Question

我已经写了一个基本的资源持有人来保存GUI元素，起初它全部在MGUI.h和.cpp文件中，但是我后来才打算在具有孩子的某些GUI元素（例如Windows）中重用该持有人。，标签，容器等）。当所有内容都在MGUI.h和.cpp中时，代码将进行编译，并且尽管我有一些骇人听闻的方法（即我在AddElements中进行的不安全调用）也可以运行。

拆分代码后，我现在出现3个LINK2019错误

1>MGUI.obj : error LNK2019: unresolved external symbol "public: __thiscall MapleStory::MGUI::MElementManager<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class MapleStory::MGUI::MElement *>::MElementManager<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class MapleStory::MGUI::MElement *>(void)" (??0?$MElementManager@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@PAVMElement@MGUI@MapleStory@@@MGUI@MapleStory@@QAE@XZ) referenced in function "void __cdecl `dynamic initializer for 'private: static class MapleStory::MGUI::MElementManager<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class MapleStory::MGUI::MElement *> MapleStory::MGUI::MGUI::elements''(void)" (??__E?elements@MGUI@1MapleStory@@0V?$MElementManager@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@PAVMElement@MGUI@MapleStory@@@12@A@@YAXXZ)
1>MGUI.obj : error LNK2019: unresolved external symbol "public: __thiscall MapleStory::MGUI::MElementManager<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class MapleStory::MGUI::MElement *>::~MElementManager<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class MapleStory::MGUI::MElement *>(void)" (??1?$MElementManager@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@PAVMElement@MGUI@MapleStory@@@MGUI@MapleStory@@QAE@XZ) referenced in function "void __cdecl `dynamic atexit destructor for 'private: static class MapleStory::MGUI::MElementManager<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class MapleStory::MGUI::MElement *> MapleStory::MGUI::MGUI::elements''(void)" (??__F?elements@MGUI@1MapleStory@@0V?$MElementManager@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@PAVMElement@MGUI@MapleStory@@@12@A@@YAXXZ)
1>MGUI.obj : error LNK2019: unresolved external symbol "public: class MapleStory::MGUI::MElement * & __thiscall MapleStory::MGUI::MElementManager<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class MapleStory::MGUI::MElement *>::AddElement(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class MapleStory::MGUI::MElement *)" (?AddElement@?$MElementManager@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@PAVMElement@MGUI@MapleStory@@@MGUI@MapleStory@@QAEAAPAVMElement@23@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@PAV423@@Z) referenced in function "public: static void __cdecl MapleStory::MGUI::MGUI::CreateUIElements(void)" (?CreateUIElements@MGUI@1MapleStory@@SAXXZ)

我已经检查了include顺序，以确保一切正常，但找不到导致它的原因，还确保了当我编译global.cpp时显示的第一行是global.cpp是项目的一部分上。

无论如何我都不是专业人士，并且可能错过了一些明显的东西，这也是我在这里的第一篇文章，如果我以不好的方式构造它，可以随时询问任何丢失的信息。

MGUI.h-包含所有GUI元素的类-基本上是GUI的根

//MGUI.h
#pragma once
#include "global.h"
#include "MElement.h"

namespace MapleStory
{
    namespace MGUI
    {
        class MGUI
        {
            ...
        private:
            static MElementManager<std::string, MElement*> elements;
        };


    }
}

MGUI.cpp

//MGUI.cpp
#include "MGUI.h"

using namespace MapleStory::MGUI;

MElementManager<std::string, MElement*> MGUI::elements;

void MGUI::CreateUIElements()
{
    MGUI::elements.AddElement("", (MElement*)0);
    //reinterpret_cast<MCheckBox&>(*MGUI::elements.AddElement("MCheckBox1", new MCheckBox())).BindEvent_CheckedChanged(Callback);
}

Global.h-大多数文件中需要的一些有用的类，结构，帮助程序和包含

//global.h
#pragma once

#include <SFML/Graphics.hpp>
#include <Thor/Resources.hpp>
#include <Thor/Graphics.hpp>

#include <Windows.h>
#include <string>

namespace MapleStory
{
    namespace MGUI
    {
        ...

        template <typename keyType, typename eleType>
        class MElementManager
        {
        public:
            MElementManager();
            ~MElementManager();

            typedef typename std::map<keyType, eleType>::iterator iterator;
            typedef typename std::map<keyType, eleType>::const_iterator const_iterator;

            inline iterator begin() noexcept { return elements.begin(); }
            inline const_iterator cbegin() const noexcept { return elements.cbegin(); }
            inline iterator end() noexcept { return elements.end(); }
            inline const_iterator cend() const noexcept { return elements.cend(); }

            eleType& AddElement(keyType key, eleType element);

            eleType& operator[] (keyType key)
            {
                return elements[key];
            }

        private:
            std::map<keyType, eleType> elements;
        };
    }
}

Global.cpp

//global.cpp
#include "global.h"

#include "MElement.h"

using namespace MapleStory::MGUI;

template <typename keyType, typename eleType>
MElementManager<keyType, eleType>::MElementManager()
{

}

template <typename keyType, typename eleType>
MElementManager<keyType, eleType>::~MElementManager()
{
    for (auto element : elements)
    {
        if (element.second)
        {
            delete element.second;
            element.second = 0;
        }
    }
}

template <typename keyType, typename eleType>
eleType& MElementManager<keyType, eleType>::AddElement(keyType key, eleType element)
{
    elements.insert(std::pair<keyType, eleType>(key, element));
    ((MElement*)element)->SetName(key);
    return this->elements[key];
}

LINK2019未解析的外部符号

0 个答案: