Re: "moveable data type" in comparison with "r-value reference"
Just to correct a couple of typos that crept in. (I copied an old
version of the simple 'string' class into the post.)
Richard Smith wrote:
class string {
public:
string( char const* s = NULL )
: sz( s ? strlen(s) : 0u ), str( s ? new char[sz+1] : NULL )
{ if (s) strncpy( str, o.str, sz+1 ); }
^^^^^
"o.str" should read "s"
void swap( string const& o )
And this should take a non-const string:
void swap( string& o );
string& operator=( string&& o )
{ string(o).swap(*this); return *this; }
And this needs another invocation of move:
{ string(std::move(o)).swap(*this); return *this; }
namespace std {
template <typename T>
typename tr1::remove_reference<T>::type&& move(T&& t) {
return t;
}
}
(Where remove_reference is the TR1 metafunction declared in <type_traits>.)
If you try using ConceptGCC alpha 6, you'll find it doesn't yet have
std::move in <utility>, but the above implementation will work just fine.
--
Richard Smith
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