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Is it possible to make a type only movable and not copyable?
... that is, when you define a new type it doesn't implement Copy unless you em>x m>plicitly implement it for your type:
struct Triplet {
one: i32,
two: i32,
three: i32
}
impl Copy for Triplet {} // add this for copy, leave it out for move
The implementation can only em>x m>ist if every type conta...
How to create a trie in Python
... _end). (It's like a version of get that also updates the dictionary.)
Nem>x m>t, a function to test whether the word is in the trie:
>>> def in_trie(trie, word):
... current_dict = trie
... for letter in word:
... if letter not in current_dict:
... return False
.....
Difference between python3 and python3m em>x m>ecutables
... is the difference between the /usr/bin/python3 and /usr/bin/python3m em>x m>ecutibles?
1 Answer
...
二维码的生成细节及原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...下二维码一共有40个尺寸。官方叫版本Version。Version 1是21 m>x m> 21的矩阵，Version 2是 25 m>x m> 25的矩阵，Version 3是29的尺寸，每增加一个version，就会增加4的尺寸，公式是：(V-1)*4 + 21（V是版本号） 最高Version 40，(40-1)*4+21 = 177，所以最高是177...
JavaScript inheritance: Object.create vs new
In JavaScript what is the difference between these two em>x m>amples:
4 Answers
4
...
What is the reason for having '//' in Python? [duplicate]
...less one of the operands was already a floating point number.
In Python 2.m>X m>:
>>> 10/3
3
>>> # to get a floating point number from integer division:
>>> 10.0/3
3.3333333333333335
>>> float(10)/3
3.3333333333333335
In Python 3:
>>> 10/3
3.3333333333333...
@class vs. #import
...ver 'MyCoolClass' is a forward class and corresponding @interface may not em>x m>ist
you need to #import the file, but you can do that in your implementation file (.m), and use the @class declaration in your header file.
@class does not (usually) remove the need to #import files, it just moves the re...
How can I dynamically create derived classes from a base class
For em>x m>ample I have a base class as follows:
3 Answers
3
...
SQL Joins Vs SQL Subqueries (Performance)?
...
I would Em>X m>PECT the first query to be quicker, mainly because you have an equivalence and an em>x m>plicit JOIN. In my em>x m>perience IN is a very slow operator, since SQL normally evaluates it as a series of WHERE clauses separated by "OR" (W...
Common MySQL fields and their appropriate data types
...ut brackets around their area code.
In general though, I seem to almost em>x m>clusively use:
INT(11) for anything that is either an ID or references another ID
DATETIME for time stamps
VARCHAR(255) for anything guaranteed to be under 255 characters (page titles, names, etc)
TEm>X m>T for pretty much ever...