Something I have found myself doing often lately is declaring typedefs relevant to a particular class inside that class, i.e. class Lorem { typedef boost::shared_ptr<Lorem> ptr; typedef std::vector<Lorem::ptr> vector; // // … // }; These types are then used elsewhere in the code: Lorem::vector lorems; Lorem::ptr lorem( new Lorem() ); lorems.push_back( lorem ); Reasons I … Read more
I’d like to write this typedef void (*FunctionPtr)(); using using. How would I do that? 5 Answers 5
I haven’t written any C++ in years and now I’m trying to get back into it. I then ran across this and thought about giving up: typedef enum TokenType { blah1 = 0x00000000, blah2 = 0X01000000, blah3 = 0X02000000 } TokenType; What is this? Why is the typedef keyword used here? Why does the name … Read more
I have to define a 24-bit data type.I am using char[3] to represent the type. Can I typedef char[3] to type24? I tried it in a code sample. I put typedef char[3] type24; in my header file. The compiler did not complain about it. But when I defined a function void foo(type24 val) {} in … Read more
I have always been a bit stumped when I read other peoples’ code which had typedefs for pointers to functions with arguments. I recall that it took me a while to get around to such a definition while trying to understand a numerical algorithm written in C a while ago. So, could you share your … Read more
Why won’t the compiler let me forward declare a typedef? Assuming it’s impossible, what’s the best practice for keeping my inclusion tree small? 10 Answers 10
What is the advantage of using uint8_t over unsigned char in C? I know that on almost every system uint8_t is just a typedef for unsigned char, so why use it? 8 Answers 8
Coming from a C and C++ background, I found judicious use of typedef to be incredibly helpful. Do you know of a way to achieve similar functionality in Java, whether that be a Java mechanism, pattern, or some other effective way you have used? 12 Answers 12
Is there a typedef equivalent in C#, or someway to get some sort of similar behaviour? I’ve done some googling, but everywhere I look seems to be negative. Currently I have a situation similar to the following: class GenericClass<T> { public event EventHandler<EventData> MyEvent; public class EventData : EventArgs { /* snip */ } // … Read more
I have a class template<size_t N, size_t M> class Matrix { // …. }; I want to make a typedef which creates a Vector (column vector) which is equivalent to a Matrix with sizes N and 1. Something like that: typedef Matrix<N,1> Vector<N>; Which produces compile error. The following creates something similar, but not exactly … Read more
