Clang VS VC++:“error: declaration of 'T' shadows template parameter”

Question

I was trying to compile the following code for the classic copy&swap idiom on my Mac with clang 3.3

template class node{

private:
             


        

Answer 1

I believe that this is what you want (which happens to be what you just added to your question as the third option)

#include 

template  class node;
template  void swap(node & a, node & b);

template class node {
    private:
        node* left;
        node* right;
        T value;

    public:
        friend void swap<>(node&, node&);
};

template  void swap(node & a, node & b) {
    std::swap(a.left, b.left);
    std::swap(a.right, b.right);
    std::swap(a.value, b.value);
}

int main() {
    node x, y;
    swap(x, y);
}