wrapper

Closed . This question needs to be more focused. It is not currently accepting answers. Learn more . Want to improve this question? Update the question so it focuses on one problem only by editing this post . Closed 5 years ago . I am learning the concept of immutability. I understand that immutable objects cannot change their values once the object is created. But I didn't understand the following uses of immutable objects. They are are automatically thread-safe and have no synchronization issues. How ? Proof ? do not need a copy constructor. How ? Any example ? do not need an implementation

I was just wondering if there was a way to create a c wrapper API for a c++ class that has inheritance. Consider the following: class sampleClass1 : public sampleClass{ public: int get() { return this.data *2; }; void set(int data); } class sampleClass : public sample{ public: int get() { return this.data; } void set(int data) {this.data = data; } } class sample { public: virtual int get(); virtual void set(int data); private: int data; } How would I wrap the sampleClass1 to make it work in a c context ??? thanks, First, your sample should really get a proper virtual dtor. Next, just add one

I try to create a general wrapper function which takes any function as argument and also their parameters. Just something like the std::thread constructor. My current code is: #include <iostream> using namespace std; template<typename FUNCTION, typename... ARGS> void wrapper(FUNCTION&& func, ARGS&&... args) { cout << "WRAPPER: BEFORE" << endl; auto res = func(args...); cout << "WRAPPER: AFTER" << endl; //return res; } int dummy(int a, int b) { cout << a << '+' << b << '=' << (a + b) << endl; return a + b; } int main(void) { dummy(3, 4); wrapper(dummy, 3, 4); } The wrapper function itself works

I have the following situation in my python code: class Parent(object): def run(self): print "preparing for run" self.runImpl() print "run done" class Child(Parent): def runImpl(self): print "child running" However, I have several such 'decorators', doing different setup/teardown steps before and after 'runImpl', and I don't like having to define run() , runImpl() , runImplSingleProcess() etc. I am looking for a solution of the following form: class Parent(object): @wrapping_child_call def run(self, func_impl, *args, **kwargs) print "preparing for run" func_impl(*args, **kwargs) print "run

I want to be notified when a SocketChannel has its close method called. My first thought was to create a wrapper which notifies a listener when the implCloseSelectableChannel method is called (since the close method itself is declared final in AbstractInterruptibleChannel ). This solution works, but when I tried to register it with a Selector I would get an IllegalSelectorException because of the following check in SelectorImpl : /* */ protected final SelectionKey register(AbstractSelectableChannel paramAbstractSelectableChannel, int paramInt, Object paramObject) /* */ { /* 128 */ if (!

I am having trouble with an app where the SQLite database is getting corrupted. There was the odd case of this previously, but it seems to have become a lot more common after the release of iOS 7.1. I'm using the SQLite wrapper by Matteo Bertozzi that you can find here: https://github.com/ConnorD/simple-sqlite The database gets corrupted and spits out the error database disk image is malformed , some queries can be run but the existing data gets messed up. I have searched high and low and can't find a solution, I'm hoping someone here has some ideas since this is becoming a more common issue