- Boost-users - lists.boost.org

Re: [Boost-users] Binding to an overloaded member function
by Javier Estrada 05 Dec '06

05 Dec '06

Excellent. Thx. I knew it was somewhere in the documentation (Boost 1.33) but I could not get my hands around it ;-) -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Sebastian Redl Sent: Tuesday, December 05, 2006 1:20 PM To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] Binding to an overloaded member function Javier Estrada wrote: > How can I use boost bind to bind to an overloaded member function? > You have to cast explicitly to select the correct overload. > But when I added: > > void C::dial(char key, MyConstants c); void C::dial(string toDial); > void C::dial(string, MyConstants c); > > References to my working code break: > > for_each(begin, end, boost::bind(&C::dial, this, _1 )); > for_each(begin, end, boost::bind( static_cast<void (C::*)(char)>(&C::dial), this, _1)); Sebastian Redl _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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Binding to an overloaded member function
by Javier Estrada 05 Dec '06

05 Dec '06

How can I use boost bind to bind to an overloaded member function? I had working code for a member function: void C::dial(char key); But when I added: void C::dial(char key, MyConstants c); void C::dial(string toDial); void C::dial(string, MyConstants c); References to my working code break: for_each(begin, end, boost::bind(&C::dial, this, _1 )); Regards, Javier

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Boost-users Digest, Vol 1107, Issue 3 (fwd)
by Mark Ruzon 05 Dec '06

05 Dec '06

>On Dec 4, 2006, at 6:28 PM, Mark Ruzon wrote: > >> The documentation for tuple says there are no portability problems >> with >> gcc 2.95. I am using 3.2.3 and am getting a syntax error on the >> line that >> does the work of this function object: >> >> #include <boost/tuple/tuple.hpp> >> >> struct get_0_func { >> template <typename II> // II models Input Iterator on tuple >> void operator()(II it) { it->get<0>(); } > >try : > > void operator()(II it) { it->template get<0>(); } > >Not tested, but this is likely the reason. The compiler does not how >yo parse < between get and 0, if not told >that get is a template. > > Jaakko J?rvi Thank you, Jaakko, this works fine. How do I get the documentation for tuple amended to include this form? Mark

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[iostreams] How to strip off checksum at end of file in multichar input filter?
by eg 05 Dec '06

05 Dec '06

Hi all, I've written a multichar_dual_use_filter for to handle a custom file encryption. Ideally, the encrypted file format consists of 3 distinct types of data: 1) initialization vector IV (only used by encry/decryp) 2) Main file data 3) Checksum (only used to validate file decryp is correct) The output filter can easily write the above 3 items. I have the input filter reading in and handling items 1 and 2 above... But I need some advice on how to strip off the checksum (or any fixed size chunk of data) at the end of the file to validate but not pass this into the output buffer. I have thought of passing in the input file size to the filters constructor and keep track of how many bytes are being processed... then handling the final bytes separately. Does this sound like a feasible approach? It makes using the filter harder as it imposes unusual constraints on calling it. Any other ideas? My current filters Read function is of the following form: template<typename Source> std::streamsize read(Source& src, char* s, std::streamsize n) { if (!bInit) { // Handle reading IV bytes and initialization } // Read in buffer to "s" and then decrypt it count = boost::iostreams::read(src, s, n); if (count <= 0) return -1; //EOF or Error // Decrypt s in place DecryptBuf(s, count); return count; }

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[regex] - merging scanners
by Frank Bergemann 05 Dec '06

05 Dec '06

Hi, is there a way to define a set (list) of regular expressions and merge them into *one* "scanner". So that i can pass some input string to this merged scanner ( with a _single_ function call ) and as a result get back which of the regular expression(s) match for that string (two modes:(1) 1st hit & (2) all hits)? Currently i use a loop to check for each expression individually/sequentially. \Frank

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Another sub_range problem
by abir basak 05 Dec '06

05 Dec '06

Hi, I am facing some more range problem from boost::range; According to the CVS RC_1_34 works. Revision 1.21 version specified by Thorsten Ottosen , most of the classes work. What is my interest is to have a get_range function inside some of the container class like std::vector and boost::circular_buffer (from boost CVS) Here I have test class to show the problem I am facing. First, when I inherit from a vector , and specify a range function just like iterator functions ( begin() and end() ) template<typename T> class range_vector : public std::vector<T>{ public: typedef boost::sub_range<range_vector> range; typedef boost::sub_range<const range_vector> const_range; range get_range(size_type from,size_type to){ std::cout<<"range"<<std::endl; return range(begin()+from,begin()+to); } const_range get_range(size_type from,size_type to)const{ std::cout<<"const range"<<std::endl; return const_range(begin()+from,begin()+to); } }; int main(){ range_vector<int> v; int x[] = {0,1,2,3,4,5,6,7,8}; v.insert(v.end(),x,x+9); std::copy(v.begin(),v.end(),std::ostream_iterator<int>(std::cout," ")); std::cout<<std::endl; range_vector<int>::range r = v.get_range(1,5); r[0] = 100; copy(r.begin(),r.end(),std::ostream_iterator<int>(std::cout," ")); std::cout<<std::endl; range_vector<int>::const_range cr = v.get_range(1,5); copy(cr.begin(),cr.end(),std::ostream_iterator<int>(std::cout," ")); std::cout<<std::endl; const range_vector<int>& cv = v; range_vector<int>::const_range cr1 = cv.get_range(1,5); copy(cr.begin(),cr.end(),std::ostream_iterator<int>(std::cout," ")); std::cout<<std::endl; } This code compiles perfectly and gives result as expected. It also works with deque . However when I compile the same code for boost::circular_buffer,i.e template<typename T> class range_vector : public boost::circular_buffer<T>{ public: typedef boost::sub_range<range_vector> range; typedef boost::sub_range<const range_vector> const_range; range get_range(size_type from,size_type to){ std::cout<<"range"<<std::endl; return range(begin()+from,begin()+to); } const_range get_range(size_type from,size_type to)const{ std::cout<<"const range"<<std::endl; return const_range(begin()+from,begin()+to); } }; It has a same interface that of a vector, it fails to compile when I call the non-const get_range function. i.e //Initialized the circular_buffer with a few elements. range_vector<int> v; int x[] = {0,1,2,3,4,5,6,7,8}; v.insert(v.end(),x,x+9); std::copy(v.begin(),v.end(),std::ostream_iterator<int>(std::cout," ")); std::cout<<std::endl; ///got a const reference and invoking const version of get_range. works fine. const range_vector<int>& cv = v; range_vector<int>::const_range cr1 = cv.get_range(1,5); copy(cr1.begin(),cr1.end(),std::ostream_iterator<int>(std::cout," ")); std::cout<<std::endl; ///now trying to get a non-const version range_vector<int>::range r = v.get_range(1,5); Here it gives error in Visual Studio e:\boost_1_33_1\boost\range\iterator_range.hpp(60): error C2440: 'type cast' : cannot convert from 'boost::range_iterator<C>::type' to 'boost::range_iterator<C>::type' with [ C=const boost::sub_range<range_vector<int>> ] and [ C=range_vector<int> ] ///now trying to get a non-version and assign it to const version range_vector<int>::const_range r = v.get_range(1,5); It gives the same error. Here C (container) is passed as correct one. begin() and end() are too executes correct version (non-const one). Not getting why it won't work. Any kind of help is highly appreciated. Thanks to boost community in advance. abir basak -- Abir Basak, Member IEEE Software Engineer, Read Ink Technologies B. Tech, IIT Kharagpur email: abir(a)abirbasak.com homepage: www.abirbasak.com

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[tuple] get not compiling with gcc 3.2.3
by Mark Ruzon 05 Dec '06

05 Dec '06

The documentation for tuple says there are no portability problems with gcc 2.95. I am using 3.2.3 and am getting a syntax error on the line that does the work of this function object: #include <boost/tuple/tuple.hpp> struct get_0_func { template <typename II> // II models Input Iterator on tuple void operator()(II it) { it->get<0>(); } }; The boost::get<0>(*it) form works fine. Does anyone know why a newer version of gcc would not compile this? Mark

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Why BOOST_CURRENT_FUNCTION not in docs?
by Pavel Syomin 04 Dec '06

04 Dec '06

Hi all! Why BOOST_CURRENT_FUNCTION not in docs? Is it a part of API or not?

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functional/hash: hash_value with context
by Boris Mansencal 04 Dec '06

04 Dec '06

Hi, A newbie question regarding functional/hash. I would like to use TR1 unordered_map for a 2D point custom data type. For this, I use hash_value from Boost. But I would like to give/pass a context to this function : here, width & height of domain in which are my 2D points. Currently, I declare theses width and height static. My code (in my cpp file) looks like : static int P_width; static int P_height; std::size_t hash_value(point const& p) { return ((size_t)p.x()<<1)*P_width + (size_t)(p.y()<<1); } But this solution is not satisfactory as I can not have several instances of my class including the unordered_map, i.e., several domains of different width & height. Is there a straightforward solution that I have overlooked ? Regards, Boris.

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[License] OSI certification progress
by Ole Christian Weidner 04 Dec '06

04 Dec '06

Hi, I just read through the Boost License page at http:// www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl? Boost_License. It states that an OSI license approval process has been initiated in January 2005 - now I'm curious about the status quo, since I can't find any further information on this effort... It would be much easier to release software under the Boost License if one could directly refer to OSI compliance since they seem to be well known and have a broad acceptance. Does anyone have any information on this topic? Thanks a lot! Cheers, Ole

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