Ho i seguenti due segmenti di codice. Il primo blocco compila e funziona come previsto. Tuttavia il secondo blocco non viene compilato.Creazione di boost :: thread con un'istanza di std :: shared_ptr object
La mia domanda è, dato il codice qui sotto qual è la sintassi corretta quando si cerca di creare un thread in base a un'istanza di un oggetto che viene approssimata da una shared_ptr?
#include <iostream>
#include <new>
#include <memory>
#include <boost/thread.hpp>
struct foo
{
void boo() {}
};
int main()
{
//This works
{
foo* fptr = new foo;
boost::thread t(&foo::boo,fptr);
t.join();
delete fptr;
}
//This doesn't work
{
std::shared_ptr<foo> fptr(new foo);
boost::thread t(&foo::boo,fptr);
t.join();
}
return 0;
}
L'errore del compilatore:
Error 5 error C2784: 'T *boost::get_pointer(T *)' : could not deduce template argument for 'T *' from 'std::tr1::shared_ptr<_Ty>' c:\program files (x86)\boost\boost_1_47\boost\bind\mem_fn_template.hpp 40 1 htest
Error 3 error C2784: 'T *boost::get_pointer(const std::auto_ptr<_Ty> &)' : could not deduce template argument for 'const std::auto_ptr<_Ty> &' from 'std::tr1::shared_ptr<_Ty>' c:\program files (x86)\boost\boost_1_47\boost\bind\mem_fn_template.hpp 40 1 htest
Error 4 error C2784: 'T *boost::get_pointer(const std::auto_ptr<_Ty> &)' : could not deduce template argument for 'const std::auto_ptr<_Ty> &' from 'std::tr1::shared_ptr<_Ty>' c:\program files (x86)\boost\boost_1_47\boost\bind\mem_fn_template.hpp 40 1 htest
Error 8 error C2784: 'T *boost::get_pointer(const boost::shared_ptr<X> &)' : could not deduce template argument for 'const boost::shared_ptr<X> &' from 'std::tr1::shared_ptr<_Ty>' c:\program files (x86)\boost\boost_1_47\boost\bind\mem_fn_template.hpp 40 1 htest
Error 9 error C2784: 'T *boost::get_pointer(const boost::shared_ptr<X> &)' : could not deduce template argument for 'const boost::shared_ptr<X> &' from 'std::tr1::shared_ptr<_Ty>' c:\program files (x86)\boost\boost_1_47\boost\bind\mem_fn_template.hpp 40 1 htest
Error 1 error C2784: 'T *boost::get_pointer(const boost::scoped_ptr<T> &)' : could not deduce template argument for 'const boost::scoped_ptr<T> &' from 'std::tr1::shared_ptr<_Ty>' c:\program files (x86)\boost\boost_1_47\boost\bind\mem_fn_template.hpp 40 1 htest
Error 2 error C2784: 'T *boost::get_pointer(const boost::scoped_ptr<T> &)' : could not deduce template argument for 'const boost::scoped_ptr<T> &' from 'std::tr1::shared_ptr<_Ty>' c:\program files (x86)\boost\boost_1_47\boost\bind\mem_fn_template.hpp 40 1 htest
Error 6 error C2784: 'T *boost::get_pointer(const boost::reference_wrapper<T> &)' : could not deduce template argument for 'const boost::reference_wrapper<T> &' from 'std::tr1::shared_ptr<_Ty>' c:\program files (x86)\boost\boost_1_47\boost\bind\mem_fn_template.hpp 40 1 htest
Error 7 error C2784: 'T *boost::get_pointer(const boost::reference_wrapper<T> &)' : could not deduce template argument for 'const boost::reference_wrapper<T> &' from 'std::tr1::shared_ptr<_Ty>' c:\program files (x86)\boost\boost_1_47\boost\bind\mem_fn_template.hpp 40 1 htest
Error 10 error C2784: 'T *boost::get_pointer(const boost::intrusive_ptr<T> &)' : could not deduce template argument for 'const boost::intrusive_ptr<T> &' from 'std::tr1::shared_ptr<_Ty>' c:\program files (x86)\boost\boost_1_47\boost\bind\mem_fn_template.hpp 40 1 htest
Error 11 error C2784: 'T *boost::get_pointer(const boost::intrusive_ptr<T> &)' : could not deduce template argument for 'const boost::intrusive_ptr<T> &' from 'std::tr1::shared_ptr<_Ty>' c:\program files (x86)\boost\boost_1_47\boost\bind\mem_fn_template.hpp 40 1 htest
Eccellente che funziona bene! grazie. –