size of empty class

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

Beginners in the study of object-oriented programming language, more or less questions, we write the code and the final compiled code is very different, we do not know what the compiler does in the background to do the work. These are the reasons

Transferred from: http://blog.sina.com.cn/s/blog_93b45b0f01015s95.htmlWe often encounter these problems:(1) C + + defines an empty class, what is its size (sizeof)?(2) The size of a class that has only one char data member?(3) Can I define an empty

// This is an empty test, only the test size Class {}; Class B {}; Class C: Public { Virtual void fun () = 0; }; Class D: Public B, public C {}; // Cout // Cout // Cout // Cout // The output result of the program execution is: // // Sizeof (A)

Examples of file reading and writing in PythonWhen beginners are learning object-oriented programming languages, they are more or less doubtful that the code we write is quite different from the code that was compiled in the end, and we don't know

Today's interview is an interesting question: what is the amount of memory that an empty struct occupies in C + +? See the following code:#include struct s0{}; int Main () { sizeof S0 std::endl; return 0 ;}The interviewer alerted me on the

  This article mainly tests the class size, including empty classes, static and non-static variables, virtual and non-virtual single inheritance and multi-inheritance classes, and class or object   Test whether the virtual table and virtual pointer

# Include Using namespace STD;Class A // A is an empty class. The compiler will mark this class with a char type and the size is 1.{ };Class B: public a // B inherits a, but it is also an empty class with the size of 1{ };Class C: VirtualPublic A //

Use empty () instead of checking whether size () is empty For any container C, write down If (C. Size () = 0 )... Essentially equivalent to writing If (C. Empty ())...   This is an example. You may wonder why a constructor is better than another one,

What is empty class and why worth Optimization Empty class is an empty class, such class empty {};Here, empty is obviously an empty class and has no members. However, empty classes are not limited to this form. For classes that only have member