我的代码；

template<typename T, int N>
class ngon{
  point<T> vertices[N];
  ...
  template<typename O> ngon<T,N>& operator=(const ngon<O,N> otyp);
    // O stands for other, as in other type
  ...
};

...
template<typename T, int N> typename<typename O>
ngon<T,N>& operator=(const ngon<O,N> otyp){
  for (int i = 0; i < N; i++)
    vertices[i] = point<T>(otyp.vertices[i]);
  return this;
}

.\Libraries/.\Geometry\Polygon_D2.hpp:103:11: error: too many template-parameter-lists
ngon<T,N>& operator=(const ngon<O,N> otyp){

最佳答案

采用

ngon<T,N> ngon<T,N>::operator=(const ngon<O,N> otyp){

ngon<T,N> operator=(const ngon<O,N> otyp){

https://stackoverflow.com/questions/31094812/