Summary of common usage of [C + +] set
I. concept
set is a standard association container in STL. It uses a balanced search tree - red black tree to implement the underlying layer. When inserting and deleting operations, only pointer operation nodes are needed to complete, which does not involve memory movement and copy, so the efficienc ...
Posted by willythemax on Sun, 15 Mar 2020 20:55:58 -0700
ffplay -- source code analysis: code architecture
/* Minimum SDL audio buffer size, in samples. */
// Minimum audio buffer
#define SDL_AUDIO_MIN_BUFFER_SIZE 512
/* Calculate actual buffer size keeping in mind not cause too frequent audio callbacks */
// To calculate the actual audio buffer size, you do not need to call back too often. The maximum numb ...
Posted by swatisonee on Sun, 15 Mar 2020 04:47:17 -0700
JS node access add, delete, modify and query (attach node access compatibility writing method of low version browser)
Node access add, delete, modify and query
And get page element type, but node operation uses node level relationship to get elements
Getting elements by parent-child sibling relationship
Logical, but less compatible
Generally, a node has at least three basic attributes: nodeType, nodeName and nodeVal ...
Posted by jek1134 on Sat, 14 Mar 2020 20:50:20 -0700
Getting started with Go language - process control
go process control
String explanation
String principle
The bottom layer of string is a byte array, so it can be converted to and from [] byte type
Characters in a string cannot be modified
String is composed of byte, so the length of string is the length of byte
The run type (int32 in four bytes) is used to represent utf8 characters. A run co ...
Posted by fredted40x on Sat, 14 Mar 2020 08:37:41 -0700
Java IO details -- byte stream and character stream
1, Byte stream overview
Byte stream is divided into byte output stream and byte input stream
Byte stream directly operates on binary data; byte stream is generally used to operate on media files, such as pictures
2, Byte output stream
outputStream in java is an abstract class that controls ...
Posted by ashton321 on Sat, 14 Mar 2020 06:18:19 -0700
Classification algorithm - K-nearest neighbor algorithm (with case and test data)
One definition
If most of the k most similar samples in the feature space belong to a certain category, then the sample also belongs to this category.
1.1 distance formula
The distance between two samples can be calculated by the following formula, also called Euclidean distance
II. Analysis of fi ...
Posted by aclees86 on Sat, 14 Mar 2020 04:17:16 -0700
Understanding of SurfaceFlinger (12) in Android GUI system
Link to the general outline of this series of articles: surface flinger series of articles of Android GUI system
Summary & description of key points in this chapter:
The mind map of this chapter is as above. This paper mainly introduces the concept of FrameBuffer, mainly focuses on the basic ...
Posted by russia5 on Fri, 13 Mar 2020 22:37:38 -0700
Surface flinger (01) display system framework of Android GUI system
Link to the general outline of this series of articles: surface flinger series of articles of Android GUI system
Summary & description of key points in this chapter:
The mind map of this chapter is as above. It mainly describes the basis of the display system, understands the relationship be ...
Posted by ChaosXero on Fri, 13 Mar 2020 22:22:55 -0700
The summary of js anti shake and throttle
In recent projects, the test proposed that clicking the button quickly for many times would trigger multiple calls of the interface. Later, when querying the data, you can use the anti shake optimization, which just integrates the use of anti shake and throttling for your own learning
Code:
<!DOCTYPE html>
<html>
<head>
...
Posted by shamuraq on Fri, 13 Mar 2020 03:24:07 -0700
bmp image graying and binarization
C language removes the background of bmp picture
I. Preface
2, Grayscale
Header file
C file
3, Binarization
I. Preface
In image processing, most of the processing methods need to convert color image into gray image in advance to carry out relevant calculation and recognition.
The principle of ...
Posted by robb73 on Thu, 12 Mar 2020 06:05:26 -0700