From 7fe6fca4dfce4e94b7ec9c96cfca67c8da00c057 Mon Sep 17 00:00:00 2001
From: andy <a.heather@opencfd.co.uk>
Date: Wed, 21 Jan 2009 16:55:25 +0000
Subject: [PATCH] added helper function for writing entries if not default

---
 .../fvPatchFields/fvPatchField/fvPatchField.C   | 17 +++++++++++++++++
 .../fvPatchFields/fvPatchField/fvPatchField.H   | 17 +++++++++++++++--
 2 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/src/finiteVolume/fields/fvPatchFields/fvPatchField/fvPatchField.C b/src/finiteVolume/fields/fvPatchFields/fvPatchField/fvPatchField.C
index 4e01c64d74..637cf8037a 100644
--- a/src/finiteVolume/fields/fvPatchFields/fvPatchField/fvPatchField.C
+++ b/src/finiteVolume/fields/fvPatchFields/fvPatchField/fvPatchField.C
@@ -244,6 +244,23 @@ void Foam::fvPatchField<Type>::write(Ostream& os) const
 }
 
 
+template<class Type>
+template<class EntryType>
+void Foam::fvPatchField<Type>::writeEntryIfDifferent
+(
+    Ostream& os,
+    const word& entryName,
+    const EntryType& value1,
+    const EntryType& value2
+) const
+{
+    if (value1 != value2)
+    {
+        os.writeKeyword(entryName) << value2 << token::END_STATEMENT << nl;
+    }
+}
+
+
 // * * * * * * * * * * * * * * * Member Operators  * * * * * * * * * * * * * //
 
 template<class Type>
diff --git a/src/finiteVolume/fields/fvPatchFields/fvPatchField/fvPatchField.H b/src/finiteVolume/fields/fvPatchFields/fvPatchField/fvPatchField.H
index 701dd9fb4e..851d9d33ae 100644
--- a/src/finiteVolume/fields/fvPatchFields/fvPatchField/fvPatchField.H
+++ b/src/finiteVolume/fields/fvPatchFields/fvPatchField/fvPatchField.H
@@ -414,8 +414,21 @@ public:
             virtual void manipulateMatrix(fvMatrix<Type>& matrix);
 
 
-        //- Write
-        virtual void write(Ostream&) const;
+        // I-O
+
+            //- Write
+            virtual void write(Ostream&) const;
+
+            //- Helper function to write the keyword and entry only if the
+            //  values are not equal. The value is then output as value2
+            template<class EntryType>
+            void writeEntryIfDifferent
+            (
+                Ostream& os,
+                const word& entryName,
+                const EntryType& value1,
+                const EntryType& value2
+            ) const;
 
 
         // Check