File.h

Note

The documentation on this page was automatically extracted from the DOLFIN C++ code and may need to be edited or expanded.

class File

A File represents a data file for reading and writing objects. Unless specified explicitly, the format is determined by the file name suffix. A list of objects that can be read/written to file can be found in GenericFile.h. Compatible file formats include:

• Binary (.bin)
• RAW (.raw)
• SVG (.svg)
• XD3 (.xd3)
• XDMF (.xdmf)
• XML (.xml)
• XYZ (.xyz)
• VTK (.pvd)

enum Type

File formats

File(const std::string filename, std::string encoding="ascii")

Create a file with given name

Arguments

filename (std::string)

Name of file.

encoding (std::string)

Optional argument specifying encoding, ASCII is default.

Example

// Save solution to file
File file("solution.pvd");
file << u;

// Read mesh data from file
File mesh_file("mesh.xml");
mesh_file >> mesh;

// Using compressed binary format
File comp_file("solution.pvd", "compressed");

File(MPI_Comm comm, const std::string filename, std::string encoding="ascii")

Create a file with given name with MPI communicator

Arguments

communicator (MPI_Comm)

The MPI communicator.

filename (std::string)

Name of file.

encoding (std::string)

Optional argument specifying encoding, ascii is default.

Example

// Save solution to file
File file(u.mesh()->mpi_comm(), "solution.pvd");
file << u;

// Read mesh data from file
File mesh_file(MPI_COMM_WORLD, "mesh.xml");
mesh_file >> mesh;

// Using compressed binary format
File comp_file(u.mesh()->mpi_comm(), "solution.pvd",
               "compressed");

File(const std::string filename, Type type, std::string encoding="ascii")

Create a file with given name and type (format)

Arguments

filename (std::string)

Name of file.

type (Type)

File format.

encoding (std::string)

Optional argument specifying encoding, ascii is default.

Example

File file("solution", vtk);

File(MPI_Comm comm, const std::string filename, Type type, std::string encoding="ascii")

Create a file with given name and type (format) with MPI communicator

Arguments

communicator (MPI_Comm)

The MPI communicator.

filename (std::string)

Name of file.

type (Type)

File format.

encoding (std::string)

Optional argument specifying encoding, ascii is default.

Example

File file(MPI_COMM_WORLD, "solution", vtk);

File(std::ostream& outstream)

Create an outfile object writing to stream

Arguments

outstream (std::ostream)

The stream.

void operator>>(T& t)

Read from file

void operator<<(const std::pair<const Mesh*, double> mesh)

Write Mesh to file with time

Example

File file("mesh.pvd", "compressed");
file << std::make_pair<const Mesh*, double>(&mesh, t);

void operator<<(const std::pair<const MeshFunction<int>*, double> f)

Write MeshFunction to file with time

Example

File file("markers.pvd", "compressed");
file << std::make_pair<const MeshFunction<int>*, double>(&f, t);

void operator<<(const std::pair<const MeshFunction<std::size_t>*, double> f)

Write MeshFunction to file with time

Example

File file("markers.pvd", "compressed");
file << std::make_pair<const MeshFunction<std::size_t>*, double>(&f, t);

void operator<<(const std::pair<const MeshFunction<double>*, double> f)

Write MeshFunction to file with time

Example

File file("markers.pvd", "compressed");
file << std::make_pair<const MeshFunction<double>*, double>(&f, t);

void operator<<(const std::pair<const MeshFunction<bool>*, double> f)

Write MeshFunction to file with time

Example

File file("markers.pvd", "compressed");
file << std::make_pair<const MeshFunction<bool>*, double>(&f, t);

void operator<<(const std::pair<const Function*, double> u)

Write Function to file with time

Example

File file("solution.pvd", "compressed");
file << std::make_pair<const Function*, double>(&u, t);

void operator<<(const T& t)

Write object to file

static bool exists(std::string filename)

Check if file exists

Arguments

filename (std::string)

Name of file.

Returns

bool

True if the file exists.

static void create_parent_path(std::string filename)

Arguments

filename (std::string)

Name of file / path.