CGlue 0.2.10

Changes in 0.2.10:

Rename Tup to CTup

Changes in 0.2.9 (yanked):

Add C tuples

Changes in 0.2.8:

Allow to provide custom implemenetations for generics functions

Re-export custom_impl macro.

Changes in 0.2.7:

Add more helpers to CVec

Parse different expressions in the cast macros

Expose CArcSome:

• This is equivalent to Arc, and is essentially a pre-null-checked version of CArc.