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ACE_Arg_Shifter Class Reference

This ADT operates on a specified set of arguments (argv). As known arguments are scanned, they are shifted to the back of the argv vector, so deeper levels of argument parsing can locate the yet unprocessed arguments at the beginning of the vector. More...

#include <Arg_Shifter.h>

List of all members.

Public Methods
	ACE_Arg_Shifter (int &argc, const ACE_TCHAR **argv, const ACE_TCHAR **temp=0)
	ACE_Arg_Shifter (int &argc, ACE_TCHAR **argv, ACE_TCHAR **temp=0)
	~ACE_Arg_Shifter (void)
	Destructor.
const ACE_TCHAR *	get_current (void) const
	Get the current head of the vector.
const ACE_TCHAR *	get_the_parameter (const ACE_TCHAR *flag)
int	cur_arg_strncasecmp (const ACE_TCHAR *flag)
int	consume_arg (int number=1)
int	ignore_arg (int number=1)
int	is_anything_left (void) const
	Returns the number of args left to see in the vector.
int	is_option_next (void) const
int	is_parameter_next (void) const
int	num_ignored_args (void) const
	Returns the number of irrelevant args seen.
Private Methods
	ACE_Arg_Shifter (const ACE_Arg_Shifter &)
	Copy Constructor should not be used.
ACE_Arg_Shifter	operator= (const ACE_Arg_Shifter &)
	Assignment '=' operator should not be used.
void	init (void)
	Refactor the constructor logic.
Private Attributes
int &	argc_
	The size of the argument vector.
int	total_size_
	The size of argv_.
const ACE_TCHAR **	temp_
	The temporary array over which we traverse.
const ACE_TCHAR **	argv_
	The array in which the arguments are reordered.
int	current_index_
	The element in <temp_> we're currently examining.
int	back_
int	front_

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Detailed Description

This ADT operates on a specified set of arguments (argv). As known arguments are scanned, they are shifted to the back of the argv vector, so deeper levels of argument parsing can locate the yet unprocessed arguments at the beginning of the vector.

The ACE_Arg_Shifter copies the pointers of the argv vector into a temporary array. As the ACE_Arg_Shifter iterates over the copied vector, it places known arguments in the rear of the vector, leaving the unknown ones in the beginning. So, after having visited all the arguments in the temporary vector, ACE_Arg_Shifter has placed all the unknown arguments in their original order at the front of original argv.

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Constructor & Destructor Documentation

ACE_Arg_Shifter::ACE_Arg_Shifter (  int &    argc, const ACE_TCHAR **    argv, const ACE_TCHAR **    temp = 0 )

Initialize the ACE_Arg_Shifter to the vector over which to iterate. Optionally, also provide the temporary array for use in shifting the arguments. If ACE_Arg_Shifter must allocate the temporary vector internally and dynamic allocation fails, the ACE_Arg_Shifter will set all indicators to end of the vector, forbidding iteration. Following iteration over argv, the argc value will be updated to contain the number of unconsumed arguments. Parameters: argc  The number of strings in argv. argc will be updated to reflect the number of unconsumed arguments. argv  The argument vector to shift. The string pointers in the vector will be reordered to place the argc unconsumed arguments at the front of the vector. temp  A vector of ACE_TCHAR pointers at least argc elements long. The vector will be used for argument shifting as the specified argv vector is consumed. The vector must not be modified while this object exists. If this argument is 0 (the default) the object will allocate and free the temporary vector transparently.

ACE_Arg_Shifter::ACE_Arg_Shifter (  int &    argc, ACE_TCHAR **    argv, ACE_TCHAR **    temp = 0 )

Same behavior as the preceding constructor, but without the "const" qualifier.

ACE_Arg_Shifter::~ACE_Arg_Shifter (  void    )

Destructor.

ACE_Arg_Shifter::ACE_Arg_Shifter (  const ACE_Arg_Shifter &    )  [private]

Copy Constructor should not be used.

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Member Function Documentation

int ACE_Arg_Shifter::consume_arg (  int    number = 1 )

Consume number argument(s) by sticking them/it on the end of the vector.

int ACE_Arg_Shifter::cur_arg_strncasecmp (  const ACE_TCHAR *    flag )

Check if the current argument matches (case insensitive) <flag> ------------------------------------------------------------ Case A: Perfect Match (case insensitive) 0 is returned. ie: when current_arg = "-foobar" or "-FOOBAR" or "-fooBAR" this->cur_arg_strncasecmp ("-FooBar); will return 0 ------------------------------------------------------------ Case B: Perfect Match (case insensitive) but the current_arg is longer than the flag. Returns a number equal to the index in the char* indicating the start of the extra characters ie: when current_arg = "-foobar98023" this->cur_arg_strncasecmp ("-FooBar); will return 7 Notice: this number will always be > 0 ------------------------------------------------------------ Case C: If neither of Case A or B is met (no match) then -1 is returned

const ACE_TCHAR * ACE_Arg_Shifter::get_current (  void    )  const

Get the current head of the vector.

const ACE_TCHAR * ACE_Arg_Shifter::get_the_parameter (  const ACE_TCHAR *    flag )

If the <flag> matches the current_arg of arg shifter this method will attempt to return the associated parameter value Safe to call without checking that a current arg exists In the following examples, a pointer to the char* "value" is ret eg: main -foobar value, main -FooBar value main -FOOBARvalue all of the above will all match the <flag> == -FooBar and will return a char* to "value" main -foobar 4 would succeed and return a char* to "4" main -foobar -4 does not succeed (-4 is not a parameter) but instead, would return 0 0 is returned: If the current argument does not match flag If there is no parameter found after a 'matched' flag If the flag is matched and the flag and paramter DO NOT RUN together, the flag is consumed, the parameter is returned, and the new current argument is the parameter value. ie '-foobarflag VALUE' leaves the new cur arg == "VALUE" If the flag is matched and the flag and parameter RUN together '-foobarflagVALUE', the flag is NOT consumed and the cur arg is left pointing to the entire flag/value pair

int ACE_Arg_Shifter::ignore_arg (  int    number = 1 )

Place number arguments in the same relative order ahead of the known arguments in the vector.

void ACE_Arg_Shifter::init (  void    )  [private]

Refactor the constructor logic.

int ACE_Arg_Shifter::is_anything_left (  void    )  const

Returns the number of args left to see in the vector.

int ACE_Arg_Shifter::is_option_next (  void    )  const

Returns 1 if there's a next item in the vector and it begins with '-'.

int ACE_Arg_Shifter::is_parameter_next (  void    )  const

Returns 1 if there's a next item in the vector and it doesn't begin with '-'.

int ACE_Arg_Shifter::num_ignored_args (  void    )  const

Returns the number of irrelevant args seen.

ACE_Arg_Shifter ACE_Arg_Shifter::operator= (  const ACE_Arg_Shifter &    )  [private]

Assignment '=' operator should not be used.

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Member Data Documentation

int& ACE_Arg_Shifter::argc_ [private]

The size of the argument vector.

const ACE_TCHAR** ACE_Arg_Shifter::argv_ [private]

The array in which the arguments are reordered.

int ACE_Arg_Shifter::back_ [private]

The index of <argv_> in which we'll stick the next unknown argument.

int ACE_Arg_Shifter::current_index_ [private]

The element in <temp_> we're currently examining.

int ACE_Arg_Shifter::front_ [private]

The index of <argv_> in which we'll stick the next known argument.

const ACE_TCHAR** ACE_Arg_Shifter::temp_ [private]

The temporary array over which we traverse.

int ACE_Arg_Shifter::total_size_ [private]

The size of argv_.

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

• /export2/deucetmp/bala/release_try/ACE_wrappers/ace/Arg_Shifter.h
• /export2/deucetmp/bala/release_try/ACE_wrappers/ace/Arg_Shifter.cpp

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