diff --git a/src/OpenFOAM/expressions/exprOps/exprOps.H b/src/OpenFOAM/expressions/exprOps/exprOps.H
new file mode 100644
index 0000000000..ec8c6d076d
--- /dev/null
+++ b/src/OpenFOAM/expressions/exprOps/exprOps.H
@@ -0,0 +1,136 @@
+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | www.openfoam.com
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+    Copyright (C) 2019 OpenCFD Ltd.
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+InNamespace
+    Foam::expressions
+
+Description
+    Operations involving expressions.
+
+SourceFiles
+    exprOps.H
+
+\*---------------------------------------------------------------------------*/
+
+#ifndef exprOps_H
+#define exprOps_H
+
+#include "scalar.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+namespace Foam
+{
+
+/*---------------------------------------------------------------------------*\
+                       Namespace expressions Declarations
+\*---------------------------------------------------------------------------*/
+
+namespace expressions
+{
+
+//- Convert [0-1] values (usually scalars) as false/true
+template<class T>
+struct boolOp
+{
+    bool operator()(const T& val) const
+    {
+        return (0.5 < Foam::mag(val));
+    }
+};
+
+//- Inverse of boolOp()
+template<class T>
+struct boolNotOp
+{
+    bool operator()(const T& val) const
+    {
+        return (Foam::mag(val) < 0.5);
+    }
+};
+
+//- Convert to bool, pass-through for bool
+template<>
+struct boolOp<bool>
+{
+    bool operator()(bool val) const
+    {
+        return val;
+    }
+};
+
+//- Inverse of boolOp, no conversion required for bool
+template<>
+struct boolNotOp<bool>
+{
+    bool operator()(bool val) const
+    {
+        return !val;
+    }
+};
+
+//- Logical 'and', possibly with scalars as (false, true) values
+template<class T>
+struct boolAndOp
+{
+    bool operator()(const T& a, const T& b) const
+    {
+        return (boolOp<T>()(a) && boolOp<T>()(b));
+    }
+};
+
+//- Logical 'or', possibly with scalars as (false, true) values
+template<class T>
+struct boolOrOp
+{
+    bool operator()(const T& a, const T& b) const
+    {
+        return (boolOp<T>()(a) || boolOp<T>()(b));
+    }
+};
+
+//- Logical 'xor', possibly with scalars as (false, true) values
+template<class T>
+struct boolXorOp
+{
+    bool operator()(const T& a, const T& b) const
+    {
+        return (boolOp<T>()(a) != boolOp<T>()(b));
+    }
+};
+
+
+} // End namespace expressions
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+} // End namespace Foam
+
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+#endif
+
+// ************************************************************************* //
diff --git a/src/OpenFOAM/expressions/exprTools/exprTools.H b/src/OpenFOAM/expressions/exprTools/exprTools.H
index d720586633..c780388921 100644
--- a/src/OpenFOAM/expressions/exprTools/exprTools.H
+++ b/src/OpenFOAM/expressions/exprTools/exprTools.H
@@ -38,8 +38,8 @@ SourceFiles
 #ifndef exprTools_H
 #define exprTools_H
 
+#include "exprOps.H"
 #include "exprString.H"
-#include "scalar.H"
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
@@ -47,7 +47,7 @@ namespace Foam
 {
 
 /*---------------------------------------------------------------------------*\
-                        Namespace exprTools Declaration
+                       Namespace exprTools Declarations
 \*---------------------------------------------------------------------------*/
 
 namespace exprTools
@@ -100,81 +100,9 @@ List<expressions::exprString> getList
 );
 
 
-// Boolean-like values
-
-//- Convert [0-1] values (usually scalars) as false/true
-template<class T>
-struct toBoolOp
-{
-    int operator()(const T& val) const
-    {
-        return (0.5 < Foam::mag(val));
-    }
-};
-
-//- No conversion needed for bool
-template<>
-struct toBoolOp<bool>
-{
-    int operator()(bool val) const
-    {
-        return val;
-    }
-};
-
-//- Inverse test of toBoolOp()
-template<class T>
-struct toBoolNotOp
-{
-    int operator()(const T& val) const
-    {
-        return (Foam::mag(val) < 0.5);
-    }
-};
-
-//- Inverse test of toBoolOp, no conversion needed for bool
-template<>
-struct toBoolNotOp<bool>
-{
-    int operator()(bool val) const
-    {
-        return !val;
-    }
-};
-
-//- Logical 'and' with scalars as (false, true) values
-template<class T>
-struct toBoolAndOp
-{
-    int operator()(const T& a, const T& b) const
-    {
-        return (toBoolOp<T>()(a) && toBoolOp<T>()(b));
-    }
-};
-
-//- Logical 'or' with scalars as (false, true) values
-template<class T>
-struct toBoolOrOp
-{
-    int operator()(const T& a, const T& b) const
-    {
-        return (toBoolOp<T>()(a) || toBoolOp<T>()(b));
-    }
-};
-
-//- Logical 'xor' with scalars as (false, true) values
-template<class T>
-struct toBoolXorOp
-{
-    int operator()(const T& a, const T& b) const
-    {
-        return (toBoolOp<T>()(a) ? toBoolNotOp<T>()(b) : toBoolOp<T>()(b));
-    }
-};
-
-
 } // End namespace exprTools
 
+
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
 } // End namespace Foam