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# Coq-std++ [[coqdoc]](https://plv.mpi-sws.org/coqdoc/stdpp/)
This project contains an extended "Standard Library" for Coq called coq-std++.
The key features of this library are as follows:
- It provides a great number of definitions and lemmas for common data
structures such as lists, finite maps, finite sets, and finite multisets.
- It uses type classes for common notations (like `∅`, `∪`, and Haskell-style
monad notations) so that these can be overloaded for different data structures.
- It uses type classes to keep track of common properties of types, like it
having decidable equality or being countable or finite.
- Most data structures are represented in canonical ways so that Leibniz
equality can be used as much as possible (for example, for maps we have
`m1 = m2` iff `∀ i, m1 !! i = m2 !! i`). On top of that, the library provides
setoid instances for most types and operations.
- It provides various tactics for common tasks, like an ssreflect inspired
`done` tactic for finishing trivial goals, a simple breadth-first solver
`naive_solver`, an equality simplifier `simplify_eq`, a solver `solve_proper`
for proving compatibility of functions with respect to relations, and a solver
`set_solver` for goals involving set operations.
- It is entirely dependency- and axiom-free.
## Side-effects
Importing std++ has some side effects as the library sets some global options.
Notably:
* `Generalizable All Variables`: This option enables implicit generalization in
arguments of the form `` `{...}`` (i.e., anonymous arguments). Unfortunately, it
also enables implicit generalization in `Instance`. We think that the fact
[bug in Coq](https://github.com/coq/coq/issues/6030).
* The behavior of `Program` is tweaked: `Unset Transparent Obligations`,
`Obligation Tactic := idtac`, `Add Search Blacklist "_obligation_"`. See
* It blocks `simpl` on all operations involving integers `Z` (by setting
`Arguments op : simpl never`). We do this because `simpl` tends to expose
the internals of said operations (e.g. try `simpl` on `Z.of_nat (S n) + y`).
As a consequence of blocking `simpl`, due to
[Coq bug #5039](https://github.com/coq/coq/issues/5039) the `omega` tactic
becomes unreliable. We do not consider this an issue since we use `lia` (for
which the aforementioned Coq bug was fixed) instead of `omega` everywhere.
## Prerequisites
This version is known to compile with:
- Coq version 8.10.2 / 8.11.2 / 8.12.2 / 8.13.2 / 8.14.0
To obtain the latest stable release via opam (2.0.0 or newer), you have to add
opam repo add coq-released https://coq.inria.fr/opam/released
To obtain a development version, add the Iris opam repository:
opam repo add iris-dev https://gitlab.mpi-sws.org/iris/opam.git
Run `make -jN` in this directory to build the library, where `N` is the number
of your CPU cores. Then run `make install` to install the library.
## Contributing to std++
If you want to report a bug, please use the
[issue tracker](https://gitlab.mpi-sws.org/iris/stdpp/issues). You will have to
create an account at the
[MPI-SWS GitLab](https://gitlab.mpi-sws.org/users/sign_in) (use the "Register"
tab).
To contribute code, please send your MPI-SWS GitLab username to
[Ralf Jung](https://gitlab.mpi-sws.org/jung) to enable personal projects for
your account. Then you can fork the
[Coq-std++ git repository](https://gitlab.mpi-sws.org/iris/stdpp), make your
changes in your fork, and create a merge request.
## Common problems
On Windows, differences in line endings may cause tests to fail. This can be
fixed by setting Git's autocrlf option to true: