all of keyboard notes

with the same type of tr1::shared_ptr, does the compiler instantiate a generalization copy constructor?As I said, the member template has no rules to modify the language. "If you need a copy constructor and you don't declare it yourself, the compiler will generate a" this rule is also one of them. Declaring a generalization copy constructor (a member template) in a class does not prevent the compiler from generating their own copy constructors (non-template), so if you want to control

() Other cluster tools Using less RAM IPython #memit Array module Dawg/dafsa Marisa Trie (Static tree) Datrie (need an alphabet to contain all the keys?) ） HAT trie HTTP microservices (using flask): https://github.com/j4mie/postcodeserver/ Probabilistic Data Structures hyperloglog++ structure? Very Approximate counting with a 1-byte Morris Counter 2^exponent, updating using pro

/* - * SYSTEM FOLDER NAME - */ - $system _path= ' System '; - - /* in * Application FOLDER NAME - */ to $application _folder= ' Application '; + - /* the * Resolve The system path for increased reliability * */ $ if(defined(' STDIN '))Panax Notoginseng { - chdir(dirname(__file__)); the } + A if(Realpath($system _path) !==FALSE) the { + $system _path=Realpath($system _path).‘ /‘; - } $ $ $system _path=RTrim($system _path, ‘/‘).‘ /‘; - - if( !Is_dir($system _path)) the { - Exi

CI Framework source Reading notes 2 all the entrance index.php,ciindex.php In the previous section (CI Framework source reading note 1-environment preparation, basic terminology, and framework process), we mentioned the basic process of the CI framework, where we post the flowchart again for reference: As the CI framework of the entry file, source reading, naturally began. In the process of reading the sou

. Consider the implementation of the comparable interface1. The Comparato method is not a method in object, but is the only method in the comparable interface. This method can not only compare equivalence, but also make sequential comparisons.2, the General Convention of the interface is defined by the Equals method, but the ordered set uses the equivalence test of the CompareTo method.3, if it is a value class, and has a clear intrinsic ordering relationship, because it is determined to impleme

CI framework Source Code Reading Notes 2 all entries index. php, ciindex. php In the previous section (CI framework Source Code Reading Note 1-Environment preparation, basic terms, and Framework processes), we mentioned the basic process of the CI framework. Here we will paste a flowchart for your reference: As the entry file of the CI framework, the source code is read, and thus it naturally begins. In th

Reading Notes Objective c ++ Item 24 if all parameters of a function require type conversion, declare the function as a non-member function. objective is a non-member function.1. If you declare a function that requires implicit type conversion as a member function, a problem may occur. It is a bad idea to make classes support implicit conversion. Of course, there are exceptions. The most common example is t

QT Learning notes, using Qdir to get all the directory and file information in the current directory #include

Sublimecodeintel Features: Code intelligence hints (with custom functions) shortcut key: ALT + left mouse button go to function declaration Sublimelinter Features: Code detection YUI Compressor function: Js/css code compression

//mdy - //These 2 sentences must be replaced by the following 2 sentences, otherwise, when the multi-layer nesting (that is, there are scrolling up and down and left and right scrolling) will turn to one side roll up and down, but in fact we just need to focus on a certain direction - //deltax = this.hashorizontalscroll? point.pagex-this.pointx:0, the //DeltaY = this.hasverticalscroll? point.pagey-this.pointy:0, -DeltaX = Point.pagex- This. Pointx, -DeltaY = Poin

similarities between the two, the cache is actually cached in the recent hot spot data, and LOG analysis can be deleted, that is, will not run out of storage space24:facebook 2011:batching IO, avoid hbase hot keys?Java Sharding plan: Hand slicing? This is supposed to be before the data center.10000 Writes per sec per Server25, Dropbox 2011:python for backend and client (Python write Tortoisehg/mercury actually good performance, sublime not also python write); but it can't be used on Android (-_

Java Study Notes-before the 0918 class flood event in Silicon Valley *: before coming to Beijing, just like all college students, they worried about the next step in their lives. Before the 0918 class flood event In many cases, you often do not know what will happen in your life in the next minute. Maybe you are still wandering in the first second, but you may gain hope in the next second. Before coming to

CI framework Source Code Reading Notes 2 all entries index. php In the previous section (CI framework Source Code Reading Note 1-Environment preparation, basic terms, and Framework processes), we mentioned the basic process of the CI framework. Here we will paste a flowchart for your reference: As the entry file of the CI framework, the source code is read, and thus it naturally begins. In the process of r

expense of transitivity. Consider colored dots CP1 (1,2,red), CP2 (1,2,blue) and normal point P (forThere is cp1.equals (p) = True, P.equals (CP2), but Cp1.equals (CP2). is a violation of transitivity.We cannot expand a class that can be instantiated while adding a new value component and preserving the equals convention.How to solve it?Composition takes precedence over inheritance.Instead of inheriting the point class, we create a new ColorPoint class that joins a reference to the point class.

. '); - } + } A at /* - * SYSTEM FOLDER NAME - */ - $system _path= ' System '; - - /* in * Application FOLDER NAME - */ to $application _folder= ' Application '; + - /* the * Resolve The system path for increased reliability * */ $ if(defined(' STDIN '))Panax Notoginseng { - chdir(dirname(__file__)); the } + A if(Realpath($system _path) !==FALSE) the { + $system _path=Realpath($system _path).‘ /‘; - } $ $ $system _path=RTrim($system _path, ‘/‘).‘ /‘; - - if( !Is_dir($system

classa{Private: intA; Public: A (intx): A (x) {} Aoperator*(Constax) {returnA (A *x.a); }};intMain () {A A (2); A b= A*a;//No problemA B = A *2;//since the constructor has no explicit, there is no problem with the implicit conversion.A B =2A//it's a problem.}The teacher said that one kind is the member function of the class, one is the Non-member function,But we try not to apply friend to encapsulation, we can use the data by modifying the interface of the classclassa{Private: intA; Public

(k)) {_func_.call ( ThisK This. Get (k)); } }; Object_list.prototype.get_with_default=function(k,d) {return This. has (k)? This. Get (k):d; }; Object_list.prototype. for=function () { varf = arguments[0]; varRstr= arguments[1]! = Undefined?arguments[1]: ""; varR = (R.tolowercase (). IndexOf ("r")! =-1)?true:false; for(varKinch This. Object) { if(!R) {f (k,0, This. Object[k]); }Else{ if(Is_array ( This. Object[k])) { for(varJinch

function, and are scoped to start with the definition of the variable and at the end of the program file. Because functions can be considered as separate program fragments in PHP, local variables are visible, so there are two ways to use global variables in functions that cannot use global variables directly: Use the Global keyword to define the target variable to tell the function body Word variable to global variable use special PHP custom $globals array 8.4.3 static variable local varia

) {PhoneNumber pn=NewPhoneNumber (707, 867, 5309); MapNewHashmap(); M.put (PN,"Jenny"); System.out.println (M.get (Pn.clone ())); }}View Codeis to implement the Cloneable interface, and then overwrite the Clone method in the object class. First call Super.clone, then strongly turn to the current class, and then make some corrections. For example, arrays, references.At this point, the clone of the array is also extended.The first method, then declares an array, iterates through the original ar

shift()method to remove the first element in the array unshift()method to add one or more elements to the front of the array pop()method to delete the last element in the array Performance testing of Push and unshiftArray push() and unshift() methods can be added to the current array element, the difference is that it is push() added at the end, but unshift() it is added at the beginning, from the principle can be known, unshift() the efficiency is low. The reason is that every