Question

我在尝试编译模板化类时遇到链接器错误。我对C ++模板化编程和编译器的工作方式（MSBuild / VS2012）并不太热，并且很难确定我做错了什么。我正在使用/ CLR进行编译，当我尝试编译我的源文件时，我得到了一系列链接器错误（LNK2005），这些文件大致为：

ISaveStrategy.h：

#pragma once
#pragma unmanaged

template<class T>
class ISaveStrategy
{
public:
    enum SaveResult {OK, Error}; 

    virtual SaveResult Save(const T&  itemToSave) = 0;
};

SaveToXmlStrategy.h：

#pragma once

#include <gcroot.h>
#include "ISaveStrategy.h"

#pragma unmanaged

namespace System{namespace Xml{ref class XmlWriter;}}

template<class T>
class SaveToXmlStrategy : public ISaveStrategy<T>
{
public:

    SaveToXmlStrategy(gcroot<System::Xml::XmlWriter^> writer)
        : m_writer(writer)
    {}

    virtual SaveResult Save(const T& itemToSave);

private:
    gcroot<System::Xml::XmlWriter^> m_writer;
};

SaveToXmlStrategy.cpp：

#pragma once

#include "stdafx.h"
#include "SaveToXmlStrategy.h"
#include "IKeyFrame.h"
#include "IKeyFrameTransition.h"
#include "ICueProvider.h"

#pragma managed

using namespace System;
using namespace System::Text;

template class SaveToXmlStrategy<IKeyFrameTransition>;
SaveToXmlStrategy<IKeyFrameTransition>::SaveResult SaveToXmlStrategy<IKeyFrameTransition>::Save(const IKeyFrameTransition& keyFrame)
{
    return SaveResult::OK;
}


template class SaveToXmlStrategy<ICueProvider>;
SaveToXmlStrategy<ICueProvider>::SaveResult SaveToXmlStrategy<ICueProvider>::Save(const ICueProvider& keyFrame)
{
    return SaveResult::OK;
}


template class SaveToXmlStrategy<IKeyFrame>;
SaveToXmlStrategy<IKeyFrame>::SaveResult SaveToXmlStrategy<IKeyFrame>::Save(const IKeyFrame& keyFrame)
{
    SaveResult result = SaveResult::OK;
    return result;
}

Implementation.cpp：

#pragma once
#include "SaveToXmlStrategy.cpp"

//inside a function body :
ISaveStrategy<IKeyFrame>& keyFrameSaver = SaveToXmlStrategy<IKeyFrame>(xmlWriter.get());

Answer 1

GAAR！问题是在实现文件中我包含了SaveToXmlStrategy.cpp文件，而不是.h - 直到我在这里重新阅读我的问题，我才意识到这个问题正在盯着我！ / p>

模板化类的链接器错误

1 个答案: