我正在使用指針向量來釋放堆中的一系列節點對象。該矢量具有所有節點對象地址,並且有一個函數delete_nodes,該函數與for_each循環一起用於刪除矢量中的所有節點。出於某種原因,我得到了Eclipse CDT的用的for_each循環以下錯誤紅色下劃線:for_each調用將無法使用指針向量
error: no matching function for call to 'for_each(__gnu_cxx::__normal_iterator<Node**, std::vector<Node*, std::allocator<Node*> > >, __gnu_cxx::__normal_iterator<Node**, std::vector<Node*, std::allocator<Node*> > >, <unresolved overloaded function type>)'
代碼爲霍夫曼編碼和循環的for_each是在最後。 nodes_delete向量是在while循環之前創建的。
void Huff::delete_nodes(Node*n){//this is used to delete all the nodes in the binary tree at the end of Huff::compress()
delete n;
}
vector<Code>* Huff::compress(){
//-------GETTING WEIGHTS/FREQUENCIES------
vector<Node *>* nodes = new vector<Node*>; // Vector of nodes for later use
map<char, int>* freq = new map<char, int>; // Map to find weight of nodes
for(unsigned int i = 0; i < content.length(); i++)
(*freq)[content[i]]++;
CopyTo copyto(nodes); //sets vector<Node*> to copy to
for_each(freq->begin(), freq->end(), copyto); // Copies
delete freq;
vector<Node *>::iterator beg = nodes->begin();
//-------SETTING UP TO BUILD TREE------
if(nodes->size() % 2 == 1){ //makes sure there are an even number of nodes
Node* fill = new Node;
fill->set_node(0, '*', NULL, NULL);
nodes->push_back(fill);
}
huff_sort(nodes); // sort nodes by weight
vector<Node*> nodes_delete(*nodes); //this is used to delete all the nodes in the binary tree at the end
//-------BUILDING TREE------
while(nodes->size() != 1){ //Sorts nodes by weight and then removes two of them and replaces them with one
int w= (**beg).weight + (**(beg+1)).weight;
Node* p = new Node;
p->set_node(w, '*', *nodes->begin(), *(nodes->begin()+1)); //making it the parent node of the two lowest nodes
nodes->erase(nodes->begin(), nodes->begin()+2);
unsigned int i = 0;
while(w > (*nodes)[i]->weight && i <= nodes->size()){ //finds where to insert the parent node based on weight
i++;
}
if(i > nodes->size()) //if it needs to be inserted at the end
nodes->push_back(p);
else
nodes->insert(nodes->begin()+i, p);
}
//-------TRAVERSING TREE------
Node* root = (*nodes)[0];
delete nodes;
vector<Code>* codes = new vector<Code>;
traverse(root, codes , "");
delete root;
for_each(nodes_delete.begin(), nodes_delete.end(), delete_nodes);
return codes;
}
「delete_nodes」函數是否有多個(重載)定義?在上面的代碼中,我只能看到一個,但是您是否檢查過是否存在另一個,也許在一個頭文件中? – jogojapan 2012-07-25 01:58:48
@jogojapan就我所知,沒有其他的delete_nodes。另外,如果我將delete_nodes的名稱更改爲其他任何名稱,則錯誤仍然存在。 – 2012-07-25 02:02:00
順便說一句我假設'delete_nodes'函數被定義爲一個靜態成員函數。這實際上是正確的嗎?如果不是的話,下面的Matteo Italia是正確的(儘管我發現編譯器的錯誤消息在這種情況下會引起誤導)。 – jogojapan 2012-07-25 02:02:44