我可能在这里做一些愚蠢的事情,我想要一个指针(请原谅双关语)。
我定义了以下类:
ref class CoordinatePair {
public:
int x;
int y;
CoordinatePair();
CoordinatePair(int xInput, int yInput);
CoordinatePair(CoordinatePair ^Other);
//CoordinatePair& operator->();
};
相当简单。我发现我可以->
在类的命名空间中使用运算符选择成员,而不会产生不良影响。例如,以下编译:
CoordinatePair::CoordinatePair(CoordinatePair ^Other) {
x = Other->x;
y = Other->y;
}
时髦的。然而,当我尝试编译它时,我遇到了问题。
CoordinatePair^ Coordinates::TranslateCoords(CoordinatePair^ WorldCoords) {
CoordinatePair^ newCoords = gcnew CoordinatePair();
float coordsRatio = 0.0;
//Translate X
coordsRatio = (float) WorldCoords->x / WorldBounds->x;
newCoords->x = (int) (coordsRatio * PixelBounds->x);
//Translate Y
coordsRatio = 0.0;
coordsRatio = (float) WorldCoords->y / WorldBounds->y;
newCoords->y = (int) (coordsRatio * PixelBounds->y);
return newCoords;
}
(注意,在上面的代码中,WorldBounds
是Coordinates
类的成员。它本身就是CoordinatePair
为我的项目定义平面的。)
具体来说,我收到此错误:
.\Coordinates.cpp(95) : error C2819: type 'CoordinatePair' does not have an overloaded member 'operator ->'
嗯。哦,那好吧。我试图研究这个问题促使我尝试超载操作员。因此,我在类声明中添加了以下内容:
CoordinatePair^ operator->();
我这样定义它:
CoordinatePair^ CoordinatePair::operator->() {
return this;
}
这让编译器更加愤怒!:-(
.\Coordinates.cpp(17) : error C2818: application of overloaded 'operator ->' is recursive through type 'CoordinatePair'
y:\documents\wende-project\c3\wende_c3_executioncode\wende_c3_executioncode\c3_display\c3_app\Coordinates.h(7) : see declaration of 'CoordinatePair'
.\Coordinates.cpp(17) : warning C4280: 'operator ->' was self recursive through type 'CoordinatePair'
y:\documents\wende-project\c3\wende_c3_executioncode\wende_c3_executioncode\c3_display\c3_app\Coordinates.h(7) : see declaration of 'CoordinatePair'
.\Coordinates.cpp(18) : error C2818: application of overloaded 'operator ->' is recursive through type 'CoordinatePair'
y:\documents\wende-project\c3\wende_c3_executioncode\wende_c3_executioncode\c3_display\c3_app\Coordinates.h(7) : see declaration of 'CoordinatePair'
.\Coordinates.cpp(18) : warning C4280: 'operator ->' was self recursive through type 'CoordinatePair'
y:\documents\wende-project\c3\wende_c3_executioncode\wende_c3_executioncode\c3_display\c3_app\Coordinates.h(7) : see declaration of 'CoordinatePair'
.\Coordinates.cpp(62) : error C2818: application of overloaded 'operator ->' is recursive through type 'CoordinatePair'
y:\documents\wende-project\c3\wende_c3_executioncode\wende_c3_executioncode\c3_display\c3_app\Coordinates.h(7) : see declaration of 'CoordinatePair'
.\Coordinates.cpp(62) : warning C4280: 'operator ->' was self recursive through type 'CoordinatePair'
y:\documents\wende-project\c3\wende_c3_executioncode\wende_c3_executioncode\c3_display\c3_app\Coordinates.h(7) : see declaration of 'CoordinatePair'
.\Coordinates.cpp(62) : error C2818: application of overloaded 'operator ->' is recursive through type 'CoordinatePair'
y:\documents\wende-project\c3\wende_c3_executioncode\wende_c3_executioncode\c3_display\c3_app\Coordinates.h(7) : see declaration of 'CoordinatePair'
.\Coordinates.cpp(62) : warning C4280: 'operator ->' was self recursive through type 'CoordinatePair'
y:\documents\wende-project\c3\wende_c3_executioncode\wende_c3_executioncode\c3_display\c3_app\Coordinates.h(7) : see declaration of 'CoordinatePair'
.\Coordinates.cpp(62) : error C2818: application of overloaded 'operator ->' is recursive through type 'CoordinatePair'
y:\documents\wende-project\c3\wende_c3_executioncode\wende_c3_executioncode\c3_display\c3_app\Coordinates.h(7) : see declaration of 'CoordinatePair'
.\Coordinates.cpp(62) : warning C4280: 'operator ->' was self recursive through type 'CoordinatePair'
y:\documents\wende-project\c3\wende_c3_executioncode\wende_c3_executioncode\c3_display\c3_app\Coordinates.h(7) : see declaration of 'CoordinatePair'
.\Coordinates.cpp(62) : error C2818: application of overloaded 'operator ->' is recursive through type 'CoordinatePair'
y:\documents\wende-project\c3\wende_c3_executioncode\wende_c3_executioncode\c3_display\c3_app\Coordinates.h(7) : see declaration of 'CoordinatePair'
.\Coordinates.cpp(62) : warning C4280: 'operator ->' was self recursive through type 'CoordinatePair'
y:\documents\wende-project\c3\wende_c3_executioncode\wende_c3_executioncode\c3_display\c3_app\Coordinates.h(7) : see declaration of 'CoordinatePair'
.\Coordinates.cpp(95) : error C2818: application of overloaded 'operator ->' is recursive through type 'CoordinatePair'
y:\documents\wende-project\c3\wende_c3_executioncode\wende_c3_executioncode\c3_display\c3_app\Coordinates.h(7) : see declaration of 'CoordinatePair'
.\Coordinates.cpp(95) : warning C4280: 'operator ->' was self recursive through type 'CoordinatePair'
y:\documents\wende-project\c3\wende_c3_executioncode\wende_c3_executioncode\c3_display\c3_app\Coordinates.h(7) : see declaration of 'CoordinatePair'
.\Coordinates.cpp(95) : error C2818: application of overloaded 'operator ->' is recursive through type 'CoordinatePair'
y:\documents\wende-project\c3\wende_c3_executioncode\wende_c3_executioncode\c3_display\c3_app\Coordinates.h(7) : see declaration of 'CoordinatePair'
.\Coordinates.cpp(95) : warning C4280: 'operator ->' was self recursive through type 'CoordinatePair'
y:\documents\wende-project\c3\wende_c3_executioncode\wende_c3_executioncode\c3_display\c3_app\Coordinates.h(7) : see declaration of 'CoordinatePair'
查找错误给了我以下定义:
重载 'operator ->' 的应用是通过类型 'type' 递归的
类成员访问运算符的重新定义包含递归返回语句。要使用递归重新定义 -> 运算符,您必须将递归例程移动到从运算符覆盖函数调用的单独函数中。
我显然不知道我在这里做什么,需要朝着正确的方向前进。帮助?