Writing a data structure to a file

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C++

I am new to this topic. My understanding about this came from this thread :
Creating a custom data structure associated with a file extension in C++[^]

Resolved my confusion about file extension vs data structure inside the file. To some extend unrelated.

What I want to do is, Create a container for a lot of files, so that they are loaded/unloaded into the memory dynamically based on the load.

For now, I am at the stage where I can create a data structure, then have to embed inside a container. I am a novice in this topic. A small example or perhaps an algorithm will help me get started.

Any help appreciated !

What I have tried:

Going through articles :
http://www.cplusplus.com/doc/tutorial/files/
http://www.ocoudert.com/blog/2011/07/09/a-practical-guide-to-c-serialization/