...without using typedef. My boss claims he was once asked this in an interview, and when he gave his answer the interviewers told him he couldn't use typedefs because it was poor style. Regardless, he likes to throw the question out at people just to see if they can get it right , usually at new programmer lunches. No one ever gets ...
I have a C++ class 'Expression' with a method I'd like to use in my Objective-C class 'GraphVC'. class Expression { double evaluate(double); } And my Objective-C class: @implementation GraphVC : UIViewController { - (void)plot:(double(*)(double))f; @end I thought that it would be easiest to pass around function pointers that ta...
I want to call the base class implementation of a virtual function using a member function pointer. class Base { public: virtual void func() { cout << "base" << endl; } }; class Derived: public Base { public: void func() { cout << "derived" << endl; } void callFunc() { void (Base::*fp)() = &Base::func; ...
How would I create an array of ten function pointers? What I have is a for loop, and I want to set a function pointer to a different function on each iteration. so: //pseudocode for i (0..10) function = array_of_functions[i]; //... ...
How can I create a "function pointer" (and (for example) the function has parameters) in C? ...
So I have this code: #include "boost_bind.h" #include <math.h> #include <vector> #include <algorithm> double foo(double num, double (*func)(double)) { return 65.4; } int main(int argc, char** argv) { std::vector<double> vec; vec.push_back(5.0); vec.push_back(6.0); std::transform(vec.begin(), vec.end(), vec.begin(), boost::bi...
I'm trying to create a lookup table of member functions in my code, but it seems to be trying to call my copy constructor, which I've blocked by extending an "uncopyable" class. What I have is something like the following. enum {FUN1_IDX, FUN2_IDX, ..., NUM_FUNS }; class Foo { fun1(Bar b){ ... } fun2(Bar b){ ... } ... void (Foo...
How can i hash (std::tr1::hash or boost::hash) a c++ pointer-to-member-function? Example: I have several bool (Class::*functionPointer)() (not static) that point to several diferent methods of the class Class and i need to hash those pointer-to-member-function. How can i do that? Also how can i compare (std::less) those member funct...
Hi All, I want to write a function(say foo) which takes string as an argument and returns a function pointer ,however this pointer points to following function: DWORD WINAPI fThread1(LPVOID lparam) Also the function(foo) is member of a class so i will be defining it and declaring it in seperate files(header and .cpp files). Please h...
Hey guys, I'm writing a wrapper around a C library in Objective-C. The library allows me to register callback functions when certain events occur. The register_callback_handler() function takes a function pointer as one of the parameters. My question to you gurus of programming is this: How can I represent an Objective-C method call /...
I'm having trouble with some valarray function pointer code: double (*fp)(double) = sin; valarray<double> (*fp)(const valarray<double> &) = sin; The first compiles, the second gives: error: no matches converting function 'sin' to type 'class std::valarray<double> (*)(const class std::valarray<double>&)' ...
After reading this answer I thought I had a solution. At least the answer there is what I would like to do but I'm having a problem with the implementation. here is an outline of what I am trying to do typedef map<string, double*> myMap; typedef int (*ftwpt)(const char*, const struct stat*, int); typedef boost::function<int(const char...
I was asked a very interesting question during a C interview: How can you implement a function f() in such a way that it can only be called from a particular g() function. If a function other than g() tries to call f() it would result in a compiler error. At first, I though this could be done with function pointers and I could get close...
Hi, I have this function signature I have to match typedef int (*lua_CFunction) (lua_State *L);//target sig Here's what I have so far: //somewhere else... ... registerFunction<LuaEngine>("testFunc", &LuaEngine::testFunc, this); ... //0 arg callback void funcCallback0(boost::function<void ()> func, lua_State *state)...
Hi I'm having trouble compiling a simple piece of code. I am creating a class which implements a Deck of cards, and I want to create a shuffle method using the list::short method. Relevant code: deck.h #ifndef _DECK_H #define _DECK_H #include <list> #include <ostream> #include "Card.h" #include "RandomGenerator.h" using namespace s...
I have a functions nested relatively deeply in a set of tables. Is there a way in C/C++ to get a "reference" to that function and push that (and args) onto the stack when I need to use it? ...
What are all operations supported by function pointer differs from raw pointer? Is > , < , <= , >=operators supported by raw pointers if so what is the use? ...
I'm having a minor issue dealing with pointers to overloaded member functions in C++. The following code compiles fine: class Foo { public: float X() const; void X(const float x); float Y() const; void Y(const float y); }; void (Foo::*func)(const float) = &Foo::X; But this doesn't compile (the compiler complains that ...
Okay I have a bit of a problem which i'm struggling to solve. Basically I have an abstract functor class that overloads operator() and derived objects that implement it. I have a function (part of another class) that tries to take an Array of these functor classes and tries to pass a pointer to a member function to the std algorithm fo...
I've done a bit of reading online as to how to go about this and I think I'm doing it correctly... My goal is to have an array of structure objects that contain pointers to member-functions of a class. Here's what I have so far... typedef void (foo::*HandlerPtr)(...); class foo { public: void someFunc(...); // ... private: ...