Ray's playground

摘要： Implicit conversion can be suppressed by declaring a constructor explicit. That is, anexplicitconstructor will be invoked only explicitly. In particular, where a copy constructor is in principleneeded... 阅读全文

摘要： Occasionally, a member function is logically const, but it still needs to change the value of a member.To a user, the function appears not to change the state of its object. However, some detail thatt... 阅读全文

摘要： In C and older C++ programs, the keyword static is (confusingly) used to mean ‘‘use internallinkage’’.　　Consequently, the rule in the standard that says that there must be a un... 阅读全文

摘要： A using directivemakes names from a namespace available almost as if they had been declaredoutside their namespace. 阅读全文

摘要： Return types are not considered in overload resolution. For some functions, it is not possible to specify the number and type of all arguments expected in acall. Such a function is declared by termina... 阅读全文

摘要： Although Spring’s POJO-based development model offers a compelling alternativeto Enterprise JavaBeans, there may be factors (either technical, political, or historical)that force a project to ch... 阅读全文

摘要： In the end, a JSP is just a servlet.　　The Container generates a class from your JSP thatimplements the HttpJspPage interface. This is the onlypart of the generated servlet’s API that you need to... 阅读全文

摘要： The free store operators new, delete, new[], and delete[] are implemented using functions:　　void* operator new(size_t); // space for individual object　　void operator delete(void*);　　void* operator new... 阅读全文

摘要： No object is allocated with the address 0 . Consequently, 0 acts as a pointer literal, indicatingthat a pointer doesn’t refer to an object.　　The declarator operator that makes a pointer constant... 阅读全文

摘要： 1 = sizeof(char) <= sizeof(short)<=sizeof(int)<=sizeof(long)　　1<=sizeof(bool)<=sizeof(long)　　sizeof(char)<=sizeof(wchar_t)<=sizeof(long)　　sizeof(float)<=sizeof(double)<=size... 阅读全文