Cannot compile with Boost Libraries

[daguldagul]

Class Base
{  Base::get(); };
Class Child inherits Class Base
{};

In main()...

std::vector< boost::shared_ptr<Child> >::iterator iSessionIter;
std::vector< boost::shared_ptr<Child> > aoSessions;

....
aoSessions.push_back( boost::shared_ptr<Child>( new Child( name1, name2 ) ) );
....

for( iSessionIter = aoSessions.begin(); iSessionIter != aoSessions.end(); iSessionIter++ )
{
    ( (boost::shared_ptr<Base>)(*iSessionIter) )->get();
}

Error:
boost_1_34_0/boost/shared_ptr.hpp", line 194: Error: Cannot use Child * const to initialize Base*.

Please help how to fix this compilation error. Is this a boost library problem?
Thank you so much!

[daguldagul]

WITH CORRECTION:

Class A
{
public:
  get();
};

Class A_Wrapper
{
   A oA;
};

In main()...

std::vector< boost::shared_ptr<A_Wrapper> >::iterator iSessionIter;
std::vector< boost::shared_ptr<A_Wrapper> > aoSessions;

....
aoSessions.push_back( boost::shared_ptr<A_Wrapper>( new A_Wrapper( name1, name2 ) ) );
....

for( iSessionIter = aoSessions.begin(); iSessionIter != aoSessions.end(); iSessionIter++ )
{
( (boost::shared_ptr<A>)(*iSessionIter) )->get();
}

Error:
boost_1_34_0/boost/shared_ptr.hpp", line 194: Error: Cannot use A_Wrapper* const to initialize Base*.

Please help how to fix this compilation error. Is this a boost library problem?
Thank you so much!

[daguldagul]

WITH CORRECTION:

Class A 
{ 
public:
get(); 
}; 

Class A_Wrapper
{
A oA;
}; 

In main()... 

std::vector< boost::shared_ptr<A_Wrapper> >::iterator iSessionIter; 
std::vector< boost::shared_ptr<A_Wrapper> > aoSessions; 

.... 
aoSessions.push_back( boost::shared_ptr<A_Wrapper>( new A_Wrapper( name1, name2 ) ) ); 
.... 

for( iSessionIter = aoSessions.begin(); iSessionIter != aoSessions.end(); iSessionIter++ ) 
{ 
( (boost::shared_ptr<A>)(*iSessionIter) )->get(); 
} 

Error: 
boost_1_34_0/boost/shared_ptr.hpp", line 194: Error: Cannot use A_Wrapper* const to initialize A*. 

Please help how to fix this compilation error. Is this a boost library problem? 
Thank you so much!