This file lists "large-ish" changes to the std++ Coq library, but not every
API-breaking change is listed.

## std++ master

Numerous functions and theorems have been renamed.

- Consistently use `set` instead of `collection`.
- Rename the `Collection` type class into `Set_`. Likewise, `SimpleCollection`
  is called `SemiSet`, and `FinCollection` is called `FinSet`, and
  `CollectionMonad` is called `MonadSet`.
- Rename `collections.v` and `fin_collections.v` into `sets.v` and `fin_sets.v`,
  respectively.
- Rename `set A := A → Prop` (`theories/set.v`) into `propset`, and likewise
  `bset` into `boolset`.
- Consistently prefer `X_to_Y` for conversion functions, e.g. `list_to_map`
  instead of the former `map_of_list`.

The following `sed` script should get you a long way:

```
sed '
s/SimpleCollection/SemiSet/g;
s/FinCollection/FinSet/g;
s/CollectionMonad/MonadSet/g;
s/Collection/Set\_/g;
s/collection\_simple/set\_semi\_set/g;
s/fin\_collection/fin\_set/g;
s/collection\_monad\_simple/monad\_set\_semi\_set/g;
s/collection\_equiv/set\_equiv/g;
s/\bbset/boolset/g;
s/mkBSet/BoolSet/g;
s/mkSet/PropSet/g;
s/set\_equivalence/set\_equiv\_equivalence/g;
s/collection\_subseteq/set\_subseteq/g;
s/collection\_disjoint/set\_disjoint/g;
s/collection\_fold/set\_fold/g;
s/collection\_map/set\_map/g;
s/collection\_size/set\_size/g;
s/collection\_filter/set\_filter/g;
s/collection\_guard/set\_guard/g;
s/collection\_choose/set\_choose/g;
s/collection\_ind/set\_ind/g;
s/collection\_wf/set\_wf/g;
s/map\_to\_collection/map\_to\_set/g;
s/map\_of\_collection/set\_to\_map/g;
s/map\_of\_list/list\_to\_map/g;
s/map\_of\_to_list/list\_to\_map\_to\_list/g;
s/map\_to\_of\_list/map\_to\_list\_to\_map/g;
s/\bof\_list/list\_to\_set/g;
s/\bof\_option/option\_to\_set/g;
s/elem\_of\_of\_list/elem\_of\_list\_to\_set/g;
s/elem\_of\_of\_option/elem\_of\_option\_to\_set/g;
s/collection\_not\_subset\_inv/set\_not\_subset\_inv/g;
s/seq\_set/set\_seq/g;
s/collections/sets/g;
s/collection/set/g;
s/to\_gmap/gset\_to\_gmap/g;
s/of\_bools/bools\_to\_natset/g;
s/to_bools/natset\_to\_bools/g;
s/coPset\.of_gset/gset\_to\_coPset/g;
s/coPset\.elem\_of\_of\_gset/elem\_of\_gset\_to\_coPset/g;
s/of\_gset\_finite/gset\_to\_coPset\_finite/g;
s/set\_seq\_S\_disjoint/set\_seq\_S\_end\_disjoint/g;
s/set\_seq\_S\_union/set\_seq\_S\_end\_union/g;
s/map\_to\_of\_list/map\_to\_list\_to\_map/g;
s/of\_bools/bools\_to\_natset/g;
s/to\_bools/natset\_to\_bools/g;
' -i $(find -name "*.v")
```

## std++ 1.1.0 (released 2017-12-19)

Coq 8.5 is no longer supported by this release of std++.  Use std++ 1.0 if you
have to use Coq 8.5.

New features:

- Many new lemmas about lists, vectors, sets, maps.
- Equivalence proofs between std++ functions and their alternative in the the
  Coq standard library, e.g. `List.nth`, `List.NoDop`.
- Typeclass versions of the logical connectives and list predicates:
  `TCOr`, `TCAnd`, `TCTrue`, `TCForall`, `TCForall2`.
- A function `tc_opaque` to make definitions type class opaque.
- A type class `Infinite` for infinite types.
- A generic implementation to obtain fresh elements of infinite types.
- More theory about curry and uncurry functions on `gmap`.
- A generic `filter` and `zip_with` operation on finite maps.
- A type of generic trees for showing that arbitrary types are countable.

Changes:

- Get rid of `Automatic Coercions Import`, it is deprecated.
  Also get rid of `Set Asymmetric Patterns`.
- Various changes and improvements to `f_equiv` and `solve_proper`.
- `Hint Mode` is now set for all operational type classes to make instance
  search less likely to diverge.
- New type class `RelDecision` for decidable relations, and `EqDecision` is
  defined in terms of it. This class allows to set `Hint Mode` properly.
- Use the flag `assert` of `Arguments` to make it more robust.
- The functions `imap` and `imap2` on lists are defined so that they enjoy more
  definitional equalities.
- Theory about `fin` is moved to its own file `fin.v`.
- Rename `preserving` → `mono`.

Changes to notations:

- Operational type classes for lattice notations: `⊑`,`⊓`, `⊔`, `⊤` `⊥`.
- Replace `⊥` for disjointness with `##`, so that `⊥` can be used for the
  bottom lattice element.
- All notations are now in `stdpp_scope` with scope key `stdpp`
  (formerly `C_scope` and `C`).
- Higher precedence for `.1` and `.2` that is compatible with ssreflect.
- Various changes to monadic notations to improve compatibility with Mtac2:
  + Pattern matching notation for monadic bind `'pat ← x; y` where `pat` can
    be any Coq pattern.
  + Change the level of the do-notation.
  + `<$>` is left associative.
  + Notation `x ;; y` for `_ ← x; y`.

## History

Coq-std++ has originally been developed by Robbert Krebbers as part of his
formalization of the C programming language in his PhD thesis, called
[CH2O](http://robbertkrebbers.nl/thesis.html). After that, Coq-std++ has been
part of the [Iris project](http://iris-project.org), and has continued to be
developed by Robbert Krebbers, Ralf Jung, and Jacques Henri-Jourdan.