Re: [wxlua-users] Back to ParseDate

[John L. <jla...@gm...>]

On Sat, Jun 9, 2012 at 10:25 AM, Andre Arpin <ar...@ki...> wrote:
> I am having a hard time understanding the use of iterator in wxlua.
>
> I guess an iterator is created by wxString::const_iterator end() or
> wxString::const_iterator begin() for wxString which would be coded
> wx.wxString(str):end() but end is a reserve word in Lua. I guess end could be
> renamed.

That is unfortunate. You can get the function using this...

s = wx.wxString()
e = s['end']
iter_end = e(s)

> aa = wx.wxString("09-06-2012")
> print(date:ParseDate(aa, wx.wxString_const_iterator(aa:begin())))
> aa = wx.wxString("")
> print(date:ParseDate(aa, wx.wxString_const_iterator(aa:begin())))

This is probably not right, you would need to call it like this.

it = aa:const_iterator()
print(date:ParseDate(aa, it))

> Are iterators useful in wxLua? The addition in wxWidget maybe justified for
> saving copying of strings in a tight loop but most of the time C++ programmer
> will replace their code in the following way and live with the overhead.

They're required for using UTF8 since not every code point is a single char.

I think the simplest solution is to return two values, [bool, Lua
String of start of input on failure] where the second Lua String is
only returned on failure and contains the start of the input string up
until the failure. I hope to have time to do it tomorrow night.

Regards,
     John