theplu::yat::utility::OptionHelp Class Reference

Class for help option. More...

#include <yat/utility/OptionHelp.h>

Inheritance diagram for theplu::yat::utility::OptionHelp:

Public Member Functions
	OptionHelp (CommandLine &cmd, std::string name="h,help", std::string desc="display this help and exit")
	Constructor. More...
std::string &	post_arguments (void)
std::string &	synopsis (void)
std::string &	usage (void)
bool	value (void) const
	return value
std::string	description (void) const
void	description (const std::string &description)
	set description More...
std::string	long_name (void) const
void	parse (std::vector< std::string >::iterator &, const std::vector< std::string >::iterator &)
	parsing the commandline
bool	present (void) const
	Get if option was found in cmd. More...
std::string	print (void)
	print help output More...
void	reset (void)
	sets present to false
char	short_name (void) const
void	validate (void)
	Validate the Option. More...

Protected Member Functions
const CommandLine &	cmd (void) const

Detailed Description

Class for help option.

When this option is found in parsing of commandline, it displays a help output and exits. A typical output looks like:

Usage: foo [OPTION]...

SYNOPSIS

Available options are:
-h, --help      display this help and exit
-v, --verbose   explain what is being done

Some extra information explaining something.

The output consist of four blocks. The first block can be modified with usage(void) function. The second is block is typically a one-liner explaining the application and can be modified with the synopsis(void) function. The third block contain the description of the different options, see operator<<(std::ostream&, const CommandLine&) for further details. The last block can be modified with post_arguments(void) function.

Constructor & Destructor Documentation

OptionHelp()

theplu::yat::utility::OptionHelp::OptionHelp	(	CommandLine &	cmd,
		std::string	name = "h,help",
		std::string	desc = "display this help and exit"
	)

Constructor.

Parameters

cmd	Commandline Option is associated with
name	string such as "help" for –help, "h" for -h or "h,help" (default) for having both short and long option name
desc	string used in help display

Member Function Documentation

cmd()

const CommandLine& theplu::yat::utility::Option::cmd ( void  ) const

protectedinherited

Returns

const reference to CommandLine Option belongs to.

description() [1/2]

std::string theplu::yat::utility::Option::description ( void  ) const

inherited

Returns

description

description() [2/2]

void theplu::yat::utility::Option::description ( const std::string &  description )

inherited

set description

Since

New in yat 0.7

long_name()

std::string theplu::yat::utility::Option::long_name ( void  ) const

inherited

Returns

long name e.g. 'help' for –help option.

post_arguments()

std::string& theplu::yat::utility::OptionHelp::post_arguments

(

void

)

Text to be displayed after list of arguments.

present()

bool theplu::yat::utility::Option::present ( void  ) const

inherited

Get if option was found in cmd.

Returns

true if option has been detected in parsing

print()

std::string theplu::yat::utility::Option::print ( void  )

inherited

print help output

This function calls the four virtual private functions print1, print2, print3, and print4. This allows an inherited class to implement one (or several) of these functions and keep the default output of the others. The default behavior is that:

• print1 prints the short name, '-h', as short_name(void) const
• print2 prints the long name, '–help', as long_name(void) const
• print3 is empty
• print4 prints the description as description(void) const.

short_name()

char theplu::yat::utility::Option::short_name ( void  ) const

inherited

Returns

short name e.g. 'h' for -h option.

synopsis()

std::string& theplu::yat::utility::OptionHelp::synopsis

(

void

)

Text to be displayed in help output after usage()

usage()

std::string& theplu::yat::utility::OptionHelp::usage

(

void

)

First line to be displayed in help output. Default this string is set to "Usage: <program_name> [OPTION]...\n\n"

validate()

void theplu::yat::utility::Option::validate ( void  )

inherited

Validate the Option.

This function is called by CommandLine::parse() after all options have been detected and parsed (see Option::parse()).

---

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

• yat/utility/OptionHelp.h