empty class

From: http://blog.csdn.net/smstong/article/details/6578389 1. Test code [CPP]ViewPlaincopy # Include # Include Using namespace STD; Class cempty { }; Int main (INT argc, char ** argv) { Cempty * pobjinheap = new cempty (); Cempty

1, why the size of the class is not allowed in C + + is 0Class Zerosizet {}; Zerosizet Z[10];&z[i]-&z[j]; is usually obtained by dividing the number of bytes between two addresses by the type size, while the type size is 0 will be problematic2, why

I. background of EBOWe know that an empty class contains no non-static data members and no virtual pointers (including pointers to virtual function tables and virtual base class sub-objects ), its size is usually 1. Of course, in some alignment

Parse the local method to map the data types at the Java layer, and map the data types at the java layer.Preface The Java language defines different data types, such as basic types int and double, and all classes parent class objects. These are Java-

Transferred from: http://www.cppblog.com/thesys/articles/116985.htmlBrief introductionThe keyword static_assert is introduced in c++0x, which is used to make assertions during compilation, so it is called a static assertion.Its syntax is

Brief introductionThe keyword static_assert is introduced in c++0x, which is used to make assertions during compilation, so it is called a static assertion.Its syntax is simple:static_assert(constant expression, hint-string).If the value of the

1. Dispatch There is a template function below, assuming an animal shelter organization provides it and they accept all the poor animals that are homeless, so they provide a function to the outside world to accept registration. The function looks

Memory Distribution (upper) and VS distribution of classes in 0. Order I am currently studying C ++. I am also interested in the Implementation Principles of C ++ classes and their classes. So we plan to better understand the implementation of

A deep understanding of the C ++ object model and a deep understanding of the c Object Model The C ++ object model is an important knowledge point. It learns the memory model of the C ++ object, you can understand the polymorphism principle in C ++,

A class includes member variables: static and non-static, and member functions include static, non-static, and virtual.How are these items allocated in the memory? Here is an example: Class cobject{Public:Static int;Cobject ();~ Cobject ();Void

After a period of debugging analysis, found that there is a function to write a very messy, it is estimated that the revision of the time has not changed, after a period of time to modify debugging, finally the normal generation of the 4-level page,

After a period of debugging analysis, found that there is a function to write a very messy, it is estimated that the revision of the time has not changed, after a period of time to modify debugging, finally the normal generation of the 4-level page,

C + + object model is an important point of knowledge, learning the memory model of C + + object, we can understand the polymorphism principle in C + +, the class initialization order problem, the class size problem and so on.1 C + + object Model

After a period of debugging analysis, found that a function to write a very messy, it is estimated that the revision of the time has not changed, after a period of time to modify debugging, and finally the normal generation of 4-level page, not

is a header file in the C + + standard library that defines some of the iterator template classes in the C + + STL standard, which are derived from Std::iterator as base classes. An iterator provides the ability to manipulate a collection (container)

0. OrderCurrently learning C + +, the implementation principles of C + + classes and their classes are also very interesting. It is intended to better understand the implementation of classes by observing the distribution of classes in memory.

First, how much space does an empty class occupy?   Class base{Public:Base ();~ Base ();};   Note that the constructor and destructor are declared here, but the result of sizeof (base) is 1. Because an empty class also needs to be instantiated, the

The following discussion is the result of not using #pragma pack (num), where num indicates how many bytes are aligned. When beginners are learning object-oriented programming languages, they are more or less doubtful that the code we write is quite

The object is not referenced to the instance, that is, the NullReferenceException exception. I believe this is one of the most common errors in c # programming. At least this exception will be thrown many times during project creation. Every time

1, switch parameters Why can not be a real typeBecause the switch can only be automatically converted to shaping (including shaping) type, such as the character type char,unsigned int, and so on, the real type cannot be automatically converted to