STYLE: provide return value for IOstream::fatalCheck()

- allows reuse as base implementation for IOstream::check()

src/OpenFOAM/db/IOstreams/IOstreams/IOstream.C

@@ -50,25 +50,22 @@ Foam::fileName& Foam::IOstream::name()
 
 bool Foam::IOstream::check(const char* operation) const
 {
-    if (bad())
-    {
-        FatalIOErrorInFunction(*this)
-            << "error in IOstream " << name() << " for operation " << operation
-            << exit(FatalIOError);
-    }
-
-    return !bad();
+    return fatalCheck(operation);
 }
 
 
-void Foam::IOstream::fatalCheck(const char* operation) const
+bool Foam::IOstream::fatalCheck(const char* operation) const
 {
-    if (bad())
+    const bool ok = !bad();
+
+    if (!ok)
     {
         FatalIOErrorInFunction(*this)
             << "error in IOstream " << name() << " for operation " << operation
             << exit(FatalIOError);
     }
+
+    return ok;
 }
 
 

src/OpenFOAM/db/IOstreams/IOstreams/IOstream.H

@@ -199,12 +199,14 @@ public:
     // Check
 
         //- Check IOstream status for given operation.
-        //  Print IOstream state if error has occurred
+        //  Print IOstream state or generate a FatalIOError
+        //  when an error has occurred.
+        //  The base implementation is a fatalCheck
         virtual bool check(const char* operation) const;
 
         //- Check IOstream status for given operation.
-        //  Print IOstream state if error has occurred and exit
-        void fatalCheck(const char* operation) const;
+        //  Generate a FatalIOError when an error has occurred.
+        bool fatalCheck(const char* operation) const;
 
         //- Return true if stream has been opened
         bool opened() const