CODEWITHSUNDEEP
c++compiler-errorsgtkmm
PBNeves
PBNeves

Reputation: 41

Why do I get the compile error, "make_managed" is not a member of 'Gtk'?

I'm trying to reproduce the example at - https://developer.gnome.org/gtkmm-tutorial/stable/sec-treeview-examples.html.en#treeview-dnd-example

Compile time error:

"make_managed" is not a member of 'Gtk' in the file treeview_withpopup.cc at the line auto item = Gtk::make_managed("_Edit", true);

The Netbeans IDE too shows an error at the same line

"Unable to resolve the identifier make_managed"

I've copied the code from the site and gtkmm.h is included in the header file.

I did not find any such question been asked on Stackoverflow yet! Why am I receiving this compile error?

Please help.

Upvotes: 4

Views: 1828

Answers (3)

Alexandr Gavriliuc
Alexandr Gavriliuc

Reputation: 522

Just to compile the example given on the following page:

https://developer.gnome.org/gtkmm-tutorial/stable/sec-range-example.html.en

I have added the following code fragment (thanks @GAVD) into the top of examplewindow.cc

namespace Gtk
{
  template<class T, class... T_Args>
  auto make_managed(T_Args&&... args) -> T*
  {
    return manage(new T(std::forward<T_Args>(args)...));
  }
}

and the example had been successfully compiled (no needs to modify standard files)

Upvotes: 0

GAVD
GAVD

Reputation: 2134

Gtk::make_managed is defined in gtkmm-3.0/gtkmm/object.h (see this link).

I already got the same error. Then I checked file object.h but there is no make_managed function. I don't know why. I just installed from rpm packge (I used the OS Fedora 23).

My solution:

I add code of make_managed in /usr/include/gtkmm-3.0/gtkmm/object:

template<class T, class... T_Args>
auto make_managed(T_Args&&... args) -> T* // Note: Edited to add return type here!
{
  return manage(new T(std::forward<T_Args>(args)...));
}

Upvotes: 5

cbcalvin
cbcalvin

Reputation: 25

The answer provided by @GAVD and edited by @Ayxan is correct.

Place the object.h file linked by the that answer in the directory with your source code.


Add an #include "object.h" before the other #include \<gtkmm-whatevers\>.
The make_managed function should resolve. Make sure that you remove this temporary fix when an updated version of gtkmm is fixes the problem permanently.

Or follow your local procedures to update /usr/include/gtkmm-3.0/gtkmm/object.h

I found that I also had to add the compiler flag -std=c++14 or -std=gnu++14 because of the way the make_managed function uses type auto. Adding the compiler flag changes the expected C++ language level from the default to the 2014 standard.

Upvotes: 1

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