Visual studio不会用* .inl实现编译模板类

问题描述

我正在关注一本关于SFML游戏开发的书，但我坚持在第二章，因为我无法编译我刚才写的代码。

它几乎是从书中逐字复制（除了成员变量名和异常文本）。我有C ++和模板的经验，但我从来没有看到这个错误，我一直盯着这个几个小时现在，我没有看到任何错误的代码。

这是我的* .h文件：

  #pragma once 
 #include< map& 
 #include< memory> 
 #include< string> 
 #include< stdexcept> 
 #include< cassert> 
 #includeenumFile.h
 
 template< typename Resource，typename标识符> 
 class ResourceHolder 
 {
 public：
 ResourceHolder（void）; 
〜ResourceHolder（void）; 
 
 void load（Identifier id，const std :: string& filename）; 
 
 template< typename参数> 
 void load（Identifier id，const std :: string& filename，
 const Parameter& secondParam）; 
 
资源& get（Identifier id）; 
 const Resource& get（Identifier id）const; 
 
 private：
 std :: map< Identifier，std :: unique_ptr< Resource> resourceMap; 
}; 
 
 #includeResourceHolder.inl
  

这里是my *。 inl file：

  template< typename Resource，typename Identifier> 
 void ResourceHolder< Resource，Identifier> :: load（Identifier id，const std :: string& filename）
 {
 //创建和加载资源
 std :: unique_ptr<资源> resource（new Resource（））; 
 if（！resource-> loadFromFile（filename））
 throw std :: runtime_error（加载资源失败+ filename）; 
 
 //如果加载成功，插入资源映射
 auto inserted = resourceMap.insert（std :: make_pair（id，std :: move（resource）））; 
 assert（inserted.second）; 
} 
 
 template< typename Resource，typename标识符> 
 template< typename参数> 
 void ResourceHolder< Resource，Identifier> :: load（Identifier id，const std :: string& filename，
 const Parameter& secondParam）
 {
 //创建并加载资源
 std :: unique_ptr< Resource> resource（new Resource（））; 
 if（！resource-> loadFromFile（filename，secondParam））
 throw std :: runtime_error（无法加载资源：+ filename）; 
 
 //如果加载成功，插入资源映射
 auto inserted = resourceMap.insert（std :: make_pair（id，std :: move（resource）））; 
 assert（inserted.second）; 
} 
 
 template< typename Resource，typename标识符> 
资源& ResourceHolder< Resource，Identifier> :: get（Identifier id）
 {
 auto found = resourceMap.find（id）; 
 assert（found！= resourceMap.end（））; 
 
 return * found-> second; 
} 
 
 template< typename Resource，typename标识符> 
 const Resource& ResourceHolder< Resource，Identifier> :: get（Identifier id）const 
 {
 auto found = resourceMap.find（id）; 
 assert（found！= resourceMap.end（））; 
 
 return * found-> second; 
} 
  

对不起，很多代码，但我绝望在这里。我得到不寻常的错误，所有在* .inl文件，而不是写它们，我拍了截图：

有什么想法如何解决这个问题？

编辑：

$ b b

 命名空间纹理
 {
枚举ID {Landscape，Airplane，Missile}; 
} 
  

当我想使用类时，我使用它如下： p>

  ResourceHolder< sf :: Texture，Textures :: ID>纹理
 textureHolder.load（Textures :: Airplane，path / to / texture.png）; 
  

解决方案

从项目中删除或排除ResourceHolder.inl文件在VS然后添加它再次解决了我的问题。我不知道为什么这个工作，但现在它编译好。

I'm following a book about SFML game development, but I'm stuck on the second chapter, because I can't compile the code I just wrote.

It's almost word-by-word copy from the book (except from member variable name and exception text). I have experience with C++ and templates, but I have never seen this error before and I've been staring at this for few hours now and I don't see anything wrong with this code.

Here is my *.h file:

#pragma once
#include <map>
#include <memory>
#include <string>
#include <stdexcept>
#include <cassert>
#include "enumFile.h"

template <typename Resource, typename Identifier>
class ResourceHolder
{
public:
    ResourceHolder(void);
    ~ResourceHolder(void);

    void load(Identifier id, const std::string & filename);

    template <typename Parameter>
    void load(Identifier id, const std::string & filename,
              const Parameter& secondParam);

    Resource & get(Identifier id);
    const Resource & get(Identifier id) const;

private:
    std::map<Identifier, std::unique_ptr<Resource>> resourceMap;
};

#include "ResourceHolder.inl"

and here is my *.inl file:

template <typename Resource, typename Identifier>
void ResourceHolder<Resource, Identifier>::load(Identifier id, const std::string& filename)
{
    // Create and load resource
    std::unique_ptr<Resource> resource(new Resource());
    if (!resource->loadFromFile(filename))
        throw std::runtime_error("Failed to load resource: " + filename);

    // If loading successful, insert resource to map
    auto inserted = resourceMap.insert(std::make_pair(id, std::move(resource)));
    assert(inserted.second);
}

template <typename Resource, typename Identifier>
template <typename Parameter>
void ResourceHolder<Resource, Identifier>::load(Identifier id, const std::string& filename,
                                                const Parameter& secondParam)
{
    // Create and load resource
    std::unique_ptr<Resource> resource(new Resource());
    if (!resource->loadFromFile(filename, secondParam))
        throw std::runtime_error("Failed to load resource: " + filename);

    // If loading successful, insert resource to map
    auto inserted = resourceMap.insert(std::make_pair(id, std::move(resource)));
    assert(inserted.second);
}

template <typename Resource, typename Identifier>
Resource& ResourceHolder<Resource, Identifier>::get(Identifier id)
{
    auto found = resourceMap.find(id);
    assert(found != resourceMap.end());

    return *found->second;
}

template <typename Resource, typename Identifier>
const Resource& ResourceHolder<Resource, Identifier>::get(Identifier id) const
{
    auto found = resourceMap.find(id);
    assert(found != resourceMap.end());

    return *found->second;
}

Sorry for a lot of code, but I'm desperate here. I'm getting unusual errors, all in the *.inl file, instead of writing them, I took a screenshot:

Any idea how to fix this?

EDIT: a word on how the class is used.

I have and enum inside a texture namespace (that is what "enumFile.h" is)

namespace Textures
{
    enum ID {Landscape, Airplane, Missile};
}

When I want to use the class, I use it as follows:

ResourceHolder<sf::Texture, Textures::ID> textureHolder;
textureHolder.load(Textures::Airplane, "path/to/texture.png");

解决方案

Removing or excluding the ResourceHolder.inl file from the project in VS and then adding it again solved the problem for me. I have no idea as to why this worked, but now it compiles fine.

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