Re: Constness with standard containters of pointers
James Kanze wrote:
On 16 mai, 19:29, Victor Bazarov <v.Abaza...@comAcast.net> wrote:
Javier wrote:
[..] if I have:
class A
{
public:
...
std::list< B * > & getList() { return m_list; };
const std::list< const B * > & getList() const
{ ...???... };
private:
std::list< B * > m_list;
}
What should I write in the const version of "getList()"?
You can't do much there. list<T> and list<const T> are
different types and cannot be converted into each other.
That's not quite true. There's nothing to stop you from writing
something like:
std::list< B const* > const A::getList() const
{
return std::list< B const* >( m_list.begin(), m_list.end() ) ;
}
The OP had the function returning a _reference_.
What about the conversion from "std::list< B * >" to "const
std::list< const B * >"... The second const changes the
template argument so, is it a different type?
Yep.
But the STL is designed so that you can convert any type of sequence
to
any other type, as long as the contained elements are
convertible. I use this rather regularly for initializations,
but it works generally.
I believe we use the term "convert" overloadedly here. Just as
much as one can "convert" an int into a C string...
V
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