我在网格的默认构造函数的前两行收到编译器错误“错误：wall不是Grid的成员”。我不确定为什么要在我的头文件中同时定义墙和网格的原因！我也尝试过使用this-> wall，Grid :: wall和初始化列表。这是代码：
Grid::Grid() {
this->wall = Species("wall");
this->empty = Species("empty");
Grid::turn_number = 0;
int a,b;
for(a= 0; a < 100; a++)
for(b = 0; b< 100; b++) {
Creature empty_creature = Creature(Grid::empty,a,b,NORTH,this);
((Grid::map)[a][b]) = empty_creature;
}
Grid::width = 0;
Grid::height = 0;
}
当我更改默认构造函数以使用初始化列表时，会出现相同的错误：
Grid::Grid()
: width(0), height(0), turn_number(0), wall("wall"), empty("empty"){
int a,b;
for(a= 0; a < 100; a++)
for(b = 0; b< 100; b++) {
Creature empty_creature = Creature(Grid::empty,a,b,NORTH,this);
((Grid::map)[a][b]) = empty_creature;
}
}
在标题文件中：
class Grid {
protected:
Creature map[100][100];
int width,height;
int turn_number;
Species empty;
Species wall;
public:
Grid();
Grid(int _width, int _height);
void addCreature(Species &_species, int x, int y, Direction orientation);
void addWall(int x, int y);
void takeTurn();
void infect(int x, int y, Direction orientation, Species &_species);
void hop(int x, int y, Direction orientation);
bool ifWall(int x, int y, Direction orientation);
bool ifEnemy(int x, int y, Direction orientation, Species &_species);
bool ifEmpty(int x, int y, Direction orientation);
void print();
};
这是其余的编译器错误（在注释中要求）。对不起格式，我的计算机出于某种原因吐出了奇怪的字符。
Darwin.c++: In constructor ‘Grid::Grid()’:
Darwin.c++:8:40: error: class ‘Grid’ does not have any field named ‘wall’
Darwin.c++:8:54: error: class ‘Grid’ does not have any field named ‘empty’
Darwin.c++:12:39: error: ‘empty’ is not a member of ‘Grid’
Darwin.c++: In constructor ‘Grid::Grid(int, int)’:
Darwin.c++:17:86: error: class ‘Grid’ does not have any field named ‘wall’
Darwin.c++:17:99: error: class ‘Grid’ does not have any field named ‘empty’
Darwin.c++:21:39: error: ‘empty’ is not a member of ‘Grid’
Darwin.c++: In member function ‘void Grid::addWall(int, int)’:
Darwin.c++:32:31: error: ‘wall’ is not a member of ‘Grid’
Darwin.h:35:10: error: field ‘empty’ has incomplete type
Darwin.h:36:10: error: field ‘wall’ has incomplete type
In file included from RunDarwin.c++:33:0:
Darwin.h:35:10: error: field ‘empty’ has incomplete type
Darwin.h:36:10: error: field ‘wall’ has incomplete type
“类型不完整”表示您尚未为编译器提供的定义Species。没有定义，最多只能有一个指向数据的指针，因为编译器不知道要保留多少空间。因此，它给出一个错误，然后忽略该行，并尝试使程序的其余部分有意义。当然，由于忽略了该行，因此以后尝试使用它将会失败。
请注意，您的编辑器已按文件名对错误进行了排序，而不是向您显示错误的实际发生顺序。将来，请按顺序查看编译器输出。
通过将定义（或#include）放在Speciesbefore可以轻松解决所有问题class Grid。
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