編譯問題sigC++/gtkmm在自己的命名空間

Question

在項目中有我們自己的命名空間，我們想要包含一個使用gtkmm的GUI。

// in a header file: 
namespace project 
{ 
    // namespace "gui" is declared elsewhere  
    class gui::Config : Gtk::Window 
    { 
     protected: 
      Config(); 

     private: 
      // various Gtk::Widget objects 

      void connect_signals(); 

    }; 
} 

它所有的工作直到我嘗試實現這個方法：

void Config::connect_signals() 
{ 
    m_notebook.signal_switch_page().connect(sigc::mem_fun(*this,&Config::on_notebook_switch_page)); 
    m_button_save.signal_clicked().connect(sigc::mem_fun(*this,&Config::on_button_clicked_save)); 
    m_button_close.signal_clicked().connect(sigc::mem_fun(*this,&Config::on_button_clicked_close)); 
} 

然後我們使用pkg-config --cflags gtkmm-2.4和pkg-config --libs gtkmm-2.4編譯Config.cpp。

編譯器終於拋出了以下消息：

In file included from /usr/include/sigc++-2.0/sigc++/signal_base.h:29:0, 
     from /usr/include/sigc++-2.0/sigc++/signal.h:8, 
     from /usr/include/sigc++-2.0/sigc++/sigc++.h:23, 
     from /usr/include/glibmm-2.4/glibmm/signalproxy.h:13, 
     from /usr/include/glibmm-2.4/glibmm/objectbase.h:23, 
     from /usr/include/glibmm-2.4/glibmm/wrap.h:26, 
     from /usr/include/glibmm-2.4/glibmm/containerhandle_shared.h:25, 
     from /usr/include/glibmm-2.4/glibmm/arrayhandle.h:23, 
     from /usr/include/glibmm-2.4/glibmm.h:83, 
     from /usr/include/gtkmm-2.4/gtkmm.h:87, 
     from include/libproject.h:12, 
     from include/gui/Config.h:4, 
     from src/gui/Config.cpp:1: 
/usr/include/sigc++-2.0/sigc++/type_traits.h: In instantiation of ‘const bool sigc::is_base_and_derived<sigc::trackable, project::gui::Config>::value’: 
/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1922:26: instantiated from ‘sigc::bound_mem_functor2<void, project::gui::Config, _GtkNotebookPage*, unsigned int>’ 
src/gui/Config.cpp:70:94: instantiated from here 
/usr/include/sigc++-2.0/sigc++/type_traits.h:132:16: error: ‘sigc::trackable’ is an inaccessible base of ‘project::gui::Config’ 
In file included from /usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:9:0, 
     from /usr/include/sigc++-2.0/sigc++/functors/slot.h:7, 
     from /usr/include/sigc++-2.0/sigc++/signal_base.h:31, 
     from /usr/include/sigc++-2.0/sigc++/signal.h:8, 
     from /usr/include/sigc++-2.0/sigc++/sigc++.h:23, 
     from /usr/include/glibmm-2.4/glibmm/signalproxy.h:13, 
     from /usr/include/glibmm-2.4/glibmm/objectbase.h:23, 
     from /usr/include/glibmm-2.4/glibmm/wrap.h:26, 
     from /usr/include/glibmm-2.4/glibmm/containerhandle_shared.h:25, 
     from /usr/include/glibmm-2.4/glibmm/arrayhandle.h:23, 
     from /usr/include/glibmm-2.4/glibmm.h:83, 
     from /usr/include/gtkmm-2.4/gtkmm.h:87, 
     from include/libproject.h:12, 
     from include/gui/Config.h:4, 
     from src/gui/Config.cpp:1: 
/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h: In instantiation of ‘sigc::bound_mem_functor2<void, project::gui::Config, _GtkNotebookPage*, unsigned int>’: 
src/gui/Config.cpp:70:94: instantiated from here 
/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1922:26: error: ‘sigc::is_base_and_derived<sigc::trackable, project::gui::Config>::value’ is not a valid template argument for type ‘bool’ because it is a non-constant expression 
/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h: In instantiation of ‘sigc::bound_mem_functor0<void, project::gui::Config>’: 
src/gui/Config.cpp:72:95: instantiated from here 
/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1792:26: error: ‘sigc::is_base_and_derived<sigc::trackable, project::gui::Config>::value’ is not a valid template argument for type ‘bool’ because it is a non-constant expression 
/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h: In constructor ‘sigc::bound_mem_functor2<T_return, T_obj, T_arg1, T_arg2>::bound_mem_functor2(T_obj&, sigc::bound_mem_functor2<T_return, T_obj, T_arg1, T_arg2>::function_type) [with T_return = void, T_obj = project::gui::Config, T_arg1 = _GtkNotebookPage*, T_arg2 = unsigned int, sigc::bound_mem_functor2<T_return, T_obj, T_arg1, T_arg2>::function_type = void (project::gui::Config::*)(_GtkNotebookPage*, unsigned int)]’: 
/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:5501:77: instantiated from ‘sigc::bound_mem_functor2<T_return, T_obj, T_arg1, T_arg2> sigc::mem_fun(T_obj&, T_return (T_obj2::*)(T_arg1, T_arg2)) [with T_arg1 = _GtkNotebookPage*, T_arg2 = unsigned int, T_return = void, T_obj = project::gui::Config, T_obj2 = project::gui::Config]’ 
src/gui/Config.cpp:70:94: instantiated from here 
/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1908:18: error: using invalid field ‘sigc::bound_mem_functor2<T_return, T_obj, T_arg1, T_arg2>::obj_’ 
/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h: In constructor ‘sigc::bound_mem_functor0<T_return, T_obj>::bound_mem_functor0(T_obj&, sigc::bound_mem_functor0<T_return, T_obj>::function_type) [with T_return = void, T_obj = project::gui::Config, sigc::bound_mem_functor0<T_return, T_obj>::function_type = void (project::gui::Config::*)()]’: 
/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:5453:61: instantiated from ‘sigc::bound_mem_functor0<T_return, T_obj> sigc::mem_fun(T_obj&, T_return (T_obj2::*)()) [with T_return = void, T_obj = project::gui::Config, T_obj2 = project::gui::Config]’ 
src/gui/Config.cpp:72:95: instantiated from here 
/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1780:18: error: using invalid field ‘sigc::bound_mem_functor0<T_return, T_obj>::obj_’ 
/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h: In function ‘void sigc::visit_each(const T_action&, const sigc::bound_mem_functor2<T_return, T_obj, T_arg1, T_arg2>&) [with T_action = sigc::internal::limit_derived_target<sigc::trackable*, sigc::internal::slot_do_bind>, T_return = void, T_obj = project::gui::Config, T_arg1 = _GtkNotebookPage*, T_arg2 = unsigned int]’: 
/usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:267:3: instantiated from ‘void sigc::visit_each(const T_action&, const sigc::adaptor_functor<T_functor>&) [with T_action = sigc::internal::limit_derived_target<sigc::trackable*, sigc::internal::slot_do_bind>, T_functor = sigc::bound_mem_functor2<void, project::gui::Config, _GtkNotebookPage*, unsigned int>]’ 
/usr/include/sigc++-2.0/sigc++/visit_each.h:170:3: instantiated from ‘void sigc::visit_each_type(const T_action&, const T_functor&) [with T_type = sigc::trackable*, T_action = sigc::internal::slot_do_bind, T_functor = sigc::adaptor_functor<sigc::bound_mem_functor2<void, project::gui::Config, _GtkNotebookPage*, unsigned int> >]’ 
/usr/include/sigc++-2.0/sigc++/functors/slot.h:39:7: instantiated from ‘sigc::internal::typed_slot_rep<T_functor>::typed_slot_rep(const T_functor&) [with T_functor = sigc::bound_mem_functor2<void, project::gui::Config, _GtkNotebookPage*, unsigned int>]’ 
/usr/include/sigc++-2.0/sigc++/functors/slot.h:604:65: instantiated from ‘sigc::slot2<T_return, T_arg1, T_arg2>::slot2(const T_functor&) [with T_functor = sigc::bound_mem_functor2<void, project::gui::Config, _GtkNotebookPage*, unsigned int>, T_return = void, T_arg1 = _GtkNotebookPage*, T_arg2 = unsigned int]’ 
/usr/include/sigc++-2.0/sigc++/functors/slot.h:1184:26: instantiated from ‘sigc::slot<T_return, T_arg1, T_arg2, sigc::nil, sigc::nil, sigc::nil, sigc::nil, sigc::nil>::slot(const T_functor&) [with T_functor = sigc::bound_mem_functor2<void, project::gui::Config, _GtkNotebookPage*, unsigned int>, T_return = void, T_arg1 = _GtkNotebookPage*, T_arg2 = unsigned int]’ 
src/gui/Config.cpp:70:95: instantiated from here 
/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1936:3: error: ‘const class sigc::bound_mem_functor2<void, project::gui::Config, _GtkNotebookPage*, unsigned int>’ has no member named ‘obj_’ 
/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h: In member function ‘T_return sigc::bound_mem_functor2<T_return, T_obj, T_arg1, T_arg2>::operator()(typename sigc::type_trait<T_arg3>::take, typename sigc::type_trait<T_arg4>::take) const [with T_return = void, T_obj = project::gui::Config, T_arg1 = _GtkNotebookPage*, T_arg2 = unsigned int, typename sigc::type_trait<T_arg3>::take = _GtkNotebookPage* const&, typename sigc::type_trait<T_arg4>::take = const unsigned int&]’: 
/usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:103:39: instantiated from ‘typename sigc::adaptor_functor<T_functor>::deduce_result_type<T_arg1, T_arg2>::type sigc::adaptor_functor<T_functor>::operator()(T_arg1, T_arg2) const [with T_arg1 = _GtkNotebookPage* const&, T_arg2 = const unsigned int&, T_functor = sigc::bound_mem_functor2<void, project::gui::Config, _GtkNotebookPage*, unsigned int>, typename sigc::adaptor_functor<T_functor>::deduce_result_type<T_arg1, T_arg2>::type = void]’ 
/usr/include/sigc++-2.0/sigc++/functors/slot.h:173:25: instantiated from ‘static T_return sigc::internal::slot_call2<T_functor, T_return, T_arg1, T_arg2>::call_it(sigc::internal::slot_rep*, typename sigc::type_trait<T_arg3>::take, typename sigc::type_trait<T_arg4>::take) [with T_functor = sigc::bound_mem_functor2<void, project::gui::Config, _GtkNotebookPage*, unsigned int>, T_return = void, T_arg1 = _GtkNotebookPage*, T_arg2 = unsigned int, typename sigc::type_trait<T_arg3>::take = _GtkNotebookPage* const&, typename sigc::type_trait<T_arg4>::take = const unsigned int&]’ 
/usr/include/sigc++-2.0/sigc++/functors/slot.h:180:45: instantiated from ‘static void* (* sigc::internal::slot_call2<T_functor, T_return, T_arg1, T_arg2>::address())(void*) [with T_functor = sigc::bound_mem_functor2<void, project::gui::Config, _GtkNotebookPage*, unsigned int>, T_return = void, T_arg1 = _GtkNotebookPage*, T_arg2 = unsigned int, void* (*)(void*) = void* (*)(void*)]’ 
/usr/include/sigc++-2.0/sigc++/functors/slot.h:607:7: instantiated from ‘sigc::slot2<T_return, T_arg1, T_arg2>::slot2(const T_functor&) [with T_functor = sigc::bound_mem_functor2<void, project::gui::Config, _GtkNotebookPage*, unsigned int>, T_return = void, T_arg1 = _GtkNotebookPage*, T_arg2 = unsigned int]’ 
/usr/include/sigc++-2.0/sigc++/functors/slot.h:1184:26: instantiated from ‘sigc::slot<T_return, T_arg1, T_arg2, sigc::nil, sigc::nil, sigc::nil, sigc::nil, sigc::nil>::slot(const T_functor&) [with T_functor = sigc::bound_mem_functor2<void, project::gui::Config, _GtkNotebookPage*, unsigned int>, T_return = void, T_arg1 = _GtkNotebookPage*, T_arg2 = unsigned int]’ 
src/gui/Config.cpp:70:95: instantiated from here 
/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1917:61: error: using invalid field ‘sigc::bound_mem_functor2<T_return, T_obj, T_arg1, T_arg2>::obj_’ 
/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1917:61: error: return-statement with a value, in function returning 'void' 
/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h: In function ‘void sigc::visit_each(const T_action&, const sigc::bound_mem_functor0<T_return, T_obj>&) [with T_action = sigc::internal::limit_derived_target<sigc::trackable*, sigc::internal::slot_do_bind>, T_return = void, T_obj = project::gui::Config]’: 
/usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:267:3: instantiated from ‘void sigc::visit_each(const T_action&, const sigc::adaptor_functor<T_functor>&) [with T_action = sigc::internal::limit_derived_target<sigc::trackable*, sigc::internal::slot_do_bind>, T_functor = sigc::bound_mem_functor0<void, project::gui::Config>]’ 
/usr/include/sigc++-2.0/sigc++/visit_each.h:170:3: instantiated from ‘void sigc::visit_each_type(const T_action&, const T_functor&) [with T_type = sigc::trackable*, T_action = sigc::internal::slot_do_bind, T_functor = sigc::adaptor_functor<sigc::bound_mem_functor0<void, project::gui::Config> >]’ 
/usr/include/sigc++-2.0/sigc++/functors/slot.h:39:7: instantiated from ‘sigc::internal::typed_slot_rep<T_functor>::typed_slot_rep(const T_functor&) [with T_functor = sigc::bound_mem_functor0<void, project::gui::Config>]’ 
/usr/include/sigc++-2.0/sigc++/functors/slot.h:451:65: instantiated from ‘sigc::slot0<T_return>::slot0(const T_functor&) [with T_functor = sigc::bound_mem_functor0<void, project::gui::Config>, T_return = void]’ 
/usr/include/sigc++-2.0/sigc++/functors/slot.h:1130:26: instantiated from ‘sigc::slot<T_return, sigc::nil, sigc::nil, sigc::nil, sigc::nil, sigc::nil, sigc::nil, sigc::nil>::slot(const T_functor&) [with T_functor = sigc::bound_mem_functor0<void, project::gui::Config>, T_return = void]’ 
src/gui/Config.cpp:72:96: instantiated from here 
/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1806:3: error: ‘const class sigc::bound_mem_functor0<void, project::gui::Config>’ has no member named ‘obj_’ 
/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h: In member function ‘T_return sigc::bound_mem_functor0<T_return, T_obj>::operator()() const [with T_return = void, T_obj = project::gui::Config]’: 
/usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:251:21: instantiated from ‘sigc::adaptor_functor<T_functor>::result_type sigc::adaptor_functor<T_functor>::operator()() const [with T_functor = sigc::bound_mem_functor0<void, project::gui::Config>, sigc::adaptor_functor<T_functor>::result_type = void]’ 
/usr/include/sigc++-2.0/sigc++/functors/slot.h:103:36: instantiated from ‘static T_return sigc::internal::slot_call0<T_functor, T_return>::call_it(sigc::internal::slot_rep*) [with T_functor = sigc::bound_mem_functor0<void, project::gui::Config>, T_return = void]’ 
/usr/include/sigc++-2.0/sigc++/functors/slot.h:110:45: instantiated from ‘static void* (* sigc::internal::slot_call0<T_functor, T_return>::address())(void*) [with T_functor = sigc::bound_mem_functor0<void, project::gui::Config>, T_return = void, void* (*)(void*) = void* (*)(void*)]’ 
/usr/include/sigc++-2.0/sigc++/functors/slot.h:454:7: instantiated from ‘sigc::slot0<T_return>::slot0(const T_functor&) [with T_functor = sigc::bound_mem_functor0<void, project::gui::Config>, T_return = void]’ 
/usr/include/sigc++-2.0/sigc++/functors/slot.h:1130:26: instantiated from ‘sigc::slot<T_return, sigc::nil, sigc::nil, sigc::nil, sigc::nil, sigc::nil, sigc::nil, sigc::nil>::slot(const T_functor&) [with T_functor = sigc::bound_mem_functor0<void, project::gui::Config>, T_return = void]’ 
src/gui/Config.cpp:72:96: instantiated from here 
/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1787:49: error: using invalid field ‘sigc::bound_mem_functor0<T_return, T_obj>::obj_’ 
/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1787:49: error: return-statement with a value, in function returning 'void' 
/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h: In function ‘void sigc::visit_each(const T_action&, const sigc::bound_mem_functor2<T_return, T_obj, T_arg1, T_arg2>&) [with T_action = sigc::internal::limit_derived_target<sigc::trackable*, sigc::internal::slot_do_unbind>, T_return = void, T_obj = project::gui::Config, T_arg1 = _GtkNotebookPage*, T_arg2 = unsigned int]’: 
/usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:267:3: instantiated from ‘void sigc::visit_each(const T_action&, const sigc::adaptor_functor<T_functor>&) [with T_action = sigc::internal::limit_derived_target<sigc::trackable*, sigc::internal::slot_do_unbind>, T_functor = sigc::bound_mem_functor2<void, project::gui::Config, _GtkNotebookPage*, unsigned int>]’ 
/usr/include/sigc++-2.0/sigc++/visit_each.h:170:3: instantiated from ‘void sigc::visit_each_type(const T_action&, const T_functor&) [with T_type = sigc::trackable*, T_action = sigc::internal::slot_do_unbind, T_functor = sigc::adaptor_functor<sigc::bound_mem_functor2<void, project::gui::Config, _GtkNotebookPage*, unsigned int> >]’ 
/usr/include/sigc++-2.0/sigc++/functors/slot.h:60:7: instantiated from ‘static void* sigc::internal::typed_slot_rep<T_functor>::destroy(void*) [with T_functor = sigc::bound_mem_functor2<void, project::gui::Config, _GtkNotebookPage*, unsigned int>]’ 
/usr/include/sigc++-2.0/sigc++/functors/slot.h:38:52: instantiated from ‘sigc::internal::typed_slot_rep<T_functor>::typed_slot_rep(const T_functor&) [with T_functor = sigc::bound_mem_functor2<void, project::gui::Config, _GtkNotebookPage*, unsigned int>]’ 
/usr/include/sigc++-2.0/sigc++/functors/slot.h:604:65: instantiated from ‘sigc::slot2<T_return, T_arg1, T_arg2>::slot2(const T_functor&) [with T_functor = sigc::bound_mem_functor2<void, project::gui::Config, _GtkNotebookPage*, unsigned int>, T_return = void, T_arg1 = _GtkNotebookPage*, T_arg2 = unsigned int]’ 
/usr/include/sigc++-2.0/sigc++/functors/slot.h:1184:26: instantiated from ‘sigc::slot<T_return, T_arg1, T_arg2, sigc::nil, sigc::nil, sigc::nil, sigc::nil, sigc::nil>::slot(const T_functor&) [with T_functor = sigc::bound_mem_functor2<void, project::gui::Config, _GtkNotebookPage*, unsigned int>, T_return = void, T_arg1 = _GtkNotebookPage*, T_arg2 = unsigned int]’ 
src/gui/Config.cpp:70:95: instantiated from here 
/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1936:3: error: ‘const class sigc::bound_mem_functor2<void, project::gui::Config, _GtkNotebookPage*, unsigned int>’ has no member named ‘obj_’ 
/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h: In function ‘void sigc::visit_each(const T_action&, const sigc::bound_mem_functor0<T_return, T_obj>&) [with T_action = sigc::internal::limit_derived_target<sigc::trackable*, sigc::internal::slot_do_unbind>, T_return = void, T_obj = project::gui::Config]’: 
/usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:267:3: instantiated from ‘void sigc::visit_each(const T_action&, const sigc::adaptor_functor<T_functor>&) [with T_action = sigc::internal::limit_derived_target<sigc::trackable*, sigc::internal::slot_do_unbind>, T_functor = sigc::bound_mem_functor0<void, project::gui::Config>]’ 
/usr/include/sigc++-2.0/sigc++/visit_each.h:170:3: instantiated from ‘void sigc::visit_each_type(const T_action&, const T_functor&) [with T_type = sigc::trackable*, T_action = sigc::internal::slot_do_unbind, T_functor = sigc::adaptor_functor<sigc::bound_mem_functor0<void, project::gui::Config> >]’ 
/usr/include/sigc++-2.0/sigc++/functors/slot.h:60:7: instantiated from ‘static void* sigc::internal::typed_slot_rep<T_functor>::destroy(void*) [with T_functor = sigc::bound_mem_functor0<void, project::gui::Config>]’ 
/usr/include/sigc++-2.0/sigc++/functors/slot.h:38:52: instantiated from ‘sigc::internal::typed_slot_rep<T_functor>::typed_slot_rep(const T_functor&) [with T_functor = sigc::bound_mem_functor0<void, project::gui::Config>]’ 
/usr/include/sigc++-2.0/sigc++/functors/slot.h:451:65: instantiated from ‘sigc::slot0<T_return>::slot0(const T_functor&) [with T_functor = sigc::bound_mem_functor0<void, project::gui::Config>, T_return = void]’ 
/usr/include/sigc++-2.0/sigc++/functors/slot.h:1130:26: instantiated from ‘sigc::slot<T_return, sigc::nil, sigc::nil, sigc::nil, sigc::nil, sigc::nil, sigc::nil, sigc::nil>::slot(const T_functor&) [with T_functor = sigc::bound_mem_functor0<void, project::gui::Config>, T_return = void]’ 
src/gui/Config.cpp:72:96: instantiated from here 
/usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1806:3: error: ‘const class sigc::bound_mem_functor0<void, project::gui::Config>’ has no member named ‘obj_’ 
make: *** [src/gui/Config.o] Error 1 

我們不知道，如果問題確實是關係到圖書館sigC++或者如果它只是一個命名空間的問題。 當我們在單獨的文件中編譯沒有命名空間的文件時，它就起作用了。

任何想法表示讚賞，問候

Answer 1

你的類是私人從Gtk::Window

class gui::Config : Gtk::Window 

繼承VS

class gui::Config : public Gtk::Window 

它看起來像信號試圖連接到這些接口，但他們無法訪問。

Answer 2

您需要將所有三個名稱空間導入到提供定義的文件中。

using namespace project; 
using namespace gui; 
using namespace gtk; 

void Config::connect_signals() 
{ 
    // ... 
} 

但我看到project, gui名稱空間是多餘的。已經Config在命名空間project中。我不明白你的評論說gui命名空間是其他地方聲明。這就足夠了 -

namespace project 
{ 
    class Config : Gtk::Window // The class being inherited is from a different namespace 
    { 
     //...