C ++模板错误：没有匹配的函数调用 [英] C++ Templates Error: no matching function for call

问题描述

我得到这里提到的错误：
C ++ Templates错误：没有匹配的函数调用std :: vector< int，std :: allocator< int> >

I get the error mentioned here: C++ Templates Error: no matching function for call std::vector<int, std::allocator<int> >

以下是错误（再次）：

main.cpp: In function ‘int main()’:
main.cpp:21:21: error: no matching function for call to ‘Test<int>::foo(std::vector<int, std::allocator<int> >)’
main.cpp:21:21: note: candidate is:
main.cpp:14:6: note: void Test<T>::foo(std::vector<T>&) [with T = int]
main.cpp:14:6: note:   no known conversion for argument 1 from ‘std::vector<int, std::allocator<int> >’ to ‘std::vector<int, std::allocator<int> >&’

问题是我有一个更复杂的情况，我不知道如何解决它（不打破太多的代码）。
我有一个二叉树搜索树类是通用的。我想填充一个向量的T（通用）类型的元素与来自二叉搜索树节点的所有值 - 所以我不能使向量const。

The problem is that I have a more complex situation and I don't know how to solve it (without breaking too much code). I have a Binary Search Tree class that is generic. I want to populate a vector of elements of type T(generic) with all the values from the binary search tree nodes - so I can't make the vector const. The function that traverses the tree is recursive.

所以我有：

/*main*/

BST<int> t;

t.add(21);
t.add(12);
//.... etc.

vector<int> elements;

t.inorder(elements);
/* ------------ */

：

/*BST.h*/
template<typename T>
class BST{
    //....
    Node<T>* root;
    //....
    void inorder_rec(Node<T>* root, vector<T>& result);
    void inorder(vector<T>& result);
    //....
};

template<typename T>
void BST<T>::inorder_rec(Node<T>* root, vector<T>& result){
    // recursive call for the child nodes
}

void BST<T>::inorder(vector<T>& result){
    inorder_rec(this->root, result);
}
/* ------------ */

推荐答案

您正在尝试调用一个带有临时参考的函数。临时只能绑定到const的引用。此外，显示错误实际起源的地方是明智的。

You are trying to call a function that takes a reference with a temporary. A temporary can only bind to a reference to const. Also, it would be wise to show, where the error actually originated.

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