Fast-DDS-Gen: Increase performance through initializer lists in constructor templates.

[gDorndorf]

Proposal:

• Change the move constructor template in TypesSource.stg to provide an initializer list which uses the move constructors of the members.
• The same thing may be done to the copy constructor template .

Contribution:

gDorndorf/Fast-DDS-Gen@7cdadcc
Currently i only adapted the move constructor template as my understanding of copy_move() (TypesSource.stg) is limited.

Reason:

When enableing TypeObject generation via the -typeobject option, the standard constructor of every Type calls the registerTYPENAMETypes() function. When a Type contains other Types as members, using the move constructor also results in their base constructors beeing used, as no initializer list is provided. The subsequent calls to the register... function slow down the move operation significantly.

To my understanding this also affects the copy constructor.

Example code generated by current template:
SmallExample.cxx

...
SmallExample::SmallExample(
        SmallExample&& x)
{
    m_id = x.m_id;
    m_other_type = std::move(x.m_other_type);
}
...

SmallExample.h

...
private:

    uint8_t m_id;
    SomeType m_other_type;
};
... 

Example code generated with updated template:
SmallExample.cxx

...
SmallExample::SmallExample(
        SmallExample&& x): 
    m_id(std::move(x.m_id)),
    m_other_type(std::move(x.m_other_type))
{
    
}
...

SmallExample.h remains unchanged.

SmallExample.idl.gz
SomeType.idl.gz

Thank you for your time and development of the Fast-DDS libraries.