> template <typename T>

> void EntityUpdateBuffer<T>::push_back( const T& value )

> {

>       // how to acquire a write lock?

> 

>       m_buffer.push_back(value);

> }

> 

> template <typename T>

> const T& EntityUpdateBuffer<T>::at( int index ) const

> {

>       // how to acquire read lock?

>  

>       return m_buffer.at(index);

> }