diff --git a/src/OpenFOAM/fields/cloud/cloud.C b/src/OpenFOAM/fields/cloud/cloud.C
index 172d6aac74..6d0aeb3dc0 100644
--- a/src/OpenFOAM/fields/cloud/cloud.C
+++ b/src/OpenFOAM/fields/cloud/cloud.C
@@ -3,7 +3,7 @@
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
     \\  /    A nd           | Copyright (C) 2011-2016 OpenFOAM Foundation
-     \\/     M anipulation  | Copyright (C) 2016 OpenCFD Ltd.
+     \\/     M anipulation  | Copyright (C) 2016-2018 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -31,11 +31,19 @@ License
 namespace Foam
 {
     defineTypeNameAndDebug(cloud, 0);
-
-    const word cloud::prefix("lagrangian");
-    word cloud::defaultName("defaultCloud");
 }
 
+const Foam::word Foam::cloud::prefix("lagrangian");
+Foam::word Foam::cloud::defaultName("defaultCloud");
+
+const Foam::Enum<Foam::cloud::geometryType>
+Foam::cloud::geometryTypeNames
+{
+    { geometryType::COORDINATES, "coordinates" },
+    { geometryType::POSITIONS, "positions" }
+};
+
+
 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
 Foam::cloud::cloud(const objectRegistry& obr, const word& cloudName)
@@ -55,12 +63,6 @@ Foam::cloud::cloud(const objectRegistry& obr, const word& cloudName)
 {}
 
 
-// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
-
-Foam::cloud::~cloud()
-{}
-
-
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
 void Foam::cloud::autoMap(const mapPolyMesh&)
diff --git a/src/OpenFOAM/fields/cloud/cloud.H b/src/OpenFOAM/fields/cloud/cloud.H
index 844cb9db4e..eab0f39042 100644
--- a/src/OpenFOAM/fields/cloud/cloud.H
+++ b/src/OpenFOAM/fields/cloud/cloud.H
@@ -3,7 +3,7 @@
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
     \\  /    A nd           | Copyright (C) 2011-2016 OpenFOAM Foundation
-     \\/     M anipulation  | Copyright (C) 2016 OpenCFD Ltd.
+     \\/     M anipulation  | Copyright (C) 2016-2018 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -25,7 +25,7 @@ Class
     Foam::cloud
 
 Description
-    A cloud is a collection of lagrangian particles
+    A cloud is a registry collection of lagrangian particles.
 
 SourceFiles
     cloud.C
@@ -36,6 +36,7 @@ SourceFiles
 #define cloud_H
 
 #include "objectRegistry.H"
+#include "Enum.H"
 #include "IOField.H"
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
@@ -58,14 +59,24 @@ class cloud
     // Private Member Functions
 
         //- Disallow default bitwise copy construct
-        cloud(const cloud&);
+        cloud(const cloud&) = delete;
 
         //- Disallow default bitwise assignment
-        void operator=(const cloud&);
+        void operator=(const cloud&) = delete;
 
 
 public:
 
+    //- Cloud geometry type (internal or IO representations)
+    enum class geometryType
+    {
+        COORDINATES,    //!< barycentric coordinates
+        POSITIONS       //!< positions
+    };
+
+    static const Enum<geometryType> geometryTypeNames;
+
+
     //- Runtime type information
     TypeName("cloud");
 
@@ -83,7 +94,7 @@ public:
 
 
     //- Destructor
-    virtual ~cloud();
+    virtual ~cloud() = default;
 
 
     // Member Functions
diff --git a/src/lagrangian/basic/Cloud/Cloud.C b/src/lagrangian/basic/Cloud/Cloud.C
index d5da7fe151..a70703ca3e 100644
--- a/src/lagrangian/basic/Cloud/Cloud.C
+++ b/src/lagrangian/basic/Cloud/Cloud.C
@@ -79,7 +79,7 @@ Foam::Cloud<ParticleType>::Cloud
     polyMesh_(pMesh),
     labels_(),
     globalPositionsPtr_(),
-    geometryType_(IOPosition<Cloud<ParticleType>>::geometryType::COORDINATES)
+    geometryType_(cloud::geometryType::COORDINATES)
 {
     checkPatches();
 
diff --git a/src/lagrangian/basic/Cloud/Cloud.H b/src/lagrangian/basic/Cloud/Cloud.H
index 33d554c977..e1ce3d2ba6 100644
--- a/src/lagrangian/basic/Cloud/Cloud.H
+++ b/src/lagrangian/basic/Cloud/Cloud.H
@@ -109,7 +109,7 @@ class Cloud
 protected:
 
         //- Geometry type
-        typename IOPosition<Cloud<ParticleType>>::geometryType geometryType_;
+        cloud::geometryType geometryType_;
 
 
 public:
diff --git a/src/lagrangian/basic/Cloud/CloudIO.C b/src/lagrangian/basic/Cloud/CloudIO.C
index d5fe11ace8..9f600de036 100644
--- a/src/lagrangian/basic/Cloud/CloudIO.C
+++ b/src/lagrangian/basic/Cloud/CloudIO.C
@@ -57,11 +57,11 @@ void Foam::Cloud<ParticleType>::readCloudUniformProperties()
         // Fall back to positions mode if the entry is not present for
         // backwards compatibility
         geometryType_ =
-            IOPosition<Cloud<ParticleType>>::geometryTypeNames_.lookupOrDefault
+            cloud::geometryTypeNames.lookupOrDefault
             (
                 "geometry",
                 uniformPropsDict,
-                IOPosition<Cloud<ParticleType>>::geometryType::POSITIONS
+                cloud::geometryType::POSITIONS
             );
 
         const word procName("processor" + Foam::name(Pstream::myProcNo()));
@@ -104,7 +104,7 @@ void Foam::Cloud<ParticleType>::writeCloudUniformProperties() const
     uniformPropsDict.add
     (
         "geometry",
-        IOPosition<Cloud<ParticleType>>::geometryTypeNames_[geometryType_]
+        cloud::geometryTypeNames[geometryType_]
     );
 
     forAll(np, i)
@@ -146,8 +146,8 @@ void Foam::Cloud<ParticleType>::initCloud(const bool checkClass)
             << "Assuming the initial cloud contains 0 particles." << endl;
     }
 
-    // Always operate in co-ordinates mode after reading
-    geometryType_ = IOPosition<Cloud<ParticleType>>::geometryType::COORDINATES;
+    // Always operate in coordinates mode after reading
+    geometryType_ = cloud::geometryType::COORDINATES;
 
     // Ask for the tetBasePtIs to trigger all processors to build
     // them, otherwise, if some processors have no particles then
@@ -170,7 +170,7 @@ Foam::Cloud<ParticleType>::Cloud
     polyMesh_(pMesh),
     labels_(),
     cellWallFacesPtr_(),
-    geometryType_(IOPosition<Cloud<ParticleType>>::geometryType::COORDINATES)
+    geometryType_(cloud::geometryType::COORDINATES)
 {
     checkPatches();
 
diff --git a/src/lagrangian/basic/IOPosition/IOPosition.C b/src/lagrangian/basic/IOPosition/IOPosition.C
index 959db07300..2a1cd0e917 100644
--- a/src/lagrangian/basic/IOPosition/IOPosition.C
+++ b/src/lagrangian/basic/IOPosition/IOPosition.C
@@ -23,31 +23,20 @@ License
 
 \*---------------------------------------------------------------------------*/
 
-// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
-
-template<class CloudType>
-const Foam::Enum<typename Foam::IOPosition<CloudType>::geometryType>
-Foam::IOPosition<CloudType>::geometryTypeNames_
-{
-    { geometryType::POSITIONS, "positions" },
-    { geometryType::COORDINATES, "coordinates" }
-};
-
-
 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
 template<class CloudType>
 Foam::IOPosition<CloudType>::IOPosition
 (
     const CloudType& c,
-    const geometryType& geomType
+    const cloud::geometryType& geomType
 )
 :
     regIOobject
     (
         IOobject
         (
-            geometryTypeNames_[geomType],
+            cloud::geometryTypeNames[geomType],
             c.time().timeName(),
             c,
             IOobject::MUST_READ,
@@ -75,16 +64,7 @@ bool Foam::IOPosition<CloudType>::writeData(Ostream& os) const
 
     switch (geometryType_)
     {
-        case geometryType::POSITIONS:
-        {
-            forAllConstIters(cloud_, iter)
-            {
-                iter().writePosition(os);
-                os  << nl;
-            }
-            break;
-        }
-        case geometryType::COORDINATES:
+        case cloud::geometryType::COORDINATES:
         {
             forAllConstIters(cloud_, iter)
             {
@@ -93,6 +73,15 @@ bool Foam::IOPosition<CloudType>::writeData(Ostream& os) const
             }
             break;
         }
+        case cloud::geometryType::POSITIONS:
+        {
+            forAllConstIters(cloud_, iter)
+            {
+                iter().writePosition(os);
+                os  << nl;
+            }
+            break;
+        }
     }
 
     os  << token::END_LIST << endl;
@@ -108,7 +97,7 @@ void Foam::IOPosition<CloudType>::readData(Istream& is, CloudType& c)
 
     token firstToken(is);
 
-    bool newFormat = geometryType_ == geometryType::COORDINATES;
+    const bool newFormat = (geometryType_ == cloud::geometryType::COORDINATES);
 
     if (firstToken.isLabel())
     {
diff --git a/src/lagrangian/basic/IOPosition/IOPosition.H b/src/lagrangian/basic/IOPosition/IOPosition.H
index 4f1ef401f4..ad96bc8dd0 100644
--- a/src/lagrangian/basic/IOPosition/IOPosition.H
+++ b/src/lagrangian/basic/IOPosition/IOPosition.H
@@ -35,8 +35,8 @@ SourceFiles
 #ifndef IOPosition_H
 #define IOPosition_H
 
+#include "cloud.H"
 #include "regIOobject.H"
-#include "Enum.H"
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
@@ -52,22 +52,9 @@ class IOPosition
 :
     public regIOobject
 {
-public:
-
-    enum class geometryType
-    {
-        POSITIONS,
-        COORDINATES
-    };
-
-    static const Enum<geometryType> geometryTypeNames_;
-
-
-private:
-
     // Private data
 
-        geometryType geometryType_;
+        cloud::geometryType geometryType_;
 
         //- Reference to the cloud
         const CloudType& cloud_;
@@ -90,7 +77,8 @@ public:
         IOPosition
         (
             const CloudType& c,
-            const geometryType& geomType = geometryType::COORDINATES
+            const cloud::geometryType& geomType
+              = cloud::geometryType::COORDINATES
         );
 
 
diff --git a/src/lagrangian/basic/injectedParticle/injectedParticleCloud.C b/src/lagrangian/basic/injectedParticle/injectedParticleCloud.C
index 91a4e49884..fa505da426 100644
--- a/src/lagrangian/basic/injectedParticle/injectedParticleCloud.C
+++ b/src/lagrangian/basic/injectedParticle/injectedParticleCloud.C
@@ -41,8 +41,7 @@ Foam::injectedParticleCloud::injectedParticleCloud
 :
     Cloud<injectedParticle>(mesh, cloudName, false)
 {
-    geometryType_ =
-        IOPosition<Cloud<injectedParticle>>::geometryType::POSITIONS;
+    geometryType_ = cloud::geometryType::POSITIONS;
 
     if (readFields)
     {
diff --git a/src/lagrangian/basic/particle/particleTemplates.C b/src/lagrangian/basic/particle/particleTemplates.C
index 71472677d2..a96ba9f381 100644
--- a/src/lagrangian/basic/particle/particleTemplates.C
+++ b/src/lagrangian/basic/particle/particleTemplates.C
@@ -40,7 +40,7 @@ License
 template<class TrackCloudType>
 void Foam::particle::readFields(TrackCloudType& c)
 {
-    bool valid = c.size();
+    const bool valid = c.size();
 
     IOobject procIO(c.fieldIOobject("origProcId", IOobject::MUST_READ));
 
@@ -70,7 +70,7 @@ void Foam::particle::readFields(TrackCloudType& c)
 template<class TrackCloudType>
 void Foam::particle::writeFields(const TrackCloudType& c)
 {
-    label np = c.size();
+    const label np = c.size();
 
     if (writeLagrangianCoordinates)
     {
@@ -84,7 +84,7 @@ void Foam::particle::writeFields(const TrackCloudType& c)
         IOPosition<TrackCloudType> ioP
         (
             c,
-            IOPosition<TrackCloudType>::geometryType::POSITIONS
+            cloud::geometryType::POSITIONS
         );
         ioP.write(np > 0);
     }
@@ -116,7 +116,7 @@ void Foam::particle::writeFields(const TrackCloudType& c)
 template<class CloudType>
 void Foam::particle::writeObjects(const CloudType& c, objectRegistry& obr)
 {
-    label np = c.size();
+    const label np = c.size();
 
     IOField<label>& origProc(cloud::createIOField<label>("origProc", np, obr));
     IOField<label>& origId(cloud::createIOField<label>("origId", np, obr));
diff --git a/src/parallel/reconstruct/reconstruct/reconstructLagrangianPositions.C b/src/parallel/reconstruct/reconstruct/reconstructLagrangianPositions.C
index 30622183ec..1b5d017ef3 100644
--- a/src/parallel/reconstruct/reconstruct/reconstructLagrangianPositions.C
+++ b/src/parallel/reconstruct/reconstruct/reconstructLagrangianPositions.C
@@ -84,7 +84,7 @@ void Foam::reconstructLagrangianPositions
         IOPosition<Cloud<passiveParticle>>
         (
             lagrangianPositions,
-            IOPosition<Cloud<passiveParticle>>::geometryType::POSITIONS
+            cloud::geometryType::POSITIONS
         ).write();
     }
 }