小编Nav*_*vid的帖子

试图编译以下代码我得到这个编译错误,我该怎么办？

ISO C++禁止获取非限定或带括号的非静态成员函数的地址,以形成指向成员函数的指针.

class MyClass {
   int * arr;
   // other member variables
   MyClass() { arr = new int[someSize]; }

   doCompare( const int & i1, const int & i2 ) { // use some member variables } 

   doSort() { std::sort(arr,arr+someSize, &doCompare); }

}; 

我的问题是,当我想创建一个下载的库时,我从GCC得到一些奇怪的编译错误,编译器要求纠正的代码似乎是正确的.

错误都是这样的:

Catalogue.h:96:错误:'strlen'没有依赖于模板参数的参数,因此'strlen'的声明必须是可用的

这是第96行的代码:

GaCatalogueEntry(const char* name, T* data)
{
    if( name )
    {
        _nameLength = (int)strlen( name ); // LINE 96

        // copy name
        _name = new char[ _nameLength + 1 ];
        strcpy( _name, name );       // LINE 100: similar error

        _data = data;

        return;
    }

    _name = NULL;
    _nameLength = 0;
    _data = NULL;
}

我该怎么做才能解决这些编译错误？

访问方法"foo"的不同线程是否有自己的局部变量副本,还是需要使此方法同步？

class X {
   static returnType foo( Object arg) {
      Object localvar;
      // perform some calculation based on localvar and arg.
      // no non-local variable is used i.e: this is a utility method.
      // return something.
   }
}

当我尝试从mysql数据库加载一个对象(一行)时,字符串属性未正确加载,因此当我打印它们时,不会显示任何内容.

这是我的hibernate配置文件:

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration SYSTEM 
          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
  <session-factory>    
    <property name="connection.driver_class">
       com.mysql.jdbc.Driver
    </property>
    <property name="connection.url">
      jdbc:mysql://localhost:3306/demo_hib_1
    </property>
    <property name="connection.username">root</property>
    <property name="connection.password"> </property>
    <property name="pool_size">5</property>
    <property name="show_sql">true</property>
    <property name="dialect">
      org.hibernate.dialect.MySQLDialect
    </property>
    <!-- Mapping files -->

     <mapping resource="com/navid/Person.hbm.xml"/>

  </session-factory>
</hibernate-configuration>

我尝试将连接url添加到编码中:

jdbc:mysql://localhost:3306/demo_hib_1&characterEncoding=UTF-8

并获得了hibernate异常:

Exception in thread "main" org.hibernate.HibernateException: Could not parse configuration: /hibernate.cfg.xml
    at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:2246)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:2158)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:2137)
    at com.navid.Main.main(Main.java:31)
Caused by: org.dom4j.DocumentException: Error on line 10 of document  : The reference to entity "characterEncoding" must end with the …