ENH: make treatment of stream allocators more uniform (issue #532)

- use allocator class to wrap the stream pointers instead of passing
  them into ISstream, OSstream and using a dynamic cast to delete
  then. This is especially important if we will have a bidirectional
  stream (can't delete twice!).

STYLE:

- file stream constructors with std::string (C++11)

- for rewind, explicit about in|out direction. This is not currently
  important, but avoids surprises with any future bidirectional access.

- combined string streams in StringStream.H header.
  Similar to <sstream> include that has both input and output string
  streams.

src/meshTools/edgeMesh/edgeMeshFormats/nas/NASedgeFormat.C

@@ -25,7 +25,7 @@ License
 
 #include "NASedgeFormat.H"
 #include "IFstream.H"
-#include "IStringStream.H"
+#include "StringStream.H"
 #include "PackedBoolList.H"
 
 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //

src/meshTools/edgeMesh/edgeMeshFormats/obj/OBJedgeFormat.C

@@ -26,7 +26,7 @@ License
 #include "OBJedgeFormat.H"
 #include "clock.H"
 #include "IFstream.H"
-#include "IStringStream.H"
+#include "StringStream.H"
 #include "Ostream.H"
 #include "OFstream.H"
 #include "ListOps.H"

src/meshTools/edgeMesh/edgeMeshFormats/starcd/STARCDedgeFormat.C

@@ -27,7 +27,7 @@ License
 #include "ListOps.H"
 #include "clock.H"
 #include "PackedBoolList.H"
-#include "IStringStream.H"
+#include "StringStream.H"
 
 // * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 

src/meshTools/output/foamVtkWriteCellSetFaces.C

@@ -45,7 +45,7 @@ void Foam::vtk::writeCellSetFaces
 
     const bool legacy_(opts.legacy());
 
-    std::ofstream os((baseName + (legacy_ ? ".vtk" : ".vtp")).c_str());
+    std::ofstream os(baseName + (legacy_ ? ".vtk" : ".vtp"));
 
     autoPtr<vtk::formatter> format = opts.newFormatter(os);
 

src/meshTools/output/foamVtkWriteFaceSet.C

@@ -45,7 +45,7 @@ void Foam::vtk::writeFaceSet
 
     const bool legacy_(opts.legacy());
 
-    std::ofstream os((baseName + (legacy_ ? ".vtk" : ".vtp")).c_str());
+    std::ofstream os(baseName + (legacy_ ? ".vtk" : ".vtp"));
 
     autoPtr<vtk::formatter> format = opts.newFormatter(os);
 

src/meshTools/output/foamVtkWritePointSet.C

@@ -44,7 +44,7 @@ void Foam::vtk::writePointSet
 
     const bool legacy_(opts.legacy());
 
-    std::ofstream os((baseName + (legacy_ ? ".vtk" : ".vtp")).c_str());
+    std::ofstream os(baseName + (legacy_ ? ".vtk" : ".vtp"));
 
     autoPtr<vtk::formatter> format = opts.newFormatter(os);