dotnet: Remove reference to dotnet release command

- Currently not implemented...

Add abseil patch

- Add patches/absl-config.cmake

Makefile: Add abseil-cpp on unix

- Force abseil-cpp SHA1 to 45221cc
  note: Just before the PR #136 which break all CMake

Makefile: Add abseil-cpp on windows

- Force abseil-cpp SHA1 to 45221cc
  note: Just before the PR #136 which break all CMake

CMake: Add abseil-cpp

- Force abseil-cpp SHA1 to 45221cc
  note: Just before the PR #136 which break all CMake

port to absl: C++ Part

- Fix warning with the use of ABSL_MUST_USE_RESULT
  > The macro must appear as the very first part of a function
    declaration or definition:
    ...
    Note: past advice was to place the macro after the argument list.
  src: dependencies/sources/abseil-cpp-master/absl/base/attributes.h:418
- Rename enum after windows clash
- Remove non compact table constraints
- Change index type from int64 to int in routing library
- Fix file_nonport compilation on windows
- Fix another naming conflict with windows (NO_ERROR is a macro)
- Cleanup hash containers; work on sat internals
- Add optional_boolean sub-proto

Sync cpp examples with internal code
- reenable issue173 after reducing number of loops

port to absl: Python Part

- Add back cp_model.INT32_MIN|MAX for examples

Update Python examples

- Add random_tsp.py
- Run words_square example
- Run magic_square in python tests

port to absl: Java Part

- Fix compilation of the new routing parameters in java
- Protect some code from SWIG parsing

Update Java Examples

port to absl: .Net Part

Update .Net examples

work on sat internals; Add C++ CP-SAT CpModelBuilder API; update sample code and recipes to use the new API; sync with internal code

Remove VS 2015 in Appveyor-CI

- abseil-cpp does not support VS 2015...

improve tables

upgrade C++ sat examples to use the new API; work on sat internals

update license dates

rewrite jobshop_ft06_distance.py to use the CP-SAT solver

rename last example

revert last commit

more work on SAT internals

fix

ortools/sat/simplification.h

@@ -24,12 +24,12 @@
 #include <set>
 #include <vector>
 
+#include "absl/types/span.h"
 #include "ortools/base/adjustable_priority_queue.h"
 #include "ortools/base/int_type.h"
 #include "ortools/base/int_type_indexed_vector.h"
 #include "ortools/base/integral_types.h"
 #include "ortools/base/macros.h"
-#include "ortools/base/span.h"
 #include "ortools/sat/drat_proof_handler.h"
 #include "ortools/sat/sat_base.h"
 #include "ortools/sat/sat_parameters.pb.h"
@@ -51,7 +51,7 @@ class SatPostsolver {
   // The postsolver will process the Add() calls in reverse order. If the given
   // clause has all its literals at false, it simply sets the literal x to true.
   // Note that x must be a literal of the given clause.
-  void Add(Literal x, const absl::Span<Literal> clause);
+  void Add(Literal x, const absl::Span<const Literal> clause);
 
   // Tells the postsolver that the given literal must be true in any solution.
   // We currently check that the variable is not already fixed.
@@ -154,7 +154,7 @@ class SatPresolver {
   // Adds new clause to the SatPresolver.
   void SetNumVariables(int num_variables);
   void AddBinaryClause(Literal a, Literal b);
-  void AddClause(absl::Span<Literal> clause);
+  void AddClause(absl::Span<const Literal> clause);
 
   // Presolves the problem currently loaded. Returns false if the model is
   // proven to be UNSAT during the presolving.