在用#define 定义时 , 斜杠("\")是用来续行的,"#"用来把参数转换成字符串,是给参数加上双引号。"##"则用来连接前后两个参数,把它们变成一个字符串,"#@"是给参数加上单引号,使之成为一个字符。下面的例子会使您很容易理解。 #define Conn(x,y) x##y #define ToChar(a) #@a #define ToString(x...
As classes do pacote ga.views definem os provedores de dados que retornam conjuntos ou visualizações de seções e painéis em um Guia. ga.wrappers— pacote As classes do pacote ga.wrappers definem os layouts do Guia padrão que estão disponíveis na perspectiva Design do Guia ...
AI代码解释 #include<U8g2lib.h>#include<Wire.h>#defineSCL5#defineSDA4U8G2_SSD1306_128X64_NONAME_F_SW_I2Cu8g2(U8G2_R0,/*clock=*/SCL,/*data=*/SDA,/*reset=*/U8X8_PIN_NONE);voidsetup(){u8g2.begin();u8g2.enableUTF8Print();// enable UTF8 support for the Arduino print() f...
#define HELP_H class Help { public: Help(); ~Help(); void sayName(); protected: private: }; #endif // HELP_H 帮助文件 #include <iostream> #include "Help.h" using namespace std; Help::Help() { // Constructor } Help::~Help() { // Destructor } void Help::sayName() { cout ...
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no-use-before-define 变量必须先定义后使用详情 array-bracket-spacing 数组的括号内的前后禁止有空格详情 block-spacing 代码块如果在一行内,那么大括号内的首尾必须有空格详情 comma-spacing 逗号前禁止有空格,逗号后必须要有空格详情 comma-style 禁止在行首写逗号详情 ...
GitHub Advanced Security (or GHAS) is an application security solution that empowers developers. Advanced Security is embedded right into your workflow to help prevent vulnerabilities and credential leaks without slowing development. GitHub Advanced Security is like having your personal security ...
头文件中 #ifndef---#define---#endif的作用 首先#ifndef---#endif,#define是预处理命令,编译器在正式编译之前执行的命令。#ifndef---#endif是配套使用的条件编译指令,即如果#ifndef后的宏没有定义,则编译#ifndef---#endif之间的代码,否则不编译。
glib库的宏#define g_once_init_enter(location)怎么理解呢？宏定义如下：#ifdef __GNUC__ # define...
#define SCL_Pin GPIO_Pin_6 #define SDA_Pin GPIO_Pin_7 #define IIC_GPIO_PortGPIOBvoidIIC_Init(void){GPIO_InitTypeDef GPIO_InitStructure;RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);GPIO_InitStructure.GPIO_Pin=SCL_Pin|SDA_Pin;GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;//推挽输出...