错误:“孩子"字段的类型“节点[2]"不完整 [英] error: field ‘children’ has incomplete type ‘Node [2]
问题描述
运行此代码时,出现错误:字段'children'具有不完整的类型'Node [0]'"".我正在用C ++编写代码,我想创建一个Node类,该类本身会创建另外两个Node对象,依此类推,直到到达maxDepth为止.我得到的完整错误:
When I run this code, i get the error: "Field 'children' has incomplete type 'Node[0]'". I'm coding in C++ and I want to create a Node class which creates in itself two other Node objects and so on, until it reaches the maxDepth. The full error I get:
18:24:16 **** Incremental Build of configuration Debug for project Tests ****
make all
Building file: ../main.cpp
Invoking: Cross G++ Compiler
g++ -std=c++0x -O3 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"main.d" -MT"main.d" -o "main.o" "../main.cpp"
../main.cpp:22:17: error: field ‘children’ has incomplete type ‘Node [2]’
Node children[2];
^
../main.cpp:8:7: note: definition of ‘class Node’ is not complete until the closing brace
class Node {
^
make: *** [main.o] Error 1
subdir.mk:18: recipe for target 'main.o' failed
和代码:
#include <iostream>
using namespace std;
class Node {
public:
int depth;
bool value;
Node(bool value, int depth, int maxDepth) {
this->value = value;
this->depth = depth;
if (this->depth < maxDepth) {
children[2] = {Node(false, this->depth + 1, maxDepth), Node(true, this->depth + 1, maxDepth)};
}
}
private:
Node children[2];
};
int main() {
Node tree(false, 0, 1);
return 0;
}
推荐答案
您已定义类Node
来包含Node
对象的数组:
You have defined class Node
to contain an array of Node
objects:
private:
Node children[2];
一个Node
不能包含另一个Node
,因为它的固定大小必须足以容纳其成员.它可以包含指向其他Node
对象的指针,在这种情况下,可能就是您应该使用的指针:
A Node
cannot contain another Node
, because it must have a fixed size that is large enough to contain its members. It can contain pointers to other Node
objects, and that's probably what you should use in this case:
private:
Node *children[2];
这意味着您必须将对children
数组的赋值重新编写(无论如何,它仍然是不正确的),以便它分配类型为Node *
的值:
This means that you must re-write your assignment to the children
array (which as it stands is incorrect anyway), so that it assigns values of type Node *
:
// Incorrect:
// children[2] = {Node(false, this->depth + 1, maxDepth), Node(true, this->depth + 1, maxDepth)};
children[0] = new Node(false, this->depth + 1, maxDepth);
children[1] = new Node(true, this->depth + 1, maxDepth);
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