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关于Node构造函数的默认参数问题 #19

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@AgathaZhang

AStar::Node::Node(Vec3i coordinates_, Node *parent_) {
parent = parent_;
coordinates = coordinates_;
G = H = 0;
}
这个构造函数的第二个参数没有默认参数,是否应该添加上去呢?如下:
AStar::Node::Node(Vec3i coordinates_, Node *parent_ = nullptr) {
parent = parent_;
coordinates = coordinates_;
G = H = 0;
}

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