Boost::any and boost::lambda with std::find_if

[Misiu]

Hello everybody,

How to avoid using struct IsDataType for comparison for find_if
algorithm but use something like that what is now commented out in the
code below?

Regards,
Misiu

template<typename T>
struct IsDataType
{
bool operator() (const boost::any& operand)
{
return (operand.type() ==
typeid(boost::shared_ptr<DataDistributor<T> >));
}
};

template<typename T>
static DataDistributor<T>* GetDataDistributor()
{
std::list<boost::any>::iterator iter =
std::find_if(m_distrubutors.begin(), m_distrubutors.end(),
IsDataType<T>());

//error C2248: 'type_info::type_info' : cannot access private member
//declared in class 'type_info' boost\tuple\detail\tuple_basic.hpp 477

// std::find_if(m_distrubutors.begin(), m_distrubutors.end(),
// boost::lambda::bind(&boost::any::type, _1) ==
// typeid(boost::shared_ptr<DataDistributor<T> >));
....
}

 

[Mathias Gaunard]

Hello everybody,

How to avoid using struct IsDataType for comparison for find_if
algorithm but use something like that what is now commented out in the
code below?

You should ask on the boost mailing list.

 

[Sylvester Hesp]

Hello everybody,

How to avoid using struct IsDataType for comparison for find_if algorithm
but use something like that what is now commented out in the code below?

Regards,
Misiu

template<typename T>
struct IsDataType
{
bool operator() (const boost::any& operand)
{
return (operand.type() ==
typeid(boost::shared_ptr<DataDistributor<T> >));
}
};

template<typename T>
static DataDistributor<T>* GetDataDistributor()
{
std::list<boost::any>::iterator iter =
std::find_if(m_distrubutors.begin(), m_distrubutors.end(),
IsDataType<T>());

//error C2248: 'type_info::type_info' : cannot access private member
//declared in class 'type_info' boost\tuple\detail\tuple_basic.hpp 477
// std::find_if(m_distrubutors.begin(), m_distrubutors.end(),
// boost::lambda::bind(&boost::any::type, _1) ==
// typeid(boost::shared_ptr<DataDistributor<T> >));
...
}

You can't copy-construct a type_info structure. You'll need boost::ref.

- Sylvester

 

[Misiu]

You can't copy-construct a type_info structure. You'll need boost::ref.

Thanks a lot.
Misiu