(C++) BoostSignals2Example4

 

 

Boost.Signals2 example 4 is a Boost.Signals2 example.

Technical facts

 

Operating system(s) or programming environment(s)

• Lubuntu 15.04 (vivid)

IDE(s):

• Qt Creator 3.1.1

Project type:

• Console application

C++ standard:

• C++98

Compiler(s):

• G++ 4.9.2

Libraries used:

• STL: GNU ISO C++ Library, version 4.9.2

 

 

 

 

 

Qt project file: ./CppBoostSignals2Example4/CppBoostSignals2Example4.pro

 

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include(../../ConsoleApplication.pri) include(../../Libraries/Boost.pri) SOURCES += main.cpp

 

 

 

 

 

./CppBoostSignals2Example4/main.cpp

 

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#include <cassert> #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Weffc++" #pragma GCC diagnostic ignored "-Wunused-local-typedefs" #pragma GCC diagnostic ignored "-Wunused-but-set-parameter" #include <boost/signals2.hpp> #pragma GCC diagnostic pop void EmptySlot() {} int main() {   boost::signals2::signal<void()> signal;   //A signal is connected to no slots   assert(signal.num_slots() == 0);   signal.connect(EmptySlot);   //Adding a slot increases num_slots   assert(signal.num_slots() == 1);   signal.connect(EmptySlot);   //Adding the same slot again increases num_slots   assert(signal.num_slots() == 2);   //Disconnect that slot removes both connections   signal.disconnect(EmptySlot);   assert(signal.num_slots() == 0); }