“类模板已经被声明为非类模板” [英] "class template has already been declared as a non-class template"

问题描述

当我离开命名空间的sf { 声明时，我得到这个奇怪的错误：

  1> c：\libraries和headers\sfml\sfml-1.6-sdk-windows-vc2008 \sfml-1.6\include \\ sfml \graphics\body.h（70）：错误C2989：'sf :: Body'：类模板已被声明为非类模板
 1> c：\libraries和headers \\ \\ sfml \sfml-1.6-sdk-windows-vc2008 \sfml-1.6 \include\sfml\graphics\body.h（11）：错误C3856：'sf'：类不是类模板
  

代码在过去3周不是模板类时工作得很好， :: Body类名;我最近改变它，使它更灵活。我可以不声明一个模板类在命名空间或什么？

代码如下：

  #include< SFML / Graphics.hpp> 
 #include< vector> 
 #include< math.h> 
 #include< cmath> 
 
命名空间sf {//当我把这个和最后括号的代码运行良好
 
 template< typename drawable> 
 class Body：public sf :: Drawable {
 
 private：
 sf :: Vector2f MoveVal; 
 std :: vector< drawable>可绘制; 
 
 public：
 body（const Vector2f& Position = Vector2f（0,0），const Vector2f& Scale = Vector2f（1,1），float Rotation = 0.f，const Color& Col = Color（255，255，255，255））{
 SetPosition（Position）; 
 SetScale（Scale）; 
 SetRotation（Rotation）; 
 SetColor（Col）;}; 
 
 //覆盖可绘制函数以检测任何移动
 void SetX（float X）{
 MoveVal.x + = X  -  GetPosition（）。 
 Drawable :: SetX（X）;}; 
 
 void SetY（float Y）{
 MoveVal.y + = Y  -  GetPosition（）。y; 
 Drawable :: SetY（Y）;}; 
 
 //常规函数
 void AddObject（drawable& Object）{
 Object.Move（GetX（），GetY（））; 
 Drawables.push_back（Object）;}; 
 
 void DestroyObject（unsigned short Index）{
 Drawables.erase（Drawables.begin（）+ Index）;}; 
 
 void Clear（）{
 Drawables.clear（）;}; 
 
 drawable& GetObject（unsigned short index）
 {return Drawables [index];}; 
 
 unsigned int GetNumbObjects（）
 {return Drawables.size（）;}; 
 
 void Draw（sf :: RenderTarget& target）{
 for（unsigned short I = 0; I< Drawables.size（）; I ++）{
 // Body offset 
 Drawables [I] .SetPosition（
 Drawables [I] .GetPosition（）。x + MoveVal.x，
 Drawables [I] .GetPosition（）。y + MoveVal.y）; 
} // TODO：根据整体颜色添加色调
 
 target.Draw（* this）; 
 
 //重置所有更改值
 MoveVal.x = 0; 
 MoveVal.y = 0; 
}; 
 
 void Render（sf :: RenderTarget& target）const {
 for（int I = 0; I  Drawables [I]。绘制（目标） 
}; 
}; // Body Class 
 
} //命名空间sf 
  

Graphics.hpp 不匹配 { code> } 或者你有一个向前声明 class Body p>

Hey i'm getting this odd error when I leave the namespace sf{ declaration in the later code:

1>c:\libraries and headers\sfml\sfml-1.6-sdk-windows-vc2008\sfml-1.6\include\sfml\graphics\body.h(70): error C2989: 'sf::Body' : class template has already been declared as a non-class template
1>c:\libraries and headers\sfml\sfml-1.6-sdk-windows-vc2008\sfml-1.6\include\sfml\graphics\body.h(11): error C3856: 'sf': class is not a class template

The code worked fine when it wasn't a template class for the past 3 weeks, With the same sf::Body class name; i just recently changed it to make it more flexible. Can i not declare a template class inside a namespace or what?

Here's the code:

#include <SFML/Graphics.hpp>
#include <vector>
#include <math.h>
#include <cmath>

namespace sf{ //when i take this out and the closing bracket the code runs fine

    template<typename drawable>     
class Body : public sf::Drawable{ 

    private:
        sf::Vector2f MoveVal;
        std::vector<drawable> Drawables;

    public:
        Body(const Vector2f& Position = Vector2f(0, 0), const Vector2f& Scale = Vector2f(1, 1), float Rotation = 0.f, const Color& Col = Color(255, 255, 255, 255)){
            SetPosition(Position);
            SetScale(Scale);
            SetRotation(Rotation);
            SetColor(Col);};

// Overide Drawable Functions To Detect any Movement
        void SetX(float X){
            MoveVal.x += X - GetPosition().x;
            Drawable::SetX(X);};

        void SetY(float Y){
            MoveVal.y += Y - GetPosition().y;
            Drawable::SetY(Y);};

// Regular Functions
        void AddObject(drawable& Object){
            Object.Move(GetX(),GetY());
            Drawables.push_back(Object);};

        void DestroyObject(unsigned short Index){
            Drawables.erase(Drawables.begin()+Index);};

        void Clear(){
            Drawables.clear();};

        drawable& GetObject(unsigned short index) 
            {return Drawables[index];};

        unsigned int GetNumbObjects() 
        {return Drawables.size();};

        void Draw(sf::RenderTarget& target){
            for(unsigned short I=0; I<Drawables.size(); I++){
                //Body offset
                Drawables[I].SetPosition( 
                    Drawables[I].GetPosition().x + MoveVal.x,
                    Drawables[I].GetPosition().y + MoveVal.y);
            }                                                   // TODO: add tint based on overall Body Color

            target.Draw(*this); 

            //Reset all the Change Values
            MoveVal.x=0;
            MoveVal.y=0;
        };

        void Render(sf::RenderTarget& target) const{
            for(int I=0; I< Drawables.size(); I++)
                Drawables[I].Draw(target);
        };
};// Body Class

} //namespace sf

解决方案

The two most likely candidates based on your information are that Graphics.hpp has mismatched { } or that you had a forward declaration of class Body without marking it a template.

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