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c++ boost::multi_index composite keys efficiency - c++1y / stl - 清泛IT社区，为创新赋能！
...performed by the first key, then the second key if the first one is equal, etc". Does this mean that the structure is stored such that a lookup for a specific 2-part composite key will take O(n=1) time, i.e. is the container sorted such that there is a pointer directly to each item, or does the...
Unicode equivalents for \w and \b in Java regular expressions?
...umber of marks, is problematic, because you should be able to describe all files as matching /^(\X*\R)*\R?$/, but you can’t if you have a \pM at the start of the file, or even of a line. So they’ve eXtended it to always match at least one character. It always did, but now it makes the above patt...
Why do I need 'b' to encode a string with Base64?
...
Short Answer
You need to push a bytes-like object (bytes, bytearray, etc) to the base64.b64encode() method. Here are two ways:
>>> data = base64.b64encode(b'data to be encoded')
>>> print(data)
b'ZGF0YSB0byBiZSBlbmNvZGVk'
Or with a variable:
>>> string = 'data to...
Run Java Code Online [closed]
codepad.org allow you to run C,C++,D etc code online but not Java... is there a site that I can use for Java?
9 Answers
...
jQuery parent of a parent
...= $(parent).parent();
var parentParentParent = $(parentParent).parent();
etc.
Difference between jQuery `click`, `bind`, `live`, `delegate`, `trigger` and `on` functions (with an
...use these when your elements may change, e.g. adding new rows, list items, etc. If you don't have a parent/common ancestor that will stay in the page and not be replaced at any point, use .live(), like this:
$(".clickAlert").live('click', function() {
alert("A click happened");
});
If however ...
How to unzip a list of tuples into individual lists? [duplicate]
...elements from all inputs, starting with the first values, then the second, etc. By using *l you apply all tuples in l as separate arguments to the zip() function, so zip() pairs up 1 with 3 with 8 first, then 2 with 4 and 9. Those happen to correspond nicely with the columns, or the transposition of...
What's the difference between QMainWindow, QWidget and QDialog?
...tions to make it work well with common buttons on dialogs (accept, reject, etc.).
QMainWindow is designed around common needs for a main window to have. It has predefined places for a menu bar, a status bar, a toolbar, and other widgets. It does not have any built-in allowances for buttons like Q...
Getting a structural type with an anonymous class's methods from a macro
...hat class that's statically typed as a structural type with those methods, etc. This is possible with the macro system in 2.10.0, and the type member part is extremely easy:
...
What is the 'dynamic' type in C# 4.0 used for?
...ble to interact with an Object without having to cast it.
dynamic cust = GetCustomer();
cust.FirstName = "foo"; // works as expected
cust.Process(); // works as expected
cust.MissingMethod(); // No method found!
Notice we did not need to cast nor declare cust as type Customer. Because we declared...