Visual studio不会用* .inl实现编译模板类 [英] Visual studio won't compile template class with *.inl implementation
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）;
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");
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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