Re: Replaces macros by metaprogramming
* Vincent R:
I am trying to write a framework that is supposed to work either using
native windows ce UNICODE C strings based on UTF16(wchar_t) or ansi/utf8.
So with this constraints I have in my code somlething like :
#ifdef _UNICODE
// Only copy UTF16 Value.lpszW to szStoreName(UTF16)
wcsncpy(msgStoreInfo.szStoreName, lpProp->Value.lpszW, 127);
#else
// Convert UTF16 Value.lpszW to szStoreName(ANSI)
wcstombcs(msgStoreInfo.szStoreName, lpProp->Value.lpszW, 127);
#endif
Since on wince API exists only in UNICODE version, in my previous
example lpProp->Value.lpszW is always in UTF16 but szStoreName is
defined like this :
tchar_t szStoreName[128]; ie in UNICODE it's a wchar_t while in ansi
it's the well know char.
My question is wouldn't be possible to replace those ugly defines by
some templated class that would have a method and that would copy it or
convert it in function of tchar_t type ?
template <wchar_t T>
class UniConv
{
};
template <char T>
class UniConv
{
};
and then I could write something like :
Uniconv<tchar_t>::Strncpy(msgStoreInfo.szStoreName, lpProp->Value.lpszW,
127);
I mean I want something similar ... is it possible ?
Yes it's possible although not with the syntax you've shown.
However, and sorry for calling a spade a spade but it's necessary, using
Microsoft's TCHAR support is braindead, just a load of added grunt work and
nasty bug entry vectors, unless you're supporting Windows 9x and have to use
dynamically linked MFC, which is the only known case where it can possibly save
work. That's a rather narrow and archaic market segment, I mean, how many users
of your app use it in Windows 9x, refuse to upgrade, and insist that you use
dynamically linked MFC? About zero, I'd guess. Certainly not more than 1, unless
some kind of religious cult has grown up recently. So, in summary, for nearly
all practical purposes the approach shown above is braindead, sorry.
Now, I've saved you a /lot/ of work (namely, you only have to support Unicode,
nothing more), so reciprocating you may consider posting such more-or-less
Microsoft-specific questions to a Microsoft-specific group next time. :-)
Cheers & hth.,
- Alf
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