C++, removing #include or #include in class header

Question

I want to remove, if possible, the includes of both and from my class header file. Both string and vector are return types of functions declare

Answer 1

Standard containers often have additional default template parameters (allocators, etc.) so this will not work. For example, here's a snippet from GNU implementation:

  template >
    class vector : protected _Vector_base<_Tp, _Alloc>
    { ... };