Associates two functions with @group which will be called
from g_option_context_parse() before the first option is parsed
and after the last option has been parsed, respectively.
Note that the user data to be passed to @pre_parse_func and
@post_parse_func can be specified when constructing the group
with g_option_group_new().
Associates two functions with @group which will be called from g_option_context_parse() before the first option is parsed and after the last option has been parsed, respectively.
Note that the user data to be passed to @pre_parse_func and @post_parse_func can be specified when constructing the group with g_option_group_new().