message: Add default value for MeshType
diff: @@ -140,7 +140,8 @@ namespace RINGMesh {
  public:
  virtual ~PointSetMesh() = default;
  - static std::unique_ptr< PointSetMesh > create_mesh( const MeshType type );
  + static std::unique_ptr< PointSetMesh > create_mesh(
  + const MeshType type = "" );
  protected:
  /*!
  * @brief Mesh0D constructor.
  @@ -161,7 +162,8 @@ namespace RINGMesh {
  public:
  virtual ~LineMesh() = default;
  - static std::unique_ptr< LineMesh > create_mesh( const MeshType type );
  + static std::unique_ptr< LineMesh > create_mesh(
  + const MeshType type = "" );
  /*
  * @brief Gets the index of an edge vertex.
  @@ -241,7 +243,8 @@ namespace RINGMesh {
  public:
  virtual ~SurfaceMesh() = default;
  - static std::unique_ptr< SurfaceMesh > create_mesh( const MeshType type );
  + static std::unique_ptr< SurfaceMesh > create_mesh(
  + const MeshType type = "" );
  /*!
  * @brief Gets the vertex index by polygon index and local vertex index.
  @@ -588,7 +591,8 @@ namespace RINGMesh {
  public:
  virtual ~VolumeMesh() = default;
  - static std::unique_ptr< VolumeMesh > create_mesh( const MeshType type );
  + static std::unique_ptr< VolumeMesh > create_mesh(
  + const MeshType type = "" );
  /*!
  * @brief Gets a vertex index by cell and local vertex index.
  