静态库“未定义的引用”到对象构造函数

Question

I'm having this issue where I cannot call the object constructor in main.cpp even after it has been included in main.h. The error message is:

C:\Users\Espresso\Projects\AZRA\Debug/../src/main.cpp:7: undefined reference to `g_editor::LevelEditor::LevelEditor()'

Where main.cpp contains

#include "main.h"
g_editor::LevelEditor g_levelEditor;

and main.h contains:

#include "g_editor/g_editor.h"

g_editor.h contains all of the header files of the objects in the library, which includes the levelEditor. g_editor.h:

#ifndef G_EDITOR_H_
#define G_EDITOR_H_
#pragma once

#include "g_editor/Objects/editor_module.h"
#include "g_editor/Objects/utility_window.h"
#include "g_editor/Objects/prompt_window.h"
#include "g_editor/LevelEditor/LevelEditor.h"

extern g_editor::LevelEditor g_levelEditor;

#endif

And finally, LevelEditor.h contains the constructor and member functions of LevelEditor:

#ifndef G_LEVEL_EDITOR_H_
#define G_LEVEL_EDITOR_H_
#pragma once

#include "../Objects/editor_module.h"
#include "Modules/collisionGrid_module.h"
#include "Modules/HUD_module.h"
#include "Modules/IO_module.h"
#include "Modules/ledge_module.h"
#include "Modules/segment_module.h"
#include "g_level/g_level.h"

using namespace g_level;
namespace g_editor
{
    class LevelEditor
    {
        private:
            std::vector<editor_module*> modules;
            void loadModules();

        public:
            static LevelEditor& get()
            {
                static LevelEditor sSingleton;
                return sSingleton;
            }
            LevelEditor();
            ~LevelEditor() {};

I apologize for the wall of text, I've been staring at this for a few days now and I have tried reordering the static libraries by precedence (which eliminated all issues save for this one.) Is there a design flaw in my current setup? I am using sSingletons, global externs, and static libraries.

Answer 1

There is no definition of LevelEditor::LevelEditor .

You are either missing a source file, or you forgot to add {} .

Edit: or, if your constructor does not do anything anyway, just remove the declaration.

Answer 2

Either

1) This function is missing:

LevelEditor();  // So now what does this do????  That's what is missing.

or

2) it isn't missing, but you didn't add the source module or library where this function is located to your linker settings.