BUG: triSurface IO operators are asymmetrical (fixed #225)

- Also reported as http://bugs.openfoam.org/view.php?id=2188

applications/utilities/surface/surfaceMeshConvertTesting/surfaceMeshConvertTesting.C

@@ -97,7 +97,11 @@ int main(int argc, char *argv[])
         "surfMesh",
         "test surfMesh output"
     );
-    argList::addBoolOption("triSurface");
+    argList::addBoolOption
+    (
+        "triSurface",
+        "use triSurface for read/write"
+    );
     argList::addBoolOption
     (
         "unsorted",
@@ -164,10 +168,14 @@ int main(int argc, char *argv[])
             os << surf;
             IStringStream is(os.str());
 
+            // both work:
             triSurface surf2(is);
 
+            // OR
             // is.rewind();
-            // is >> surf2;    // FAIL: uses List<labelledTri> base class
+            // triSurface surf2;
+            // is >> surf2;
+
             // surf2.read(is); // FAIL: private method
         }
 

src/triSurface/triSurface/triSurface.C

@@ -1108,6 +1108,15 @@ void Foam::triSurface::operator=(const triSurface& ts)
 
 // * * * * * * * * * * * * * * * IOstream Operators  * * * * * * * * * * * * //
 
+Foam::Istream& Foam::operator>>(Istream& is, triSurface& sm)
+{
+    sm.clearOut();
+    sm.read(is);
+    sm.setDefaultPatches();
+    return is;
+}
+
+
 Foam::Ostream& Foam::operator<<(Ostream& os, const triSurface& sm)
 {
     sm.write(os);

src/triSurface/triSurface/triSurface.H

@@ -409,8 +409,9 @@ public:
         void operator=(const triSurface&);
 
 
-    // Ostream Operator
+    // IOstream Operators
 
+        friend Istream& operator>>(Istream&, triSurface&);
         friend Ostream& operator<<(Ostream&, const triSurface&);
 };