What is the best way to serialize big complex structure in  C++ ?

May be Boost library?
The compiler isGreen Hills, microproccessor is Arm.
Where can I download Boost library and whether Boost  can be compiled with Green Hills for Arm.

May be some other ideas ?

The purpose is to write big C++ structure to byte array quickly (it is a real time system) and optimize the memory managment.

Thanks.