I'm trying to use boost::signal to implement a callback mechanism, and I'm getting a memory access assert in the boost::signal code on even the most trivial usage of the library. I have simplified it down to this code: #include <boost/signal.hpp> typedef boost::signal<void (void)> Event; int main(int argc, char* argv[]) { Event e...
I am using boost::signal in a native C++ class, and I now I am writing a .NET wrapper in C++/CLI, so that I can expose the native C++ callbacks as .NET events. When I try to use boost::bind to take the address of a member function of my managed class, I get compiler error 3374, saying I cannot take the address of a member function unless...
I make my boost::signals public because I'm lazy. class Button { public: signal<void()> clicked; }; int main() { Button btn; btn.clicked.connect(handleClick); } ... rather than encapsulating with a Button::OnClicked(boost::function<void()>). Is this going to come back and bite me? ...
I get why boost::signal is noncopyable (it's because copying a signal doesn't have a clear meaning), but I need a version of it that does provide some sort of copy ctor (either a no-op or one that copies all connections). The reason I need this is because in my project many objects become noncopyable just by virtue of featuring signals,...
I’m aware of the tutorial at boost.org addressing this Boost.org Signals Tutorial, but the examples are not complete and somewhat over simplified. I’m a C# programmer that got put on a C++ project so my C++ is a little rough. The examples there don’t show the include files and some sections of the code are a little vague for me. Here is...
I am running function Foo from somebody else's library in a single-threaded application currently. Most of the time, I make a call to Foo and it's really quick, some times, I make a call to Foo and it takes forever. I am not a patient man, if Foo is going to take forever, I want to stop execution of Foo and not call it with those argum...
I'm having a hell of a time trying to debug some kind of memory access error, which I believe is a double free. The code is too complex to post, but I can try to describe it. Basically, I have two threads. When the worker thread is created, it instantiates a new boost::signal object, and stores it in a shared_ptr. The parent then querie...
There is a signal and several objects with slots. I want to implement the behavior when one object calls signal and blocks its own connection. I guess a small snippet will be more informative: typedef boost::signal<void()> TSignal; template<class TSignal> class SlotObject { public: void Connect(boost::shared_ptr<TSignal> pSignal...
Hi, I'm using boost::signals and leaking memory when I try to connect multiple signals to a single slot_type. I've seen this same leak reported on various forums, but can't find any that mention the correct way to do this, or any workaround. What I am trying to do: I am trying to pass the result of boost::bind() into a function. In th...
I am getting such a crash: #0 0x90b05955 in __gnu_debug::_Safe_iterator_base::_M_detach #1 0x90b059ce in __gnu_debug::_Safe_iterator_base::_M_attach #2 0x90b05afa in __gnu_debug::_Safe_sequence_base::_M_detach_all #3 0x000bc54f in __gnu_debug::_Safe_sequence_base::~_Safe_sequence_base at safe_base.h:170 #4 0x000aac05 in __gnu_debug...
I read at multiple places that Boost.Signals is not threadsafe but I haven't found much more details about it. This simple quote doesn't say really that much. Most applications nowadays have threads - even if they try to be single threaded, some of their libraries may use threads (for example libsdl). I guess the implementation doesn't ...
Hello, I am using the boost library and my question is about boost::signals. I have a signal that might call many different slots but only one slot will match the call so I want this particular slot to return true and that the calling will stop. Is it possible? Is it efficient? Can you guys suggest me a better way to do it if it's not ef...
In QT we can connect signals and slots using the following simple syntax: connect(pObject1, signal1, pObject2, slot2) For instance, one can write something like: A a; B b; connect(&a, SIGNAL(valueChanged(int)), &a, SLOT(setValue(int))); With Boost::Signal the syntax we would write it this way: A a; B b; a.valueChanged.conn...
I know that boost.asio has a mechanism that calls a callback function whenever a packet is received but is there an option to emit a signal instead? Do I have to write a function that emits the signal? If it is so, why? ...
This line of code compiles correctly without a problem: boost::bind(boost::ref(connected_), boost::dynamic_pointer_cast<session<version> >(shared_from_this()), boost::asio::placeholders::error); However when assigning it to a boost::function or as a callback like this: socket_->async_connect(connection_->r...
Is it possible to block the removal of certain slots from a signal in the boost.signals library? If so how should a code that does such a thing will look like? Do I need to create a derived class just for that specific signal to do so? ...
I've currently got a class that can notify a number of other objects via callbacks: class Callback { virtual NodulesChanged() =0; virtual TurkiesTwisted() =0; }; class Notifier { std::vector<Callback*> m_Callbacks; void AddCallback(Callback* cb) {m_Callbacks.push(cb); } ... void ChangeNodules() { for (iterator it=m...
I'm building with g++, and yesterday a helpful person on SO told me to compile with the -D_GLIBCXX_DEBUG and -D_GLIBCXX_DEBUG_PEDANTIC flags. I did so, and I spent most of yesterday tweaking my code to conform to these flags. Now it's complaining about my use of boost::signal, and I'm not sure where the problem is. I have a class Yarl...
I have a class Yarl in my code with a member function refresh that I want to bind to two boost::signals. One of these signals is a member of a class EventHandler defined like this: class EventHandler { public: boost::signal<void()> sigRefresh; }; The other is a free floating signal in another file declared like this: nam...
Since I love progamming in both C# and C++, I'm about to implementing a C#-like event system as a solid base for my planned C++ SFML-GUI. This is only an excerpt of my code and I hope this clarifies my concept: // Event.h // STL headers: #include <functional> #include <type_traits> #include <iostream> // boost headers: #include <boost/...