Add support for dumping LPs to iostreams

Quite handy when debugging LPs...

2 files changed, 17 insertions, 0 deletions

diff --git a/native/include/linprog/io.h b/native/include/linprog/io.h
index 1e8885f..e956671 100644
--- a/native/include/linprog/io.h
+++ b/native/include/linprog/io.h
@@ -9,6 +9,8 @@
 
 std::ostream& operator<<(std::ostream &os, const LinearExpression &exp);
 
+std::ostream& operator<<(std::ostream &os, const LinearProgram &lp);
+
 void dump_lp_solution(
         VarMapper& vars,
         const ResourceSharingInfo& info,
diff --git a/native/src/linprog/io.cpp b/native/src/linprog/io.cpp
index 14eeca5..801e833 100644
--- a/native/src/linprog/io.cpp
+++ b/native/src/linprog/io.cpp
@@ -22,6 +22,21 @@ std::ostream& operator<<(std::ostream &os, const LinearExpression &exp)
         return os;
 }
 
+std::ostream& operator<<(std::ostream &os, const LinearProgram &lp)
+{
+        os << "maximize " << *lp.get_objective() << " subject to:" << std::endl;
+        foreach (lp.get_equalities(), it)
+        {
+                os << *(it->first) << " = " << it->second << std::endl;
+        }
+        foreach (lp.get_inequalities(), it)
+        {
+                os << *(it->first) << " <= " << it->second << std::endl;
+        }
+
+        return os;
+}
+
 void dump_lp_solution(
         VarMapper& vars,
         const ResourceSharingInfo& info,