Hi! I'd like to save any kind of functions/functors with void as parameter and as return-value in a container. I thought to use boost::bind: Let me show you some code: void bar( ) { } struct Foo { void operator(); }foo; typedef boost::signal<void ()> voidFunctionSig; std::vector< voidFunctionSig> voidFunctions; voidFunctionSig signal1; voidFunctionSig signal2; signal1.connect( &bar); signal2.connect( &foo); voidFunctions.push_back( signal1); //error voidFunctions.push_back( signal2); //same error I'm getting a Compiler-errors in the push_back-Lines: 'boost::signal<Signature>::__ctor': no nonexplicit constructor for implicit conversion: with [ Signature=void (void) ] and [ Signature=void (void) ] well, i'm not shure if boost::bind is the right choice at all, because I do not need multiple slots. Perhaps boost::bind/boost::mem_fn was enough but i cannot think how to use it. Can anybody help me to save my void (*)(void)-functions/functors and in a container? I could do it writing a superclass and a virtual op() but I would prefer to use ready-to-use boost-classes for this task. PS: using VC 7.1