<<Effective C++>>备忘

最新推荐文章于 2022-10-11 21:39:34 发布
原创 最新推荐文章于 2022-10-11 21:39:34 发布 · 488 阅读 · 0 ·
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博客主要介绍了C++中的几个重要知识点，包括指针的指针与指针的引用对比，用const和inline取代#define，不同形式的const修饰指针的区别，以及static成员变量的定义和声明，强调类的静态成员需在实现代码文件中定义。

1、(pointer to pointer)VS(reference to pointer)
2、const和inline取代#define
3、const char* p、char const* p、char* const p、const char* const p区别
4、static成员变量的定义和声明

class GamePlayer
{
private:
static const int NUM_TURNS ; //constant eclaration
};

还有一点，正如你看到的，上面的语句是NUM_TURNS的声明，而不是定义，所以你还必须在类的实现代码文件中定义类的静态成员：

const int GamePlayer::NUM_TURNS=5; //definition
5、


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D:\biancheng\yf服务器代码\jdwlw>mvn clean package [INFO] Scanning for projects... [WARNING] [WARNING] Some problems were encountered while building the effective model for jdwlw:jdwlw:war:0.0.1-SNAPSHOT [WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-compiler-plugin is missing. @ line 365, column 12 [WARNING] [WARNING] It is highly recommended to fix these problems because they threaten the stability of your build. [WARNING] [WARNING] For this reason, future Maven versions might no longer support building such malformed projects. [WARNING] [INFO] [INFO] ----------------------------< jdwlw:jdwlw >----------------------------- [INFO] Building maven Maven Webapp 0.0.1-SNAPSHOT [INFO] from pom.xml [INFO] --------------------------------[ war ]--------------------------------- Downloading from aliyun: https://maven.aliyun.com/repository/public/com/google/code/ksoap2/ksoap2-base/3.6.4/ksoap2-base-3.6.4.pom [WARNING] The POM for com.google.code.ksoap2:ksoap2-base:jar:3.6.4 is missing, no dependency information available Downloading from aliyun: https://maven.aliyun.com/repository/public/com/google/code/ksoap2/ksoap2-base/3.6.4/ksoap2-base-3.6.4.jar [INFO] ------------------------------------------------------------------------ [INFO] BUILD FAILURE [INFO] ------------------------------------------------------------------------ [INFO] Total time: 1.518 s [INFO] Finished at: 2025-06-22T23:18:56+08:00 [INFO] ------------------------------------------------------------------------ [ERROR] Failed to execute goal on project jdwlw: Could not resolve dependencies for project jdwlw:jdwlw:war:0.0.1-SNAPSHOT: com.google.code.ksoap2:ksoap2-base:jar:3.6.4 was not found in https://jitpack.io during a previous attempt. This failure was cached in the local repository and resolution is not reattempted until the update interval of jitpack.io has elapsed or updates are forced -> [Help 1] [ERROR] [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch. [ERROR] Re-run Maven using the -X switch to enable full debug logging. [ERROR] [ERROR] For more information about the errors and possible solutions, please read the following articles: [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/DependencyResolutionException 解决上述报错。pom.xml:<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>jdwlw</groupId> <artifactId>jdwlw</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>war</packaging> <name>maven Maven Webapp</name> <url>http://maven.apache.org</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> </properties> <repositories> <repository> <id>jitpack.io</id> <url>https://jitpack.io</url> </repository> <!-- 可选的阿里云镜像加速 --> <repository> <id>aliyun</id> <name>Aliyun Maven</name> <url>https://maven.aliyun.com/repository/public</url> <releases> <enabled>true</enabled> </releases> <snapshots> <enabled>false</enabled> </snapshots> </repository> </repositories> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency> <!-- <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.1.0</version> </dependency> --> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>2.5</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>4.1.6.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>4.1.6.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>4.1.6.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>4.1.6.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>4.1.6.RELEASE</version> </dependency> <!-- https://mvnrepository.com/artifact/org.ksoap2/ksoap2 --> <dependency> <groupId>com.google.code.ksoap2</groupId> <artifactId>ksoap2-base</artifactId> <version>3.6.4</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>4.1.6.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>4.1.6.RELEASE</version> </dependency> <!-- <dependency> <groupId>org.springframework</groupId> <artifactId>spring-orm</artifactId> <version>4.1.6.RELEASE</version> </dependency> --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-orm</artifactId> <version>3.2.13.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context-support</artifactId> <version>3.2.2.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc-portlet</artifactId> <version>4.1.6.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-expression</artifactId> <version>4.1.6.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aspects</artifactId> <version>4.1.6.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-websocket</artifactId> <version>4.1.6.RELEASE</version> </dependency> <dependency> <groupId>quartz</groupId> <artifactId>quartz</artifactId> <version>1.5.2</version> </dependency> <dependency> <groupId>org.apache.ibatis</groupId> <artifactId>ibatis-sqlmap</artifactId> <version>2.3.4.726</version> </dependency> <!-- <dependency>--> <!-- <groupId>com.ibatis</groupId>--> <!-- <artifactId>ibatis2-sqlmap</artifactId>--> <!-- <version>2.1.7.597</version>--> <!-- </dependency>--> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency> <dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.4</version> </dependency> <dependency> <groupId>commons-logging</groupId> <artifactId>commons-logging</artifactId> <version>1.2</version> </dependency> <dependency> <groupId>commons-lang</groupId> <artifactId>commons-lang</artifactId> <version>2.6</version> </dependency> <dependency> <groupId>commons-dbcp</groupId> <artifactId>commons-dbcp</artifactId> <version>1.4</version> </dependency> <dependency> <groupId>commons-pool</groupId> <artifactId>commons-pool</artifactId> <version>1.6</version> </dependency> <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.3.1</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.35</version> </dependency> <dependency> <groupId>com.belerweb</groupId> <artifactId>pinyin4j</artifactId> <version>2.5.0</version> </dependency> <dependency> <groupId>jstl</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> <dependency> <groupId>com.google.code.gson</groupId> <artifactId>gson</artifactId> <version>2.5</version> </dependency> <dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> <version>4.4.1</version> </dependency> <dependency> <groupId>javax.mail</groupId> <artifactId>mail</artifactId> <version>1.5.0-b01</version> </dependency> <!-- 激光消息推送Starts --> <dependency> <groupId>cn.jpush.api</groupId> <artifactId>jpush-client</artifactId> <version>3.1.3</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>1.7.5</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>1.7.5</version> </dependency> <dependency> <groupId>com.google.guava</groupId> <artifactId>guava</artifactId> <version>17.0</version> </dependency> <dependency> <groupId>com.squareup.okhttp</groupId> <artifactId>mockwebserver</artifactId> <version>1.5.4</version> <scope>test</scope> </dependency> <!-- 激光消息推送END --> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi</artifactId> <version>3.11</version> </dependency> <dependency> <groupId>net.sf.ehcache</groupId> <artifactId>ehcache</artifactId> <version>2.10.0</version> </dependency> <dependency> <groupId>javax.servlet.jsp</groupId> <artifactId>jsp-api</artifactId> <version>2.2</version> </dependency> <dependency> <groupId>com.lowagie</groupId> <artifactId>itext</artifactId> <version>2.1.7</version> </dependency> <!-- https://mvnrepository.com/artifact/commons-net/commons-net --> <dependency> <groupId>commons-net</groupId> <artifactId>commons-net</artifactId> <version>3.3</version> </dependency> <!-- https://mvnrepository.com/artifact/com.mchange/c3p0 --> <dependency> <groupId>com.mchange</groupId> <artifactId>c3p0</artifactId> <version>0.9.5.2</version> </dependency> <!-- https://mvnrepository.com/artifact/org.apache.ws.commons.axiom/axiom-api --> <dependency> <groupId>org.apache.ws.commons.axiom</groupId> <artifactId>axiom-api</artifactId> <version>1.2.13</version> </dependency> <!-- https://mvnrepository.com/artifact/dom4j/dom4j --> <dependency> <groupId>dom4j</groupId> <artifactId>dom4j</artifactId> <version>1.6.1</version> </dependency> <!-- https://mvnrepository.com/artifact/org.apache.axis/axis --> <dependency> <groupId>org.apache.axis</groupId> <artifactId>axis</artifactId> <version>1.4</version> </dependency> <!-- https://mvnrepository.com/artifact/javax.xml.rpc/javax.xml.rpc-api --> <dependency> <groupId>javax.xml.rpc</groupId> <artifactId>javax.xml.rpc-api</artifactId> <version>1.1.1</version> </dependency> <!-- https://mvnrepository.com/artifact/org.apache.axis2/axis2 --> <dependency> <groupId>org.apache.axis2</groupId> <artifactId>axis2</artifactId> <version>1.7.6</version> <type>pom</type> </dependency> <!-- https://mvnrepository.com/artifact/org.apache.axis2/axis2-adb --> <dependency> <groupId>org.apache.axis2</groupId> <artifactId>axis2-adb</artifactId> <version>1.7.6</version> </dependency> <!-- https://mvnrepository.com/artifact/soap/soap --> <dependency> <groupId>soap</groupId> <artifactId>soap</artifactId> <version>2.3</version> </dependency> <!-- https://mvnrepository.com/artifact/commons-httpclient/commons-httpclient --> <dependency> <groupId>commons-httpclient</groupId> <artifactId>commons-httpclient</artifactId> <version>3.1</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.9.10.4</version> </dependency> <dependency> <groupId>org.eclipse.paho</groupId> <artifactId>org.eclipse.paho.client.mqttv3</artifactId> <version>1.2.0</version> </dependency> <dependency> <groupId>cn.hutool</groupId> <artifactId>hutool-all</artifactId> <version>5.7.2</version> </dependency> </dependencies> <build> <finalName>jdwlw</finalName> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <configuration> <source>1.8</source> <target>1.8</target> <encoding>utf-8</encoding> <compilerArguments> <extdirs>${project.basedir}/src/main/webapp/WEB-INF/lib</extdirs> </compilerArguments> </configuration> </plugin> </plugins> <resources> <resource> <directory>src/main/resources</directory> <includes> <include>**/*.properties</include> <include>**/*.xml</include> </includes> <filtering>false</filtering> </resource> <resource> <directory>src/main/java</directory> <includes> <include>**/*.properties</include> <include>**/*.xml</include> </includes> <filtering>false</filtering> </resource> </resources> </build> </project>
最新发布
06-23
修改后的插件配置：```xml<plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><version>3.8.1</version><configuration><source>1.8</source><target>1.8</target>...
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