VectorSpaces, MatrixSpaces: Allow automatic conversion from zero

src/OpenFOAM/primitives/spatialVectorAlgebra/CompactSpatialTensor/CompactSpatialTensor.H

@@ -72,7 +72,7 @@ public:
         //- Construct null
         inline CompactSpatialTensor();
 
-        inline explicit CompactSpatialTensor(const Foam::zero);
+        inline CompactSpatialTensor(const Foam::zero);
 
         //- Construct given MatrixSpace of the same rank
         inline CompactSpatialTensor

src/OpenFOAM/primitives/spatialVectorAlgebra/CompactSpatialTensorT/CompactSpatialTensorT.H

@@ -71,7 +71,7 @@ public:
         //- Construct null
         inline CompactSpatialTensorT();
 
-        inline explicit CompactSpatialTensorT(const Foam::zero);
+        inline CompactSpatialTensorT(const Foam::zero);
 
         //- Construct given MatrixSpace of the same rank
         inline CompactSpatialTensorT

src/OpenFOAM/primitives/spatialVectorAlgebra/SpatialTensor/SpatialTensor.H

@@ -87,7 +87,7 @@ public:
         inline SpatialTensor();
 
         //- Construct initialized to zero
-        inline explicit SpatialTensor(const Foam::zero);
+        inline SpatialTensor(const Foam::zero);
 
         //- Construct given MatrixSpace of the same rank
         inline SpatialTensor(const typename SpatialTensor::msType&);

src/OpenFOAM/primitives/spatialVectorAlgebra/SpatialVector/SpatialVector.H

@@ -92,7 +92,7 @@ public:
         inline SpatialVector();
 
         //- Construct initialized to zero
-        inline explicit SpatialVector(const Foam::zero);
+        inline SpatialVector(const Foam::zero);
 
         //- Construct given VectorSpace of the same rank
         inline SpatialVector(const typename SpatialVector::vsType&);