vintage vector

The arraylist, inclulist, and vestor classes all implement the java. util. List interface, but they have different features, mainly as follows: I,Synchronization Arraylist and inclulist are not synchronized, while vestor is. Therefore, if thread security is required, arraylist or javaslist can be used to save costs for synchronization. But in the case of multithreading, sometimes we have to use vector. Of course, you can also package arraylist and his

Vector series in practice c ++ -- sort the vector (unique_ptr (string) using the sort algorithm (sort function error "two parameters should be input, but three parameters are provided) Previously, I wrote a blog post on sorting the vector using the sort algorithm.vector > . Today, let's write a pairvector > Use the sort algorithm for sorting. # In

In practice, the vector series in c ++ -- vector (unique_ptr () initialization (Ownership Transfer) C ++ 11 provides us with smart pointers and brings us a lot of convenience. What if unique_ptr is used as an element of the vector container? The format is exactly the same:vector > vec; But how to add elements to vec? See the following: # Include

Vector initialization and traversal-dtor-blog Vector initialization and traversal STD: Vector Int > Inttest; For(IntI=0; I10;++I){Inttest. push_back (I );} For (STD: Vector Int > : Iterator ITER = Inttest. Begin (); ITER ! = Inttest. End (); ++ ITER){STD: cout * ITER STD: Endl

For vector usage, the additional time consumed by copying data to prevent reallocate memory. The following two combinations can be used to prevent reallocate. 1. Vector: resize () using array index 2. Vector: Reserve () Use push_back (). So I tested these two cases on the Windows 2003 platform, and compared them with 3 in which push_back () is directly

Today we want to use vector to realize the function of two-dimensional array, and try to put the two-dimensional vector. Who knows when he got started, he met Ray. The form of the code is roughly as follows: VECTOR The vacuuming operation was performed because the two-dimensional vector was reused. However, th

C ++ is based on the vector graphics library cairo graphics, vector graphics cairo // Sudo apt-get install libcairo2-dev // pkg-config -- cflags -- libs cairo //-I/usr/include/cairo-I/usr/include/glib-2.0-I /usr/lib/x86_64-linux-gnu/glib-2.0/include-I/usr/include/pixman-1-I/usr/include/freetype2-I/usr/include/libpng12-lcairo # include Compilation in Ubuntu: G ++ 'pkg-config -- cflags cairo 'test_cairo.cpp

more and more widely valued. Statistical Learning Theory is based on a solid set of theories and provides a unified framework for solving the problem of Finite Sample learning. It can include many existing methods and is expected to help solve many difficult problems (such as Neural Network Structure Selection and Local Minimization). At the same time, based on this theory, a new general learning method-Support Vector Machine (SVM) has been developed

In practice, the vector series in c ++ -- the second worst iterator failed (deleting elements in the vector) Directly refer to the Code: # Include # Include Using namespace std; int main () {vector V; v. push_back (1); v. push_back (2); v. push_back (3); std: vector : Itera

Previous blogs have talked about some of the ways to use Std::find and std::find_ if. But there is no telling of the classes stored in vectors that are defined by themselves. So how do you use Std::find and std::find_if to find it?First define a class:classitem{Private:STD::stringM_itemid;intM_price;intM_count; Public: Item (STD::stringIdintPriceintcount): M_itemid (ID), M_count (count), M_price (price) {}intGetCount ()Const{returnM_count; }STD::stringGetitemid ()Const{returnM_itemid; }intGetPri

The actual deletion element in the C + + vector uses the std::vector::erase () method in the container Vecrot.Std::remove () in C + + does not delete the element because the container's size () does not change, only the replacement of the element.1.std::vector::erase ()Function prototype: Iterator erase (iterator position); Delete the specified elementIterator Er

Today, I have nothing to do with it. I 've been reading about it for a long time on my computer. When I saw 43rd entries, I found that, as mentioned above, the algorithm replaces the manual loop. No doubt arises. I remember the operator [] operation (subscript operation) was the most efficient loop when I read the vector source code ). The algorithm is fast. The following is a test code: // Test class and call Function Class AAA{Public:Void MakeFul

C ++ Study Notes (15th): How the vector object grows in the memory space, learning notes vector How does a vector object increase in memory? We all know that vector objects are dynamically stored. From this point of view, they are a bit like linked lists, which can dynamically increase or decrease elements. We also kn

Vector series in practice c ++ -- use std: find and std: find_if algorithms for vector (custom class) Previously, my blog talked about some usage of std: find and std: find _ if, but not about the custom class stored in the vector. How to Use std:: find and std: find_if? First define a class: class Item{private: std::string m_ItemId; int m_Price; int m_

In practice, the vector series in c ++ -- Some vector exceptions Today, we will write some vector exceptions that can be captured. Out_of_rangeThe array is out of bounds. The vector automatically increases the capacity, but if the index exceeds the current size, an exception is thrown. # Include # Include

I write a simple program to distinguish between the vector container size () and the capacity () function, where the capacity function is to reserve space for the vector container, without having to reallocate the memory every time the element is added, thus improving the efficiency a lot. I through a small program to study, the following is the program and running results, more concise can be seen capacity

JQuery generates the svg vector QR code and jquerysvg Vector JQuery generates a vector svg QR code and provides PNG and SVG page downloads to relieve pressure on the server. The Code is as follows: The above section describes how to use jQuery to generate an svg vector QR code. I hope it will be helpful to you. If you

As in the title, if I were to answer before, I would say, yes, in the multi-threaded environment to operate the vector, do not need to add synchronized.But I accidentally saw an article today, I found that my previous idea was wrong, the address of this article:http://zhangbq168.blog.163.com/blog/static/2373530520082332459511/I extract the key part:Vectors are slower than ArrayList because the vectors themselves are synchronized, and ArrayList is notT

Android5.0 vector animation-[initial recognition of Vector Graphics SVG and VectorDrawable], Android5.0 + advanced animation Development describes how to use VectorDrawable technology, besell curve technology, and PathMeasure technology to achieve cool animation. What are the points worth learning about Frame Animation, intercept animation, and attribute animation compared to the previously learned frame an

C ++ Primer Study Notes: Add programming assumptions contained in elements to a vector object, cprimer vector When practicing section 3.14 in C ++ Primer: # Include The program reports the following error: Error: use of undeclared identifier 'vector' Insert a row: # Include To: # Include So that no error is reported. Note thatVectorNamespace required