save.cxx File Reference

Example of saving a new HDTree into a file. More...

#include <random>
#include "hdtree/Tree.h"
#include "examples.h"

Include dependency graph for save.cxx:

Functions
int	main (int argc, char **argv)

Detailed Description

Example of saving a new HDTree into a file.

Function Documentation

main()

int main	(	int	argc,
		char **	argv
	)

parse command line for arguments

Create a tree by defining what file it is in and where it resides within that file

Create branches to define what type of information will go into the HDTree. The hdtree::Tree::branch function returns a handle to the created hdtree::Branch object. This object can (and should) be used to interace with the values that will be stored in the HDTree on disk in order to reduce the number of in-memory copies that need to happen. Here, we use auto& to avoid typing out all the C++ template nonsense that hdtree::Branch does under-the-hood.

Each branch handle can be treated as a pointer to the underlying type.

Note: Branch handles are invalid after the tree they were created from is deleted.

Initialization of random number generation. Not really applicable to HDTree, just used here to show that varying length vectors can be serialized with ease

Actual update and filling of the HDTree.

You can see here how we can treat i_entry as if it was a properly initialized std::size_t * and rand_nums * as if it was a properly initialized std::vector<double> *.

We choose to save each value of the loop into the tree.

The final flushing of the data to disk as well as handle cleanup procedures will all be handled automatically by deconstruction.