TO-DOs:

These are features that have been requested, and have been considered,

but are not yet implemented, because I'm undecided about how or whether they

should be implemented, and/or because they are difficult and/or time-consuming

to implement.

Also, some of these features tend to push libconfig toward becoming a

general-purpose structured-data storage mechanism, which is really not the

intended purpose of this library. I think something like sqlite is better

suited for that sort of thing.

* Add an option for safe type conversions; that is, report an error

  rather than silently truncating out-of-range values to 0 (namely int64 ->

  int).

* Add support for copying settings from one configuration to another. Need a

  recursive function to copy a setting and call itself on all child settings.

* Add a += operator, so that additional elements can be appended to a list or

  array. The issue with this is defining a consistent syntax. For example:

  x = ( 1, 2, 3 );

  x += ( 4, 5 );

  Should this result in ( 1, 2, 3, 4, 5 ), or ( 1, 2, 3, ( 4, 5 ))? I believe

  it should be the latter. However, only the former makes sense for arrays.

* Add the ability to insert/delete elements at any position in a list or

  array. A simple implementation would be expensive (shift all the elements

  by one for every insert/delete), and a more efficient implementation would

  add a lot of complexity to the library.

* Add limited support for preserving comments?

* Add support for unicode strings? A bit problematic, since flex doesn't

  support unicode input, AFAICT. But maybe supply convenience functions to

  convert between parsed UTF-8 strings and std::wstring.