id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
860	program_options: long options use prefix only	goldwynr	nobody	"{{{
Using program_options defaults, while scanning for long_options, only the prefix is used.

So long options which begin with the same alphabets result in ambiguous results.

A program which takes --foo(-f), --fool(-l), --fooled(-d) as options currently works like the following:

~/program_options_tests$ ./a.out -f
foo option selected
~/program_options_tests$ ./a.out -l
fool option selected
~/program_options_tests$ ./a.out -d
fooled option selected
~/program_options_tests$ ./a.out --fo
error: ambiguous option fo
~/program_options_tests$ ./a.out --foo
error: ambiguous option foo
~/program_options_tests$ ./a.out --fool
error: ambiguous option fool
~/program_options_tests$ ./a.out --foole
fooled option selected
~/program_options_tests$ ./a.out --fooled
fooled option selected

Expected results:
----------------
./a.out --foo
./a.out --fool
./a.out --fooled 
should have been valid options

./a.out --foole
should have been an invalid option


Actual Results:
--------------
./a.out --foo
./a.out --fool
failed.

./a.out --foole
was accepted as --fooled option.

The program used is attached.


}}}"	Bugs	closed		None	None	Problem	Invalid