- Boost-users - lists.preview.boost.org

Understanding MPL
by Edward Diener 18 Apr '03

18 Apr '03

I am trying to understand how the MPL library works. I first read "The Boost C++ Metaprogramming Library" by Aleksey Gurtovoy and David Abrahams. When I get to Basic Usage I see this: template< typename Condition , typename T1 , typename T2 > struct if_ { typedef /*unspecified*/ type; }; I am really having trouble understanding the next to last line. How can "typedef type;" be a valid C++ construct and, if it is, what does it mean ? I always though that a typedef … [View More]

7 27

RE: [Boost-Users] Re: command line parsing
by Ben Hutchings 17 Apr '03

17 Apr '03

E. Scott Larsen wrote: > Just FYI to this thread in general. It's been a while since I've messed > with WinMain and command lines, but if my memory serves me right (it was > at a different place, so I don't have the code here), there's some > additional whacky issues here. WinMain recieves the first arguments > differently depending on how it is run: > *) from MSVC debugger > *) from a commandline > *) by clicking on an shortcut icon > *) by clicking in an … [View More]

3 2

RE: [Boost-Users] Powers
by Jim.Hyslop 17 Apr '03

17 Apr '03

basicxml2011 [mailto:basicxml2011@yahoo.com] wrote: > Is their any library or function that can raise a number to a power? Do you mean besides the standard pow() function? -- Jim

1 0

mpl::is_same<Class<A>, T> ?
by Markus Werle 17 Apr '03

17 Apr '03

Hi! Is there a convenient way inside boost::mpl to check whether a certain type T is a template Class<A> with A unspecified? Markus -- Compile time analytic differentiation? Yes, at http://daixtrose.sourceforge.net/

2 1

How to build regex on an Alpha-Dec (True64)?
by Ralf Hupfer 17 Apr '03

17 Apr '03

Hi All, I am having trouble with regex on an Alpha-Dec with Compaq's compiler 6.3. I've got regex to compile with generic.mak as follows: CXX="cxx" CXXFLAGS="-inline-none" -D__USE_STD_IOSTREAM -DBOOST_REGEX_NO_EXTERNAL_TEMPLATES" LINKER="cxx" gnumake generic.mak but then it comes to the link step an error occures: ld: Unresolved: main Nevertheless, boost_regex.so is being build, but when I try to link an application with boost_regex.so I do get loads of errors concerning the C++ … [View More]

4 3

RE: [Boost-Users] Re: command line parsing
by Ben Hutchings 17 Apr '03

17 Apr '03

I wrote: > That is correct. Windows programs receive given a single string of > arguments to parse whereas Unix programs receive a vector which can > be passed to main unchanged by the startup code. ... > A full solution will need to be a little bit more complicated. There > isn't a specification of how Windows command-lines should be generated > or interpreted from an array of strings... What I should have written is: Windows programs receive a single string of arguments … [View More]

4 4

It's there a pitfall in boost::regex?
by Phipps Xue 17 Apr '03

17 Apr '03

Good morning all, I used regex library which is shipped with boost 1.30 in my project. But I found in the case I list below, the regex_match() will crash. Is there a pitfall in it? ===================== CODE LIST BEGIN ========================= #include "stdafx.h" #include <afxconv.h> #include <boost/regex.hpp> using namespace boost; void do_regex_match(const string& s) { USES_CONVERSION; CString _c1,_c2; _c1 = "\\_gl_glcf]a:(D_N~yOA_gg_aeN_o/>jm_gf'0(m_--\\… [View More]

2 1

Powers
by basicxml2011 17 Apr '03

17 Apr '03

Is their any library or function that can raise a number to a power?

1 0

RE: [Boost-Users] Re: command line parsing
by Ben Hutchings 17 Apr '03

17 Apr '03

Vladimir Prus wrote: > cl_corba_at wrote: <snip> > >> Frankly, I've missed the WinMain case, and not sure what to do. > >> The problem is that single string might erase important > >> information --- what happens if you have command line argument > >> with embedded space. > > > > Embedded spaces should be placed in quotation marks which should be > > removed by the tokenizer. Arguments could be seperated by one ore more > > … [View More]

2 1

Converting boost::shared_ptr< const T > to boost::shared_ptr< T >
by Alex Tibbles 17 Apr '03

17 Apr '03

Apologies, news editor != text editor (cntrl-enter != autocomplete). I have persistent objects in my appplication and their factory dishes out only constant references (more precisely only copies of a shared_ptr< const T >). In order to make the persistent objects writable, an underlying record needs to be locked in the RDBMS. A friend template instantiation (a WritablePointer< T >) controls this locking, and effectively gives non-const access to the persistent object. The … [View More]

2 2