STYLE: use default constructors/destructors for base cloud classes

- use cloud::defaultName instead of "defaultCloud" string literal

applications/utilities/parallelProcessing/redistributePar/passivePositionParticleCloud.H

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2017 OpenCFD Ltd.
+    \\  /    A nd           | Copyright (C) 2017-2019 OpenCFD Ltd.
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -68,10 +68,10 @@ public:
     // Constructors
 
         //- Construct given mesh
-        passivePositionParticleCloud
+        explicit passivePositionParticleCloud
         (
-            const polyMesh&,
+            const polyMesh& mesh,
-            const word& cloudName = "defaultCloud",
+            const word& cloudName = cloud::defaultName,
             bool readFields = true
         );
 

applications/utilities/parallelProcessing/redistributePar/unmappedPassivePositionParticleCloud.H

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           |
+    \\  /    A nd           | Copyright (C) 2019 OpenCFD Ltd.
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
                             | Copyright (C) 2015 OpenFOAM Foundation
@@ -59,10 +59,10 @@ public:
     // Constructors
 
         //- Construct given mesh
-        unmappedPassivePositionParticleCloud
+        explicit unmappedPassivePositionParticleCloud
         (
             const polyMesh& mesh,
-            const word& cloudName = "defaultCloud",
+            const word& cloudName = cloud::defaultName,
             bool readFields = true
         )
         :
@@ -80,9 +80,12 @@ public:
             passivePositionParticleCloud(mesh, cloudName, particles)
         {}
 
+
     //- Destructor
-        virtual ~unmappedPassivePositionParticleCloud()
+    virtual ~unmappedPassivePositionParticleCloud() = default;
-        {}
+
+
+    // Member Functions
 
         //- Switch off remapping of cells of particles when
         //  mesh topology changes

src/functionObjects/field/streamLine/streamLineParticleCloud.H

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           |
+    \\  /    A nd           | Copyright (C) 2019 OpenCFD Ltd.
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
                             | Copyright (C) 2011-2016 OpenFOAM Foundation
@@ -67,13 +67,14 @@ public:
     //- Type of parcel the cloud was instantiated for
     typedef streamLineParticle parcelType;
 
+
     // Constructors
 
         //- Construct given mesh
-        streamLineParticleCloud
+        explicit streamLineParticleCloud
         (
-            const polyMesh&,
+            const polyMesh& mesh,
-            const word& cloudName = "defaultCloud",
+            const word& cloudName = cloud::defaultName,
             bool readFields = true
         );
 

src/functionObjects/field/wallBoundedStreamLine/wallBoundedStreamLineParticleCloud.H

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           |
+    \\  /    A nd           | Copyright (C) 2019 OpenCFD Ltd.
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
                             | Copyright (C) 2011-2016 OpenFOAM Foundation
@@ -70,13 +70,14 @@ public:
     //- Type of parcel the cloud was instantiated for
     typedef wallBoundedStreamLineParticle parcelType;
 
+
     // Constructors
 
         //- Construct given mesh
-        wallBoundedStreamLineParticleCloud
+        explicit wallBoundedStreamLineParticleCloud
         (
-            const polyMesh&,
+            const polyMesh& mesh,
-            const word& cloudName = "defaultCloud",
+            const word& cloudName = cloud::defaultName,
             bool readFields = true
         );
 

src/lagrangian/DSMC/clouds/baseClasses/DSMCBaseCloud/DSMCBaseCloud.C

@@ -2,10 +2,8 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           |
+    \\  /    A nd           | Copyright (C) 2011-2019 OpenCFD Ltd.
      \\/     M anipulation  |
--------------------------------------------------------------------------------
-                            | Copyright (C) 2011-2015 OpenFOAM Foundation
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -35,16 +33,4 @@ namespace Foam
 }
 
 
-// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
-
-Foam::DSMCBaseCloud::DSMCBaseCloud()
-{}
-
-
-// * * * * * * * * * * * * * * * *  Destructor * * * * * * * * * * * * * * * //
-
-Foam::DSMCBaseCloud::~DSMCBaseCloud()
-{}
-
-
 // ************************************************************************* //

src/lagrangian/DSMC/clouds/baseClasses/DSMCBaseCloud/DSMCBaseCloud.H

@@ -2,10 +2,8 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           |
+    \\  /    A nd           | Copyright (C) 2011-2019 OpenCFD Ltd.
      \\/     M anipulation  |
--------------------------------------------------------------------------------
-                            | Copyright (C) 2011-2015 OpenFOAM Foundation
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -50,27 +48,19 @@ namespace Foam
 
 class DSMCBaseCloud
 {
-    // Private Member Functions
-
-        //- No copy construct
-        DSMCBaseCloud(const DSMCBaseCloud&) = delete;
-
-        //- No copy assignment
-        void operator=(const DSMCBaseCloud&) = delete;
-
-
 public:
 
     //- Runtime type information
     TypeName("DSMCBaseCloud");
 
+
     // Constructors
 
         //- Null constructor
-        DSMCBaseCloud();
+        DSMCBaseCloud() = default;
 
     //- Destructor
-    virtual ~DSMCBaseCloud();
+    virtual ~DSMCBaseCloud() = default;
 };
 
 

src/lagrangian/basic/indexedParticle/indexedParticleCloud.H

@@ -2,10 +2,8 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           |
+    \\  /    A nd           | Copyright (C) 2004-2019 OpenCFD Ltd.
      \\/     M anipulation  |
--------------------------------------------------------------------------------
-                            | Copyright (C) 2011 OpenFOAM Foundation
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -67,10 +65,10 @@ public:
     // Constructors
 
         //- Construct given mesh
-        indexedParticleCloud
+        explicit indexedParticleCloud
         (
-            const polyMesh&,
+            const polyMesh& mesh,
-            const word& cloudName = "defaultCloud",
+            const word& cloudName = cloud::defaultName,
             bool readFields = true
         );
 };

src/lagrangian/basic/injectedParticle/injectedParticle.H

@@ -51,15 +51,9 @@ SeeAlso
 namespace Foam
 {
 
+// Forward declarations
 class injectedParticle;
-
+Ostream& operator<<(Ostream&, const injectedParticle&);
-// Forward declaration of friend functions
-
-Ostream& operator<<
-(
-    Ostream&,
-    const injectedParticle&
-);
 
 /*---------------------------------------------------------------------------*\
                          Class injectedParticle Declaration
@@ -210,10 +204,10 @@ public:
 
         // I-O
 
-            //- Read
+            //- Read fields
             static void readFields(Cloud<injectedParticle>& c);
 
-            //- Write
+            //- Write fields
             static void writeFields(const Cloud<injectedParticle>& c);
 
             //- Write particle fields as objects into the obr registry

src/lagrangian/basic/passiveParticle/passiveParticleCloud.H

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           |
+    \\  /    A nd           | Copyright (C) 2019 OpenCFD Ltd.
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
                             | Copyright (C) 2011 OpenFOAM Foundation
@@ -67,10 +67,10 @@ public:
     // Constructors
 
         //- Construct given mesh
-        passiveParticleCloud
+        explicit passiveParticleCloud
         (
-            const polyMesh&,
+            const polyMesh& mesh,
-            const word& cloudName = "defaultCloud",
+            const word& cloudName = cloud::defaultName,
             bool readFields = true
         );
 

src/lagrangian/intermediate/clouds/baseClasses/kinematicCloud/kinematicCloud.C

@@ -2,10 +2,8 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           |
+    \\  /    A nd           | Copyright (C) 2008-2019 OpenCFD Ltd.
      \\/     M anipulation  |
--------------------------------------------------------------------------------
-                            | Copyright (C) 2011-2015 OpenFOAM Foundation
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -35,16 +33,4 @@ namespace Foam
 }
 
 
-// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
-
-Foam::kinematicCloud::kinematicCloud()
-{}
-
-
-// * * * * * * * * * * * * * * * *  Destructor   * * * * * * * * * * * * * * //
-
-Foam::kinematicCloud::~kinematicCloud()
-{}
-
-
 // ************************************************************************* //

src/lagrangian/intermediate/clouds/baseClasses/kinematicCloud/kinematicCloud.H

@@ -2,10 +2,8 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           |
+    \\  /    A nd           | Copyright (C) 2008-2019 OpenCFD Ltd.
      \\/     M anipulation  |
--------------------------------------------------------------------------------
-                            | Copyright (C) 2011-2016 OpenFOAM Foundation
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -51,15 +49,6 @@ namespace Foam
 
 class kinematicCloud
 {
-    // Private Member Functions
-
-        //- No copy construct
-        kinematicCloud(const kinematicCloud&) = delete;
-
-        //- No copy assignment
-        void operator=(const kinematicCloud&) = delete;
-
-
 public:
 
     //- Runtime type information
@@ -69,13 +58,14 @@ public:
     // Constructors
 
         //- Null constructor
-        kinematicCloud();
+        kinematicCloud() = default;
+
 
     //- Destructor
-    virtual ~kinematicCloud();
+    virtual ~kinematicCloud() = default;
 
 
-    // Member functions
+    // Member Functions
 
         // Check
 

src/lagrangian/intermediate/clouds/baseClasses/reactingCloud/reactingCloud.C

@@ -2,10 +2,8 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           |
+    \\  /    A nd           | Copyright (C) 2008-2019 OpenCFD Ltd.
      \\/     M anipulation  |
--------------------------------------------------------------------------------
-                            | Copyright (C) 2011-2015 OpenFOAM Foundation
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -35,16 +33,4 @@ namespace Foam
 }
 
 
-// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
-
-Foam::reactingCloud::reactingCloud()
-{}
-
-
-// * * * * * * * * * * * * * * * *  Destructor   * * * * * * * * * * * * * * //
-
-Foam::reactingCloud::~reactingCloud()
-{}
-
-
 // ************************************************************************* //

src/lagrangian/intermediate/clouds/baseClasses/reactingCloud/reactingCloud.H

@@ -2,10 +2,8 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           |
+    \\  /    A nd           | Copyright (C) 2008-2019 OpenCFD Ltd.
      \\/     M anipulation  |
--------------------------------------------------------------------------------
-                            | Copyright (C) 2011 OpenFOAM Foundation
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -50,28 +48,20 @@ namespace Foam
 
 class reactingCloud
 {
-    // Private Member Functions
-
-        //- No copy construct
-        reactingCloud(const reactingCloud&) = delete;
-
-        //- No copy assignment
-        void operator=(const reactingCloud&) = delete;
-
-
 public:
 
     //- Runtime type information
     TypeName("reactingCloud");
 
+
     // Constructors
 
         //- Null constructor
-        reactingCloud();
+        reactingCloud() = default;
 
 
     //- Destructor
-    virtual ~reactingCloud();
+    virtual ~reactingCloud() = default;
 };
 
 

src/lagrangian/intermediate/clouds/baseClasses/reactingMultiphaseCloud/reactingMultiphaseCloud.C

@@ -2,10 +2,8 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           |
+    \\  /    A nd           | Copyright (C) 2009-2019 OpenCFD Ltd.
      \\/     M anipulation  |
--------------------------------------------------------------------------------
-                            | Copyright (C) 2011-2015 OpenFOAM Foundation
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -35,16 +33,4 @@ namespace Foam
 }
 
 
-// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
-
-Foam::reactingMultiphaseCloud::reactingMultiphaseCloud()
-{}
-
-
-// * * * * * * * * * * * * * * * *  Destructor   * * * * * * * * * * * * * * //
-
-Foam::reactingMultiphaseCloud::~reactingMultiphaseCloud()
-{}
-
-
 // ************************************************************************* //

src/lagrangian/intermediate/clouds/baseClasses/reactingMultiphaseCloud/reactingMultiphaseCloud.H

@@ -50,28 +50,20 @@ namespace Foam
 
 class reactingMultiphaseCloud
 {
-    // Private Member Functions
-
-        //- No copy construct
-        reactingMultiphaseCloud(const reactingMultiphaseCloud&) = delete;
-
-        //- No copy assignment
-        void operator=(const reactingMultiphaseCloud&) = delete;
-
-
 public:
 
     //- Runtime type information
     TypeName("reactingMultiphaseCloud");
 
+
     // Constructors
 
         //- Null constructor
-        reactingMultiphaseCloud();
+        reactingMultiphaseCloud() = default;
 
 
     //- Destructor
-    virtual ~reactingMultiphaseCloud();
+    virtual ~reactingMultiphaseCloud() = default;
 };
 
 

src/lagrangian/intermediate/clouds/baseClasses/thermoCloud/thermoCloud.C

@@ -2,10 +2,8 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           |
+    \\  /    A nd           | Copyright (C) 2008-2019 OpenCFD Ltd.
      \\/     M anipulation  |
--------------------------------------------------------------------------------
-                            | Copyright (C) 2011-2015 OpenFOAM Foundation
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -35,16 +33,4 @@ namespace Foam
 }
 
 
-// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
-
-Foam::thermoCloud::thermoCloud()
-{}
-
-
-// * * * * * * * * * * * * * * * *  Destructor   * * * * * * * * * * * * * * //
-
-Foam::thermoCloud::~thermoCloud()
-{}
-
-
 // ************************************************************************* //

src/lagrangian/intermediate/clouds/baseClasses/thermoCloud/thermoCloud.H

@@ -2,10 +2,8 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           |
+    \\  /    A nd           | Copyright (C) 2008-2019 OpenCFD Ltd.
      \\/     M anipulation  |
--------------------------------------------------------------------------------
-                            | Copyright (C) 2011 OpenFOAM Foundation
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -50,28 +48,20 @@ namespace Foam
 
 class thermoCloud
 {
-    // Private Member Functions
-
-        //- No copy construct
-        thermoCloud(const thermoCloud&) = delete;
-
-        //- No copy assignment
-        void operator=(const thermoCloud&) = delete;
-
-
 public:
 
     //- Runtime type information
     TypeName("thermoCloud");
 
+
     // Constructors
 
         //- Null constructor
-        thermoCloud();
+        thermoCloud() = default;
 
 
     //- Destructor
-    virtual ~thermoCloud();
+    virtual ~thermoCloud() = default;
 
 
     // Member Functions

src/lagrangian/intermediate/clouds/derived/basicKinematicCloud/basicKinematicCloud.H

@@ -4,8 +4,6 @@
    \\    /   O peration     |
     \\  /    A nd           |
      \\/     M anipulation  |
--------------------------------------------------------------------------------
-                            | Copyright (C) 2011-2016 OpenFOAM Foundation
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -42,7 +40,13 @@ Description
 
 namespace Foam
 {
-    typedef KinematicCloud<Cloud<basicKinematicParcel>> basicKinematicCloud;
+    typedef KinematicCloud
+    <
+        Cloud
+        <
+            basicKinematicParcel
+        >
+    > basicKinematicCloud;
 }
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

src/lagrangian/intermediate/clouds/derived/basicKinematicCollidingCloud/basicKinematicCollidingCloud.H

@@ -2,10 +2,8 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           |
+    \\  /    A nd           | Copyright (C) 2011 OpenCFD Ltd.
      \\/     M anipulation  |
--------------------------------------------------------------------------------
-                            | Copyright (C) 2011 OpenFOAM Foundation
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.

src/lagrangian/intermediate/clouds/derived/basicKinematicMPPICCloud/basicKinematicMPPICCloud.H

@@ -2,10 +2,8 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           |
+    \\  /    A nd           | Copyright (C) 2013 OpenCFD Ltd.
      \\/     M anipulation  |
--------------------------------------------------------------------------------
-                            | Copyright (C) 2013 OpenFOAM Foundation
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.

src/lagrangian/intermediate/clouds/derived/basicReactingCloud/basicReactingCloud.H

@@ -4,8 +4,6 @@
    \\    /   O peration     |
     \\  /    A nd           |
      \\/     M anipulation  |
--------------------------------------------------------------------------------
-                            | Copyright (C) 2011 OpenFOAM Foundation
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.

src/lagrangian/intermediate/clouds/derived/basicReactingMultiphaseCloud/basicReactingMultiphaseCloud.H

@@ -4,8 +4,6 @@
    \\    /   O peration     |
     \\  /    A nd           |
      \\/     M anipulation  |
--------------------------------------------------------------------------------
-                            | Copyright (C) 2011 OpenFOAM Foundation
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.

src/lagrangian/solidParticle/solidParticleCloud.H

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           |
+    \\  /    A nd           | Copyright (C) 2019 OpenCFD Ltd.
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
                             | Copyright (C) 2011-2017 OpenFOAM Foundation
@@ -48,7 +48,7 @@ SourceFiles
 namespace Foam
 {
 
-// Forward declaration of classes
+// Forward Declarations
 class fvMesh;
 
 /*---------------------------------------------------------------------------*\
@@ -84,10 +84,10 @@ public:
     // Constructors
 
         //- Construct given mesh
-        solidParticleCloud
+        explicit solidParticleCloud
         (
-            const fvMesh&,
+            const fvMesh& mesh,
-            const word& cloudName = "defaultCloud",
+            const word& cloudName = cloud::defaultName,
             bool readFields = true
         );
 

src/lagrangian/spray/clouds/Templates/SprayCloud/SprayCloud.H

@@ -45,12 +45,11 @@ Description
 namespace Foam
 {
 
-// Forward declaration of classes
+// Forward Declarations
-template<class CloudType>
+template<class CloudType> class AtomizationModel;
-class AtomizationModel;
+template<class CloudType> class BreakupModel;
+template<class CloudType> class SprayCloud;
 
-template<class CloudType>
-class BreakupModel;
 
 /*---------------------------------------------------------------------------*\
                       Class SprayCloud Declaration

src/lagrangian/spray/clouds/baseClasses/sprayCloud/sprayCloud.C

@@ -2,10 +2,8 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           |
+    \\  /    A nd           | Copyright (C) 2011-2019 OpenCFD Ltd.
      \\/     M anipulation  |
--------------------------------------------------------------------------------
-                            | Copyright (C) 2011-2015 OpenFOAM Foundation
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -35,16 +33,4 @@ namespace Foam
 }
 
 
-// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
-
-Foam::sprayCloud::sprayCloud()
-{}
-
-
-// * * * * * * * * * * * * * * * *  Destructor   * * * * * * * * * * * * * * //
-
-Foam::sprayCloud::~sprayCloud()
-{}
-
-
 // ************************************************************************* //

src/lagrangian/spray/clouds/baseClasses/sprayCloud/sprayCloud.H

@@ -2,10 +2,8 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           |
+    \\  /    A nd           | Copyright (C) 2011-2019 OpenCFD Ltd.
      \\/     M anipulation  |
--------------------------------------------------------------------------------
-                            | Copyright (C) 2011 OpenFOAM Foundation
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -50,15 +48,6 @@ namespace Foam
 
 class sprayCloud
 {
-    // Private Member Functions
-
-        //- No copy construct
-        sprayCloud(const sprayCloud&) = delete;
-
-        //- No copy assignment
-        void operator=(const sprayCloud&) = delete;
-
-
 public:
 
     //- Runtime type information
@@ -67,11 +56,11 @@ public:
     // Constructors
 
         //- Null constructor
-        sprayCloud();
+        sprayCloud() = default;
 
 
     //- Destructor
-    virtual ~sprayCloud();
+    virtual ~sprayCloud() = default;
 };