member

I have a question about the member variables of static struct in C language. Someone said we can declare a static struct , but in C, struct do not have the static members like class in C++, what does this mean? If I declare a static struct, what is the status of the members variable? can some one help me on this? Note that a static struct itself is different from a static member of a struct. While you can declare a static struct variable: static struct MyStruct s; you can't define a struct type with a static member: struct MyStruct { static int i; // <- compiler error }; The reason for this is

I could be totally wrong here, but as I understand it, C++ doesn't really have a native "pointer to member function" type. I know you can do tricks with Boost and mem_fun etc. But why did the designers of C++ decide not to have a 64-bit pointer containing a pointer to the function and a pointer to the object, for example? What I mean specifically is a pointer to a member function of a particular object of unknown type . I.E. something you can use for a callback . This would be a type which contains two values. The first value being a pointer to the function , and the second value being a

This question already has an answer here: Start thread with member function 5 answers I'm just starting to use C++ 11 threads and I've been struggling on a (probably silly) error. This is my example program: #include <iostream> #include <thread> #include <future> using namespace std; class A { public: A() { cout << "A constructor\n"; } void foo() { cout << "I'm foo() and I greet you.\n"; } static void foo2() { cout << "I'm foo2() and I am static!\n"; } void operator()() { cout << "I'm the operator(). Hi there!\n"; } }; void hello1() { cout << "Hello from outside class A\n"; } int main() { A

If I have a nested class like so: class MyClass { class NestedClass { public: // nested class members AND definitions here }; // main class members here }; Currently, the definitions of MyClass are in the CPP file but the definitions for NestedClass are in the header file, that is, I cannot declare the functions/constructors in the CPP file. So my question is, how do I define the functions of NestedClass in the cpp file? If I cannot, what is the reason (and if this is the case, I have a vague idea of why this happens but I would like a good explanation)? What about structures? sje397 You can.

Is it possible to have non-type template parameter which is actually a pointer to a class member? What I'm looking to do is something like the following: struct Person { Dog dog; }; template <?? ptr> struct Strange { // ... }; typedef Strange<&Person::dog> weird; My work so far leads me to believe that nothing of the sort is possible, but I'm curious if anyone has can say otherwise. From the standard: A non-type template-parameter shall have one of the following (optionally cv-qualified) types: integral or enumeration type, pointer to object or pointer to function, reference to object or

I'm working with a particle simulation library. The way interactions are added to particles it through the following library function: AddInteraction(ParticleSet particleSet, void(*interaction)(xyz* p, xyz* v)) I now want to pass a member function to AddInteraction. I've understood that this is impossible to do without changing the library function. Changing the library is something I'd like to avoid, but if the change is small I can mail the author of the library and ask for it to be implemented. I want to write a simple example of how it can be done. Different solutions are possible: Lambda