Level 1: DataSet Creation Knowledge points 1. Strongly typed DataSet creation (1) Create a DataSet using a sequence of basic types ## Create a collection val seq = Seq(1,2,3,4) ## Call toDS() method val ds: Dataset[Int] = seq.toDS() ds.show() (2) Use the sample class sequence to create a DataSet (the sample class cannot be located […]
Tag: typed
Summary of lambda anonymous, using and typedef in C++ [Full] (249)
Introduction: CSDN blog expert, focusing on Android/Linux System, share multi-mic voice solutions, audio and video, codec and other technologies, and grow with everyone! Quality Column:Audio Engineer Advanced Series[Original information is being updated continuously… ] Life motto: There are never shortcuts in life, only actions It is the only cure for fear and laziness. For more […]
23-24C++ (48)–Character array, structure, strong enumeration, macro definition + strcpy_s(a, “ABC”) + strlen (a) + typedef
1. Character array Although the string type is more convenient in many aspects of processing strings, it is always at a disadvantage compared to char arrays in terms of calculation speed, and there is no string type in the C language. For subsequent data structure and algorithm courses, as well as hardware development courses, you […]
Do you know statically typed Python?
As we all know, python is a dynamically typed language. However, starting from the v3.6 version, static typing is supported > way of writing. Understanding python‘s static types helps us encapsulate tools and libraries that are more reliable and easier to maintain. Dynamic and static types Dynamic and static types are originally an indicator of […]
typename, typedef, using comparison
In the C++ standard library, because the class inheritance relationship is more complicated and templates are used more often, the source code is filled with the three keywords typename, typedef and using. 1. typename keyword 1.1. The first function of typename is to be used in templates to declare a certain type. template<typename _Tp, typename […]
C preprocessing instructions, typedef
1 Integrated development environment keil-MDK is an integrated development environment that integrates a complete development solution including C compiler, macro assembly, linker, library management and simulation debugger; 1.1 Preprocessor: Process comments and preprocessing instructions; generate .i files; 1.2 Compiler: Perform syntactic analysis and compilation of files processed by the preprocessor to generate .s files; 1.3 […]
[QandA C++] Summary of key knowledge such as sizeof, strlen, static, extern, typedef, const, #define, inline functions, etc.
Table of Contents The difference between sizeof and strlen static extern “C” typedef const #defineMacro definition Comparison of constants defined by const and #define inline function The difference between inline functions and #define The difference between sizeof and strlen sizeof is an operator and strlen is a library function. The parameters of sizeof can be […]
Parameter initialization based on GPIO_InitTypeDef
Table of Contents 1. Introduction to GPIO_InitTypeDef 2. Structure members and detailed explanations (1), GPIO_Pin (2), GPIO_Mode 1. GPIO_MODE_INPUT: 2. GPIO_MODE_OUTPUT_PP: push-pull output mode 3. GPIO_MODE_OUTPUT_OD: open-drain output mode 4. GPIO_MODE_AF_PP: 5. GPIO_MODE_AF_OD: (3) GPIO_Speed: (4), GPIO_OType (5), GPIO_PuPd Write on the back: 1. Introduction to GPIO_InitTypeDef GPIO_InitTypeDef is a structure type used to configure […]
c++ define, typedef, using
define #define is a macro definition command. Macro definition is to define an identifier as a string. The identifier in the source program is replaced by the specified string. It is a precompilation command, so it will be executed during the precompilation stage. The general form of a parameterless macro definition is: #define identifier string […]
[C language] Keyword analysis (2) typedef and #define and their differences
Article directory typedef keyword define keyword #define with parameters The difference between typedef and #define typedef keyword The typedef keyword is the abbreviation of type define. I read in a book before that maybe this keyword should be called typerename. I personally agree with this view. Because this keyword only renames the existing type. A […]