I've got a text field with content, and I want the users cursor to be positioned at a certain offset when they focus on the field. The code should look kind of like this:
...
How do I explicitly specify a Model's table-name mapping in Rails?
I have a Model class called Countries and I want it to map to a DB table called 'cc'.
2 Answers
...
using data-* attribute with thymeleaf
... edited Feb 17 '17 at 8:01
Alexandru Severin
5,01399 gold badges3737 silver badges6060 bronze badges
answered Jun 26 '14 at 14:04
...
Get all non-unique values (i.e.: duplicate/more than one occurrence) in an array
...
You could sort the array and then run through it and then see if the next (or previous) index is the same as the current. Assuming your sort algorithm is good, this should be less than O(n2):
const findDuplicates = (arr) => {
let sorted_ar...
Should logger be private static or not
...advantage is in turn that you have to declare it in every individual class and take care in every class that the right classname is been used during logger's construction because getClass() cannot be used in static context. However, in the average IDE you can create an autocomplete template for this...
What does __FILE__ mean in Ruby?
... file foo.rb, __FILE__ would be interpreted as "foo.rb".
Edit: Ruby 1.9.2 and 1.9.3 appear to behave a little differently from what Luke Bayes said in his comment. With these files:
# test.rb
puts __FILE__
require './dir2/test.rb'
# dir2/test.rb
puts __FILE__
Running ruby test.rb will output
...
How can I determine whether a Java class is abstract by reflection
I am interating through classes in a Jar file and wish to find those which are not abstract. I can solve this by instantiating the classes and trapping InstantiationException but that has a performance hit as some classes have heavy startup. I can't find anything obviously like isAbstract() in the C...