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lride

Template class syntax error

2 posts in this topic

I have some trouble writing Resource class and ResourceManager template class

ResourceManager.h
[source lang="cpp"]#pragma once
#include <unordered_map>
#include <utility> //for std::pair
#include "Resource.h"
#include <string>

template<class T> class ResourceManager{friend class Resource<T>;};

template<>
class ResourceManager<sf::Music>
{
private:
std::unordered_map<std::string, std::pair<int, sf::Music>> resourceMap;
public:
};[/source]

Resource.h
[source lang="cpp"]#pragma once
#include <SFML\Audio.hpp>
#include "ResourceManager.h"
template<class T> class Resource;


template<>
class Resource<sf::Music>
{
private:
static ResourceManager<sf::Music> manager;//Cause of error
};[/source]

Errors I get;
error C2143: syntax error : missing ';' before '<'
error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
error C2238: unexpected token(s) preceding ';'
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I fixed the error and now must define a constructor

ResourceManager.h
[source lang="cpp"]#pragma once
#include <unordered_map>
#include <utility> //for std::pair
#include <SFML/Audio.hpp>
#include <string>

template<class T> class Resource;

template<class T> class ResourceManager{friend class Resource<T>;};

template<>
class ResourceManager<sf::Music>
{
private:
std::unordered_map<std::string, std::pair<int, sf::Music>> resourceMap;
public:
ResourceManager();
};

ResourceManager<sf::Music>::ResourceManager()
{
}[/source]

Resource.h
[source lang="cpp"]#pragma once
#include <SFML\Audio.hpp>
#include "ResourceManager.h"


template<>
class Resource<sf::Music>
{
private:
static ResourceManager<sf::Music> manager;
};
[/source]

When I compile this, I get linker error
1>HomeMenuScene.obj : error LNK2005: "public: __thiscall ResourceManager<class sf::Music>::ResourceManager<class sf::Music>(void)" (??0?$ResourceManager@VMusic@sf@@@@QAE@XZ) already defined in LogicManager.obj
1>main.obj : error LNK2005: "public: __thiscall ResourceManager<class sf::Music>::ResourceManager<class sf::Music>(void)" (??0?$ResourceManager@VMusic@sf@@@@QAE@XZ) already defined in LogicManager.obj
1>PlayingScene.obj : error LNK2005: "public: __thiscall ResourceManager<class sf::Music>::ResourceManager<class sf::Music>(void)" (??0?$ResourceManager@VMusic@sf@@@@QAE@XZ) already defined in LogicManager.obj
1>SettingMenuScene.obj : error LNK2005: "public: __thiscall ResourceManager<class sf::Music>::ResourceManager<class sf::Music>(void)" (??0?$ResourceManager@VMusic@sf@@@@QAE@XZ) already defined in LogicManager.obj
1>C:\Users\Park\Documents\Visual Studio 2012\Projects\Game3\Debug\Game3.exe : fatal error LNK1169: one or more multiply defined symbols found Edited by lride
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Put the constructor to .cpp or inline it.

ResourceManager<sf::Music>::ResourceManager()
{
}

It should be in .cpp file as you specialized the template, or just add inline before the declaration.
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