好的,我以为我已经找到了模板类的实现文件,但显然没有......我在 VS 2013 C++ 解决方案中有以下文件:
主文件
#include "StateManager.h"
#include "State.h"
enum class Derp {
Herp,
Lerp,
Sherp,
};
int main() {
Game2D::State<Derp>::Context context(5);
Game2D::StateManager<Derp> mgr(context);
return 0;
}
状态管理器.h
#pragma once
#include "State.h"
namespace Game2D {
template<typename Id>
class StateManager {
private:
typename State<Id>::Context _context;
public:
explicit StateManager(typename State<Id>::Context context);
};
#include "StateManager.inl"
}
状态管理器.inl
template<typename Id>
StateManager<Id>::StateManager(typename State<Id>::Context context) :
_context(context)
{ }
状态.h
#pragma once
namespace Game2D {
template<typename Id>
class StateManager;
template<typename Id>
class State {
public:
struct Context {
Context(int);
int data;
};
private:
StateManager<Id>* _manager;
Context _context;
public:
State(StateManager<Id>&, Context);
virtual ~State();
};
#include "State.inl"
}
状态.inl
template<typename Id>
State<Id>::Context::Context(int data) {
this->data = data;
}
template<typename Id>
State<Id>::State(StateManager<Id>& manager, Context context) :
_manager(&manager),
_context(context)
{ }
template<typename Id>
State<Id>::~State() { }
构建此项目会产生以下错误:
错误 10 错误 C1903:无法从先前的错误中恢复;停止编译 state.inl 9 1
错误 9 错误 C2065:“上下文”:未声明的标识符 state.inl 8 1
错误 7 错误 C2065:“经理”:未声明的标识符 state.inl 7 1
错误 8 错误 C4430:缺少类型说明符 - 假定为 int。注意:C++ 不支持 default-int state.inl 7 1
错误 6 error C2039: 'State' : is not a member of '`global namespace'' state.inl 6 1
错误 1 错误 C2143:语法错误:缺少 ';' 在'<'之前 state.inl 2 1
错误 2 错误 C2988:无法识别的模板声明/定义 state.inl 2 1
错误 3 错误 C2059:语法错误:'<' state.inl 2 1
错误 4 错误 C3083: 'Context': '::' 左侧的符号必须是 state.inl 2 1 类型
错误 5 error C2039: 'Context' : is not a member of '`global namespace'' state.inl 2 1
任何有关如何修复这些错误的帮助将不胜感激!