v9.9

Dependencies

• abseil-cpp 20240116.1.
• re2 2024-02-01.
• Protobuf v25.3.
• Scip v810.
• pybind11 v2.11.1.
• googletest 1.14.0.

C++ Changes

• use of absl::Span instead of std::vector.
• replace const std::string& with absl::string_view.
• use of absl log.

CP-SAT

• Improvements to no_overlap_2d algorithms.
• rewrite python API to be pep8 compliant. model.AddBoolOr -> model.add_bool_or
• Improve the linear propagator code.
• Use the ~ operator in C++ and Python for the negation of a literal.

Linear Solver

• make XPRESS support using a dynamic load (like gurobi support)

Math Opt

• Sync with google3
• Add c++ and python support in CMake based build.
• Add math_opt in Python wheel package
• Enable few C++ tests with bazel based build.

Known Issue

• Python windows wheel package are 108Mb so we can't upload them to pypi yet.
  note: a file limite request has been filled (pypi/support#3714)

• Build on Ubuntu 20.04 LTS failed -> no archives available for this OS...
  dev note: looking at the trace of the release process...

  $ cd tools/docker
  $ make amd64_ubuntu-20.04_cpp_build
  ...
  In file included from /root/or-tools/ortools/graph/dag_constrained_shortest_path.cc:14:
  /root/or-tools/ortools/graph/dag_constrained_shortest_path.h:18:10: fatal error: concepts: No such file or directory
     18 | #include <concepts>
        |          ^~~~~~~~~~
  

  This means or-tools source code is poissed with C++20 headers since google3 now allow C++20...
  => Will have no choice but to drop C++17 support in the short term as an internal component of google3 code base.

What's Changed

• build(deps): bump urllib3 from 2.0.4 to 2.0.7 in /bazel by @dependabot in #3988
• Fix memory leaks in file::GetContents and file::SetContents by @pjh in #4011
• build(deps): bump jupyter-server from 2.7.2 to 2.11.2 in /bazel by @dependabot in #4014
• Improve the Xpress interface and add dynamic loading of the Xpress library by @sgatto in #3966
• improve performance of Xpress interface and fix bug by @sgatto in #4030
• build(deps): bump jinja2 from 3.1.2 to 3.1.3 in /bazel by @dependabot in #4049
• Include LICENSE file in Python distribution by @chrisjbremner in #4048

New Contributors

• @pjh made their first contribution in #4011
• @sgatto made their first contribution in #3966
• @chrisjbremner made their first contribution in #4048

Full Changelog: v9.8...v9.9