#include <deal.II/base/parameter_handler.h>

Inheritance diagram for MultipleParameterLoop:

Classes
class	Entry

class	UserClass

Public Types
enum	OutputStyle { DefaultStyle = 0x0000 , Short = 0x0001 , KeepDeclarationOrder = 0x0002 , PRM = 0x0010 , Text = PRM , LaTeX = 0x0020 , Description = 0x0040 , XML = 0x0080 , JSON = 0x0100 , ShortPRM = PRM \| Short , ShortText = ShortPRM , ShortXML = XML \| Short , ShortJSON = JSON \| Short , ShortLaTeX = LaTeX \| Short }

using	ExcInvalidEntryForPatternXML = ExcValueDoesNotMatchPattern

Public Member Functions
	MultipleParameterLoop ()

virtual	~MultipleParameterLoop () override=default

virtual void	parse_input (std::istream &input, const std::string &filename="input file", const std::string &last_line="", const bool skip_undefined=false) override

void	loop (UserClass &uc)

std::size_t	memory_consumption () const

virtual void	parse_input (std::istream &input, const std::string &filename="input file", const std::string &last_line="", const bool skip_undefined=false)

virtual void	parse_input (const std::string &filename, const std::string &last_line="", const bool skip_undefined=false, const bool assert_mandatory_entries_are_found=false)

virtual void	parse_input_from_string (const std::string &s, const std::string &last_line="", const bool skip_undefined=false)

virtual void	parse_input_from_xml (std::istream &input, const bool skip_undefined=false)

virtual void	parse_input_from_json (std::istream &input, const bool skip_undefined=false)

void	clear ()

void	declare_entry (const std::string &entry, const std::string &default_value, const Patterns::PatternBase &pattern=Patterns::Anything(), const std::string &documentation="", const bool has_to_be_set=false)

void	add_action (const std::string &entry, const std::function< void(const std::string &value)> &action)

template<class ParameterType >
void	add_parameter (const std::string &entry, ParameterType &parameter, const std::string &documentation="", const Patterns::PatternBase &pattern= *Patterns::Tools::Convert< ParameterType >::to_pattern(), const bool has_to_be_set=false)

void	declare_alias (const std::string &existing_entry_name, const std::string &alias_name, const bool alias_is_deprecated=false)

void	enter_subsection (const std::string &subsection)

void	leave_subsection ()

bool	subsection_path_exists (const std::vector< std::string > &sub_path) const

std::string	get (const std::string &entry_string) const

std::string	get (const std::vector< std::string > &entry_subsection_path, const std::string &entry_string) const

long int	get_integer (const std::string &entry_string) const

long int	get_integer (const std::vector< std::string > &entry_subsection_path, const std::string &entry_string) const

double	get_double (const std::string &entry_name) const

double	get_double (const std::vector< std::string > &entry_subsection_path, const std::string &entry_string) const

bool	get_bool (const std::string &entry_name) const

bool	get_bool (const std::vector< std::string > &entry_subsection_path, const std::string &entry_string) const

void	set (const std::string &entry_name, const std::string &new_value)

void	set (const std::string &entry_name, const char *new_value)

void	set (const std::string &entry_name, const long int new_value)

void	set (const std::string &entry_name, const double new_value)

void	set (const std::string &entry_name, const bool new_value)

std::ostream &	print_parameters (std::ostream &out, const OutputStyle style) const

void	print_parameters (const std::string &filename, const OutputStyle style=DefaultStyle) const

void	log_parameters (LogStream &out, const OutputStyle style=DefaultStyle)

void	log_parameters_section (LogStream &out, const OutputStyle style=DefaultStyle)

template<class Archive >
void	save (Archive &ar, const unsigned int version) const

template<class Archive >
void	load (Archive &ar, const unsigned int version)

template<class Archive >
void	serialize (Archive &archive, const unsigned int version)

bool	operator== (const ParameterHandler &prm2) const

std::set< std::string >	get_entries_wrongly_not_set () const

void	assert_that_entries_have_been_set () const

Static Public Member Functions
static ::ExceptionBase &	ExcEntryAlreadyExists (std::string arg1)

static ::ExceptionBase &	ExcValueDoesNotMatchPattern (std::string arg1, std::string arg2)

static ::ExceptionBase &	ExcAlreadyAtTopLevel ()

static ::ExceptionBase &	ExcEntryUndeclared (std::string arg1)

static ::ExceptionBase &	ExcUnbalancedSubsections (std::string arg1, std::string arg2)

static ::ExceptionBase &	ExcNoSubsection (int arg1, std::string arg2, std::string arg3)

static ::ExceptionBase &	ExcCannotParseLine (int arg1, std::string arg2, std::string arg3)

static ::ExceptionBase &	ExcInvalidEntryForPattern (int arg1, std::string arg2, std::string arg3, std::string arg4, std::string arg5)

static ::ExceptionBase &	ExcInvalidXMLParameterFile ()

static ::ExceptionBase &	ExcCannotOpenIncludeStatementFile (int arg1, std::string arg2, std::string arg3)

Private Member Functions
void	init_branches ()

void	init_branches_current_section ()

void	fill_entry_values (const unsigned int run_no)

std::string	get_current_path () const

std::string	get_current_full_path (const std::string &name) const

std::string	get_current_full_path (const std::vector< std::string > &sub_path, const std::string &name) const

void	scan_line (std::string line, const std::string &input_filename, const unsigned int current_line_n, const bool skip_undefined)

void	recursively_print_parameters (const boost::property_tree::ptree &tree, const std::vector< std::string > &target_subsection_path, const ParameterHandler::OutputStyle style, const unsigned int indent_level, std::ostream &out) const

Private Attributes
std::vector< Entry >	multiple_choices

unsigned int	n_branches

std::vector< std::string >	subsection_path

std::unique_ptr< boost::property_tree::ptree >	entries

std::map< std::string, std::pair< bool, bool > >	entries_set_status

std::vector< std::unique_ptr< const Patterns::PatternBase > >	patterns

std::vector< std::function< void(const std::string &)> >	actions

Static Private Attributes
static const char	path_separator = '.'

Subscriptor functionality
Classes derived from Subscriptor provide a facility to subscribe to this object. This is mostly used by the SmartPointer class.
std::atomic< unsigned int >	counter

std::map< std::string, unsigned int >	counter_map

std::vector< std::atomic< bool > * >	validity_pointers

const std::type_info *	object_info

void	subscribe (std::atomic< bool > *const validity, const std::string &identifier="") const

void	unsubscribe (std::atomic< bool > *const validity, const std::string &identifier="") const

unsigned int	n_subscriptions () const

template<typename StreamType >
void	list_subscribers (StreamType &stream) const

void	list_subscribers () const

void	check_no_subscribers () const noexcept

static std::mutex	mutex

static ::ExceptionBase &	ExcInUse (int arg1, std::string arg2, std::string arg3)

static ::ExceptionBase &	ExcNoSubscriber (std::string arg1, std::string arg2)

using	map_value_type = decltype(counter_map)::value_type

using	map_iterator = decltype(counter_map)::iterator

Detailed Description

The class MultipleParameterLoop offers an easy possibility to test several parameter sets during one run of the program. For this it uses the ParameterHandler class to read in data in a standardized form, searches for variant entry values and performs a loop over all combinations of parameters.

Variant entry values are given like this:

*     set Time step size = { 0.1 | 0.2 | 0.3 }
*

The loop will then perform three runs of the program, one for each value of Time step size, while all other parameters are as specified or with their default value. If there are several variant entry values in the input, a loop is performed for each combination of variant values:

*     set Time step size = { 0.1 | 0.2 }
*     set Solver         = { CG  | GMRES }
*

will result in four runs of the programs, with time step 0.1 and 0.2 for each of the two solvers.

In addition to variant entries, this class also supports array entries that look like this:

*     set Output file = ofile.{{ 1 | 2 | 3 | 4 }}
*

This indicates that if there are variant entries producing a total of four different runs, then we will write their results to the files ofile.1, ofile.2, ofile.3 and ofile.4, respectively. Array entries do not generate multiple runs of the main loop themselves, but if there are variant entries, then in the nth run of the main loop, also the nth value of an array is returned.

Since the different variants are constructed in the order of declaration, not in the order in which the variant entries appear in the input file, it may be difficult to guess the mapping between the different variants and the appropriate entry in an array. You will have to check the order of declaration, or use only one variant entry.

It is guaranteed that only selections which match the regular expression (pattern) given upon declaration of an entry are given back to the program. If a variant value does not match the regular expression, the default value is stored and an error is issued. Before the first run of the loop, all possible values are checked for their conformance, so that the error is issued at the very beginning of the program.

Usage

The usage of this class is similar to the ParameterHandler class. First the entries and subsections have to be declared, then a loop is performed in which the different parameter sets are set, a new instance of a user class is created which is then called. Taking the classes of the example for the ParameterHandler class, the extended program would look like this:

class HelperClass : public MultipleParameterLoop::UserClass
{
public:
  HelperClass ();
 
  virtual void create_new (const unsigned int run_no);
  virtual void run (ParameterHandler &prm);
 
  static void declare_parameters (ParameterHandler &prm);
private:
  std::unique_ptr<Problem> p;
};
 
 
HelperClass::HelperClass () : p(0) {}
 
 
void HelperClass::create_new (const unsigned int run_no)
{
  p = std::make_unique<Problem>());
}
 
 
void HelperClass::declare_parameters (ParameterHandler &prm)
{
  Problem::declare_parameters (prm);
}
 
 
void HelperClass::run (ParameterHandler &prm)
{
  p->get_parameters (prm);
  p->do_useful_work ();
}
 
 
 
int main ()
{
  class MultipleParameterLoop prm;
  HelperClass h;
  HelperClass::declare_parameters (prm);
  prm.parse_input ("prmtest.prm");
  prm.loop (h);
  return 0;
}

As can be seen, first a new helper class has to be set up. This must contain a virtual constructor for a problem class. You can also derive your problem class from MultipleParameterLoop::UserClass and let create_new clear all member variables. If you have access to all inherited member variables in some way this is the recommended procedure. A third possibility is to use multiple inheritance and derive a helper class from both the MultipleParameterLoop::UserClass and the problem class. In any case, create_new has to provide a clean problem object which is the problem in the second and third possibility.

The derived class also has to provide for member functions which declare the entries and which run the program. Running the program includes getting the parameters out of the ParameterHandler object.

After defining an object of this helper class and an object of the MultipleParameterLoop class, the entries have to be declared in the same way as for the ParameterHandler class. Then the input has to be read. Finally the loop is called. This executes the following steps:

for (each combination)
  {
    UserObject.create_new (run_no);
 
    // set parameters for this run
 
    UserObject.run (*this);
  }

UserObject is the parameter to the loop function. create_new is given the number of the run (starting from one) to enable naming output files differently for each run.

Syntax for variant and array entry values

Variant values are specified like prefix{ v1 | v2 | v3 | ... }postfix. Whitespace to the right of the opening brace { is ignored as well as to the left of the closing brace } while whitespace on the respectively other side is not ignored. Whitespace around the mid symbols | is also ignored. The empty selection prefix{ v1 | }postfix is also allowed and produces the strings prefixv1postfix and prefixpostfix.

The syntax for array values is equal, apart from the double braces: prefix{{ v1 | v2 | v3 }}postfix.

Worked example

Given the above extensions to the example program for the ParameterHandler and the following input file

*     set Equation 1 = Poisson
*     set Equation 2 = Navier-Stokes
*     set Output file= results.{{ 1 | 2 | 3 | 4 | 5 | 6 }}
*
*     subsection Equation 1
*       set Matrix type = Sparse
*       subsection Linear solver
*         set Solver                       = CG
*         set Maximum number of iterations = { 10 | 20 | 30 }
*       end
*     end
*
*     subsection Equation 2
*       set Matrix type = Full
*       subsection Linear solver
*         set Solver                       = { BiCGStab | GMRES }
*         set Maximum number of iterations = 100
*       end
*     end
*

this is the output:

*     LinEq: Method=CG, MaxIterations=10
*     LinEq: Method=BiCGStab, MaxIterations=100
*     Problem: outfile=results.1
*              eq1=Poisson, eq2=Navier-Stokes
*              Matrix1=Sparse, Matrix2=Full
*     LinEq: Method=CG, MaxIterations=20
*     LinEq: Method=BiCGStab, MaxIterations=100
*     Problem: outfile=results.2
*              eq1=Poisson, eq2=Navier-Stokes
*              Matrix1=Sparse, Matrix2=Full
*     LinEq: Method=CG, MaxIterations=30
*     LinEq: Method=BiCGStab, MaxIterations=100
*     Problem: outfile=results.3
*              eq1=Poisson, eq2=Navier-Stokes
*              Matrix1=Sparse, Matrix2=Full
*     LinEq: Method=CG, MaxIterations=10
*     LinEq: Method=GMRES, MaxIterations=100
*     Problem: outfile=results.4
*              eq1=Poisson, eq2=Navier-Stokes
*              Matrix1=Sparse, Matrix2=Full
*     LinEq: Method=CG, MaxIterations=20
*     LinEq: Method=GMRES, MaxIterations=100
*     Problem: outfile=results.5
*              eq1=Poisson, eq2=Navier-Stokes
*              Matrix1=Sparse, Matrix2=Full
*     LinEq: Method=CG, MaxIterations=30
*     LinEq: Method=GMRES, MaxIterations=100
*     Problem: outfile=results.6
*              eq1=Poisson, eq2=Navier-Stokes
*              Matrix1=Sparse, Matrix2=Full
*

Since create_new gets the number of the run it would also be possible to output the number of the run.

Definition at line 2080 of file parameter_handler.h.

Member Enumeration Documentation

◆ OutputStyle

enum ParameterHandler::OutputStyle

inherited

List of possible output formats used for functions like ParameterHandler::print_parameters(). The options can be categorized into two groups:

format options: PRM, LaTeX, Description, XML, JSON
stylistic options: Short, KeepDeclarationOrder

Only one format option may be specified at the time. Any function that accepts an OutputStyle as an option will throw if you specify more than one.

A number of shortcuts of commonly used option combinations are provided. E.g., ShortPRM prints the parameters in the PRM format, while skipping the documentation.

Enumerator
DefaultStyle	Default stylistic style: print documentation and sort all parameters alphabetically.
Short	Write input for ParameterHandler without comments or changed default values.
KeepDeclarationOrder	Keep the order of the parameters as they have been declared.
PRM	Write human readable output suitable to be read by ParameterHandler::parse_input() again.
Text	Write human readable output suitable to be read by ParameterHandler::parse_input() again. Deprecated: Use `PRM` instead of `Text`.
LaTeX	Write parameters as a LaTeX table.
Description	Write out declared parameters with description and possible values. Note This format is not suitable to be read back again.
XML	Write out everything as an XML file suitable to be read by ParameterHandler::parse_input_from_xml() again. See the general documentation of this class for an example of output.
JSON	Write out everything as a JSON file suitable to be read by ParameterHandler::parse_input_from_json() again.
ShortPRM	Write the content of ParameterHandler without comments or changed default values.
ShortText	Write the content of ParameterHandler without comments or changed default values. Deprecated: Use `ShortPRM` instead of `ShortText`.
ShortXML	Write the content of ParameterHandler without comments or changed default values as a XML file.
ShortJSON	Write the content of ParameterHandler without comments or changed default values as a JSON file.
ShortLaTeX	Write the content of ParameterHandler without comments or changed default values as a LaTeX file.

Definition at line 858 of file parameter_handler.h.

Member Function Documentation

◆ parse_input() [1/2]

void ParameterHandler::parse_input	(	std::istream &	input,
		const std::string &	filename = `"input file"`,
		const std::string &	last_line = `""`,
		const bool	skip_undefined = `false`
	)

virtual

Overriding virtual functions which are overloaded (like ParameterHandler::parse_input, which has two different sets of input argument types) causes the non-overridden functions to be hidden. Get around this by explicitly using both variants of ParameterHandler::parse_input and then overriding the one we care about.

Reimplemented from ParameterHandler.

Definition at line 1012 of file parameter_handler.cc.

◆ parse_input() [2/2]

void ParameterHandler::parse_input	(	const std::string &	filename,
		const std::string &	last_line = `""`,
		const bool	skip_undefined = `false`,
		const bool	assert_mandatory_entries_are_found = `false`
	)

virtual

Overriding virtual functions which are overloaded (like ParameterHandler::parse_input, which has two different sets of input argument types) causes the non-overridden functions to be hidden. Get around this by explicitly using both variants of ParameterHandler::parse_input and then overriding the one we care about.

Reimplemented from ParameterHandler.

Definition at line 1039 of file parameter_handler.cc.

◆ parse_input_from_string()

void ParameterHandler::parse_input_from_string	(	const std::string &	s,
		const std::string &	last_line = `""`,
		const bool	skip_undefined = `false`
	)

virtualinherited

Parse input from a string to populate known parameter fields. The lines in the string must be separated by \n characters.

The function in essence reads the entire file into a stream and then calls the other parse_input() function with that stream. See there for more information.

Definition at line 560 of file parameter_handler.cc.

◆ parse_input_from_xml()

void ParameterHandler::parse_input_from_xml	(	std::istream &	input,
		const bool	skip_undefined = `false`
	)

virtualinherited

Parse input from an XML stream to populate known parameter fields. This could be from a file originally written by the print_parameters() function using the XML output style and then modified by hand as necessary, or from a file written using this method and then modified by the graphical parameter GUI (see the general documentation of this class).

Definition at line 700 of file parameter_handler.cc.

◆ parse_input_from_json()

void ParameterHandler::parse_input_from_json	(	std::istream &	input,
		const bool	skip_undefined = `false`
	)

virtualinherited

Parse input from a JSON stream to populate known parameter fields. This could be from a file originally written by the print_parameters() function using the JSON output style and then modified by hand as necessary, or from a separate program that knows how to write JSON format for ParameterHandler input.

Definition at line 756 of file parameter_handler.cc.

◆ clear()

void ParameterHandler::clear ( )

inherited

Clear all contents.

Definition at line 787 of file parameter_handler.cc.

◆ declare_entry()

void ParameterHandler::declare_entry	(	const std::string &	entry,
		const std::string &	default_value,
		const Patterns::PatternBase &	pattern = `Patterns::Anything()`,
		const std::string &	documentation = `""`,
		const bool	has_to_be_set = `false`
	)

inherited

Declare a new entry with name entry, default and for which any input has to match the pattern (default: any pattern).

The function generates an exception of type ExcValueDoesNotMatchPattern if the default value doesn't match the given pattern, using the C++ throw mechanism. However, this exception is only generated after the entry has been created; if you have code where no sensible default value for a parameter is possible, you can then catch and ignore this exception.

The parameter documentation defaulting to an empty string is used to add a documenting text to each entry which will be printed as a comment when this class is asked to write out all declarations to a stream using the print_parameters() function.

The parameter has_to_be_set can be used in order to declare this parameter as a parameter whose default value has to be overwritten by one of the methods provided by this class. Whether a parameter has been set successfully can be queried by the functions get_entries_wrongly_not_set() and assert_that_entries_have_been_set().

Note: An entry can be declared more than once without generating an error, for example to override an earlier default value.

Definition at line 796 of file parameter_handler.cc.

◆ add_action()

void ParameterHandler::add_action	(	const std::string &	entry,
		const std::function< void(const std::string &value)> &	action
	)

inherited

Attach an action to the parameter with name entry in the current section. The action needs to be a function-like object that takes the value of the parameter as a (string) argument. See the general documentation of this class for a longer description of actions, as well as examples.

The action is executed in three different circumstances:

With the default value of the parameter with name name, at the end of the current function. This is useful because it allows for the action to execute whatever it needs to do at least once for each parameter, even those that are not actually specified in the input file (and thus remain at their default values).
Within the ParameterHandler::set() functions that explicitly set a value for a parameter.
Within the parse_input() function and similar functions such as parse_input_from_string(). Here, the action is executed whenever the parameter with which it is associated is read from the input, after it has been established that the value so read matches the pattern that corresponds to this parameter, and before the value is actually saved.

It is valid to add multiple actions to the same parameter. They will in that case be executed in the same order in which they were added.

Note: Actions may modify all sorts of variables in their scope. The only thing an action should not modify is the ParameterHandler object it is attached to. In other words, it is not allowed to enter or leave sections of the current ParameterHandler object. It is, in principle, acceptable to call ParameterHandler::get() and related functions on other parameters in the current section, but since there is no guarantee about the order in which they will be read from an input file, you will not want to rely on the values these functions would return.; Throwing an exception in an action is generally not a good idea, but yields fundamentally the same result as if one tries to read a parameter from a file for which the value does not satisfy the pattern associated with the parameter. In other words, the value just read is discarded, and ParameterHandler::parse_input() stops to read any further content from the file. See ParameterHandler::parse_input() for more information.

Definition at line 842 of file parameter_handler.cc.

◆ add_parameter()

template<class ParameterType >

void ParameterHandler::add_parameter	(	const std::string &	entry,
		ParameterType &	parameter,
		const std::string &	documentation = `""`,
		const Patterns::PatternBase &	pattern = `*Patterns::Tools::Convert<ParameterType>::to_pattern()`,
		const bool	has_to_be_set = `false`
	)

inherited

Declare a new entry name entry, set its default value to the content of the variable parameter, and create an action that will fill parameter with updated values when a file is parsed, or the entry is set to a new value.

By default, the pattern to use is obtained by calling the function Patterns::Tools::Convert<T>::to_pattern(), but a custom one can be used.

The parameter has_to_be_set can be used in order to declare this parameter as a parameter whose default value has to be overwritten by one of the methods provided by this class. Whether a parameter has been set successfully can be queried by the functions get_entries_wrongly_not_set() and assert_that_entries_have_been_set().

Definition at line 2325 of file parameter_handler.h.

◆ declare_alias()

void ParameterHandler::declare_alias	(	const std::string &	existing_entry_name,
		const std::string &	alias_name,
		const bool	alias_is_deprecated = `false`
	)

inherited

Create an alias for an existing entry. This provides a way to refer to a parameter in the input file using an alternate name. The alias will be in the current section, and the referenced entry needs to be an existing entry in the current section.

The primary purpose of this function is to allow for a backward compatible way of changing names in input files of applications for which backward compatibility is important. This can be achieved by changing the name of the parameter in the call to declare_entry(), and then creating an alias that maps the old name to the new name. This way, old input files can continue to refer to parameters under the old name, and they will automatically be mapped to the new parameter name.

It is valid to set the same parameter multiple times in an input file. The value that will ultimately be chosen in such cases is simply the last value set. This rule also applies to aliases, where the final value of a parameter is the last value set either through the current name of the parameter or through any of its possible multiple aliases. For example, if you have an input file that looks like

set parm1 = 1

set parm1_alias = 2

ParameterHandler::set

void set(const std::string &entry_name, const std::string &new_value)

Definition: parameter_handler.cc:1152

where parm1_alias is an alias declared via

prm.declare_alias ("parm1", "parm1_alias");

then the final value for the parameter called parm1 will be 2, not 1.

Parameters

existing_entry_name	The name of an existing parameter in the current section that the alias should refer to.
alias_name	An alternate name for the parameter referenced by the first argument.
alias_is_deprecated	If true, mark the alias as deprecated. This will then be listed in the description of the alias if you call print_parameters(), and you will get a warning on the screen when reading an input file that contains this deprecated alias. The purpose of this argument is to be able to allow the use of an old name for a parameter (see above) but make it clear that this old name will eventually be removed.

Definition at line 878 of file parameter_handler.cc.

◆ enter_subsection()

void ParameterHandler::enter_subsection ( const std::string & subsection )

inherited

Enter a subsection. If it does not yet exist, create it.

Definition at line 939 of file parameter_handler.cc.

◆ leave_subsection()

void ParameterHandler::leave_subsection ( )

inherited

Leave present subsection.

Definition at line 953 of file parameter_handler.cc.

◆ subsection_path_exists()

bool ParameterHandler::subsection_path_exists ( const std::vector< std::string > & sub_path ) const

inherited

Check whether a subsection or a subsection path exists in current tree. The input parameter sub_path is assumed to be relative to the currently selected path.

Definition at line 966 of file parameter_handler.cc.

◆ get() [1/2]

std::string ParameterHandler::get ( const std::string & entry_string ) const

inherited

Return value of entry entry_string. If the entry was changed, then the changed value is returned, otherwise the default value. If the value of an undeclared entry is required, an Assert will fail.

Definition at line 987 of file parameter_handler.cc.

◆ get() [2/2]

std::string ParameterHandler::get	(	const std::vector< std::string > &	entry_subsection_path,
		const std::string &	entry_string
	)		const

inherited

Return value of entry entry_string. If the entry was changed, then the changed value is returned, otherwise the default value. If the value of an undeclared entry is required, an Assert will fail. If entry_subsection_path is non-empty, the value will be gotten from the subsection represented by that path instead of the current subsection. The first string in entry_subsection_path must be the name of a subsection of the current section, and each next string must be the name of a subsection of the one before it.

Definition at line 1004 of file parameter_handler.cc.

◆ get_integer() [1/2]

long int ParameterHandler::get_integer ( const std::string & entry_string ) const

inherited

Return value of entry entry_string as long int. (A long int is chosen so that even very large unsigned values can be returned by this function).

Definition at line 1025 of file parameter_handler.cc.

◆ get_integer() [2/2]

long int ParameterHandler::get_integer	(	const std::vector< std::string > &	entry_subsection_path,
		const std::string &	entry_string
	)		const

inherited

Return value of entry entry_string as long int. (A long int is chosen so that even very large unsigned values can be returned by this function). If entry_subsection_path is non-empty, the value will be gotten from the subsection represented by that path instead of the current subsection.

Definition at line 1044 of file parameter_handler.cc.

◆ get_double() [1/2]

double ParameterHandler::get_double ( const std::string & entry_name ) const

inherited

Return value of entry entry_name as double.

Definition at line 1068 of file parameter_handler.cc.

◆ get_double() [2/2]

double ParameterHandler::get_double	(	const std::vector< std::string > &	entry_subsection_path,
		const std::string &	entry_string
	)		const

inherited

Return value of entry entry_name as double. If entry_subsection_path is non-empty, the value will be gotten from the subsection represented by that path instead of the current subsection.

Definition at line 1088 of file parameter_handler.cc.

◆ get_bool() [1/2]

bool ParameterHandler::get_bool ( const std::string & entry_name ) const

inherited

Return value of entry entry_name as bool. The entry may be "true" or "yes" for true, "false" or "no" for false respectively.

Definition at line 1113 of file parameter_handler.cc.

◆ get_bool() [2/2]

bool ParameterHandler::get_bool	(	const std::vector< std::string > &	entry_subsection_path,
		const std::string &	entry_string
	)		const

inherited

Return value of entry entry_name as bool. The entry may be "true" or "yes" for true, "false" or "no" for false respectively. If entry_subsection_path is non-empty, the value will be gotten from the subsection represented by that path instead of the current subsection.

Definition at line 1130 of file parameter_handler.cc.

◆ set() [1/5]

void ParameterHandler::set	(	const std::string &	entry_name,
		const std::string &	new_value
	)

inherited

Change the value presently stored for entry_name to the one given in the second argument.

The parameter must already exist in the present subsection.

The function throws an exception of type ExcValueDoesNotMatchPattern if the new value does not conform to the pattern for this entry.

Definition at line 1152 of file parameter_handler.cc.

◆ set() [2/5]

void ParameterHandler::set	(	const std::string &	entry_name,
		const char *	new_value
	)

inherited

Same as above, but an overload where the second argument is a character pointer. This is necessary, since otherwise the call to set("abc","def") will be mapped to the function taking one string and a bool as arguments, which is certainly not what is most often intended.

The function throws an exception of type ExcValueDoesNotMatchPattern if the new value does not conform to the pattern for this entry.

Definition at line 1205 of file parameter_handler.cc.

◆ set() [3/5]

void ParameterHandler::set	(	const std::string &	entry_name,
		const long int	new_value
	)

inherited

Change the value presently stored for entry_name to the one given in the second argument.

The parameter must already exist in the present subsection.

The function throws an exception of type ExcValueDoesNotMatchPattern if the new value does not conform to the pattern for this entry.

Definition at line 1227 of file parameter_handler.cc.

◆ set() [4/5]

void ParameterHandler::set	(	const std::string &	entry_name,
		const double	new_value
	)

inherited

Change the value presently stored for entry_name to the one given in the second argument.

The parameter must already exist in the present subsection.

For internal purposes, the new value needs to be converted to a string. This is done using 16 digits of accuracy, so the set value and the one you can get back out using get_double() may differ in the 16th digit.

The function throws an exception of type ExcValueDoesNotMatchPattern if the new value does not conform to the pattern for this entry.

Definition at line 1213 of file parameter_handler.cc.

◆ set() [5/5]

void ParameterHandler::set	(	const std::string &	entry_name,
		const bool	new_value
	)

inherited

Change the value presently stored for entry_name to the one given in the second argument.

The parameter must already exist in the present subsection.

The function throws an exception of type ExcValueDoesNotMatchPattern if the new value does not conform to the pattern for this entry.

Definition at line 1240 of file parameter_handler.cc.

◆ print_parameters() [1/2]

std::ostream & ParameterHandler::print_parameters	(	std::ostream &	out,
		const OutputStyle	style
	)		const

inherited

Print all parameters with the given style to out.

Before printing, all current parameters and subsections are sorted alphabetically by default. This behavior can be disabled setting the optional parameter style to KeepDeclarationOrder: in this case entries are printed in the same order as they have been declared.

In PRM, XML, and JSON format, the output is formatted in such a way that it is possible to use it for later input again. This is most useful to record the parameters for a specific run, since if you output the parameters using this function into a log file, you can always recover the results by simply copying the output to your input file.

Besides the name and value of each entry, the output also contains the default value of entries if it is different from the actual value, as well as the documenting string given to the declare_entry() function if available.

By using the flag Short in combination with PRM, XML, JSON, or LaTeX (or by using the shortcuts ShortPRM, ShortXML, ShortJSON, or ShortLaTeX), a reduced output can be generated, only containing the values and skipping the documentation.

In XML format, the output starts with one root element ParameterHandler in order to get a valid XML document and all subsections under it.

In LaTeX format, the output contains the same information but in a format so that the resulting file can be input into a latex document such as a manual for the code for which this object handles run-time parameters. The various sections of parameters are then represented by latex section and subsection commands as well as by nested enumerations.

You can reference specific parameter sections and individual parameters by the labels that are generated automatically for each entry. The labels have the format parameters:section1/subsection1 and parameters:section1/subsection1/someentry. Because special characters can appear in the section and entry names, these will be "mangled". Here, all characters except [a-zA-Z0-9] are replaced by _XX, where XX is the two-digit ascii code of the character in hexadecimal encoding (so a space becomes _20 for example).

While this function escapes special LaTeX-specific characters (backslash, underscore, etc.) in most of the output (names, default values, etc.), the documentation string is passed as-is. This means you can use math environments and other formatting in the description, but you need to escape quotes, backslashes, underscores, etc. yourself.

In addition, all parameter names are listed with \index statements in two indices called prmindex (where the name of each parameter is listed in the index) and prmindexfull where parameter names are listed sorted by the section in which they exist. By default, the LaTeX program ignores these \index commands, but they can be used to generate an index by using the following commands in the preamble of the latex file :

\usepackage{imakeidx}
\makeindex[name=prmindex, title=Index of run-time parameter entries]
\makeindex[name=prmindexfull,
           title=Index of run-time parameters with section names]

and at the end of the file this:

\printindex[prmindex]

\printindex[prmindexfull]

Definition at line 1250 of file parameter_handler.cc.

◆ print_parameters() [2/2]

void ParameterHandler::print_parameters	(	const std::string &	filename,
		const OutputStyle	style = `DefaultStyle`
	)		const

inherited

Print all parameters to the file given by filename with the given output style style.

This function deduces the output format from the extension of the specified filename. Supported extensions are prm, xml, tex, and json. Hence, it is not necessary to specify an output format via the style argument as long as one of these extensions is added to the filename. If an output format is specified in the style parameter nevertheless, the output format has to be consistent with the filename extension.

If no extension is specified or the extension is not supported, the output format is deduced from the style argument.

If neither the extension is supported, nor does the style parameter contain a format specification, an assertion is thrown.

Parameters

filename	The output file name.
style	The style with which output is produced.

Definition at line 1354 of file parameter_handler.cc.

◆ log_parameters()

void ParameterHandler::log_parameters	(	LogStream &	out,
		const OutputStyle	style = `DefaultStyle`
	)

inherited

Print parameters to a logstream. This function allows to print all parameters into a log-file. Sections will be indented in the usual log- file style.

All current parameters and subsections are sorted alphabetically by default. This behavior can be disabled setting the optional parameter style to KeepDeclarationOrder: in this case entries are printed in the same order as they have been declared.

Note: All style settings in style not related to the ordering are ignored.

Definition at line 1757 of file parameter_handler.cc.

◆ log_parameters_section()

void ParameterHandler::log_parameters_section	(	LogStream &	out,
		const OutputStyle	style = `DefaultStyle`
	)

inherited

Log parameters in the present subsection. The subsection is determined by the subsection_path member variable. This variable is controlled by entering and leaving subsections through the enter_subsection() and leave_subsection() functions.

All current parameters and subsections are sorted alphabetically by default. This behavior can be disabled setting the optional parameter style to KeepDeclarationOrder: in this case entries are printed in the same order as they have been declared.

Note: All style settings in style not related to the ordering are ignored.

In most cases, you will not want to use this function directly, but have it called recursively by the previous function.

Definition at line 1768 of file parameter_handler.cc.

◆ save()

template<class Archive >

void ParameterHandler::save	(	Archive &	ar,
		const unsigned int	version
	)		const

inlineinherited

Write the data of this object to a stream for the purpose of serialization using the BOOST serialization library.

Definition at line 2287 of file parameter_handler.h.

◆ load()

template<class Archive >

void ParameterHandler::load	(	Archive &	ar,
		const unsigned int	version
	)

inlineinherited

Read the data of this object from a stream for the purpose of serialization using the BOOST serialization library.

Definition at line 2306 of file parameter_handler.h.

◆ serialize()

template<class Archive >

void ParameterHandler::serialize	(	Archive &	archive,
		const unsigned int	version
	)

inherited

Write and read the data of this object from a stream for the purpose of serialization using the BOOST serialization library.

◆ operator==()

bool ParameterHandler::operator== ( const ParameterHandler & prm2 ) const

inherited

Test for equality.

Definition at line 2018 of file parameter_handler.cc.

◆ get_entries_wrongly_not_set()

std::set< std::string > ParameterHandler::get_entries_wrongly_not_set ( ) const

inherited

Return a set of parameter names (including subsection names) corresponding to those entries of the parameter handler that have not been set by one of the functions parsing parameters from an input file or by an explicit call to one of the set() functions, but that have been declared as mandatory parameters that must be set (through the last argument of the declare_entry() function or add_parameter() function).

Definition at line 2043 of file parameter_handler.cc.

◆ assert_that_entries_have_been_set()

void ParameterHandler::assert_that_entries_have_been_set ( ) const

inherited

Asserts that those entries of the parameter handler with flag has_to_be_set = true have been set. An exception is invoked if at least one of these parameters has not been set.

Definition at line 2057 of file parameter_handler.cc.

The documentation for this class was generated from the following files:

include/deal.II/base/parameter_handler.h
source/base/parameter_handler.cc

Classes

Public Types

Public Member Functions

Static Public Member Functions

Private Member Functions

Private Attributes

Static Private Attributes

Subscriptor functionality

Detailed Description

Usage

Syntax for variant and array entry values

Worked example

Member Enumeration Documentation

◆ OutputStyle

Member Function Documentation

◆ parse_input() [1/2]

◆ parse_input() [2/2]

◆ parse_input_from_string()

◆ parse_input_from_xml()

◆ parse_input_from_json()

◆ clear()

◆ declare_entry()

◆ add_action()

◆ add_parameter()

◆ declare_alias()

◆ enter_subsection()

◆ leave_subsection()

◆ subsection_path_exists()

◆ get() [1/2]

◆ get() [2/2]

◆ get_integer() [1/2]

◆ get_integer() [2/2]

◆ get_double() [1/2]

◆ get_double() [2/2]

◆ get_bool() [1/2]

◆ get_bool() [2/2]

◆ set() [1/5]

◆ set() [2/5]

◆ set() [3/5]

◆ set() [4/5]

◆ set() [5/5]

◆ print_parameters() [1/2]

◆ print_parameters() [2/2]

◆ log_parameters()

◆ log_parameters_section()

◆ save()

◆ load()

◆ serialize()

◆ operator==()

◆ get_entries_wrongly_not_set()

◆ assert_that_entries_have_been_set()