April 2012 - Boost-users - lists.preview.boost.org

k-vertex-connectivity
by Martin 03 Apr '12

03 Apr '12

Hi, does anybody know a function to get the k-node-connectivity (k-vertex-connectivity) of a digraph (or graph)? (http://en.wikipedia.org/wiki/K-vertex-connected_graph) I could only find the function biconnected_components so far. Thanks, Martin

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Lambda and placeholders
by Sven Bauhan 02 Apr '12

02 Apr '12

Hi, I just tried to use boost::lambda to prevent from creating an extra Functor class just for one call. This is the code I tried: std::deque<LightningSlice>::const_iterator l = std::find_if( m_lightnings.begin(), m_lightnings.end(), boost::lambda::_1.timeslice().contains(time_) ); with typedef std::deque<LightningSlice> LightningQueue; LightningQueue m_lightnings; //!< The lightnings in timeslices const boost::posix_time::time_period& LightningSlice::timeslice() const { return this->m_period; } Then I get the error: ../LightningIndex.cpp:38: error: 'const struct boost::lambda::lambda_functor<boost::lambda::placeholder<1> >' has no member named 'timeslice' What did I wrong? Thanks, Sven

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regex_replace and Unicode ( Cyrillic ) problem
by valery O 02 Apr '12

02 Apr '12

Hi, I have a string with 2 Cyrillic words новый дом repeated 3 times. I try to regex_replace each occurrance of these words. For this I use std:: string format("$1 красный $2") and regex pattern ("(\\W+)\\s+(\\W+)"), The result is only the last occurrence is replaced,the 2 preceding ones are not. Where is my mistake? My code: #include <iostream> #include <string> #include "boost/regex.hpp" using namespace std; int main(int argc, const char** argv) { std::string str( "новый дом, новый дом новый дом" ); regex regx("(\\W+)\\s+(\\W+)"); std::string format( "$1 красный $2"); cout<<"regex_replace :"<<regex_replace( str, regx, format ); return 0; } I use iMac Intel Core Duo, Mac OSX 10.6.8, IDE - Xcode 3.2.6 Thank you. egersheldster

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[move] Move c-tor template
by Szymon Gatner 01 Apr '12

01 Apr '12

Hi, I am implementing custom smart pointer with move semantics and I am having problems with implementing move constructor with template param. In fact clone_ptr presented in docs suffers from that issue also. This code: class B {} class D: public B {} clone_ptr<D> makeD(); void main() { clone_ptr<B> b = makeD() // gives "error C2440: 'initializing' : cannot convert from 'clone_ptr<T>' to 'clone_ptr<T>'" } adding template <class U> clone_ptr(BOOST_RV_REF(clone_ptr<U>) p) //Move constructor : ptr(p.ptr) { p.ptr = 0; } to clone_ptr class does not help. Additional c-tor seems to be ignored. How to fix that? Cheers, Simon -- Szymon Gatner The Lordz Games Studio www.thelordzgamesstudio.com

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Re: [Boost-users] [boost] [test] Am I supposed to be able to use std::wstring in BOOST_CHECK_EQUAL?
by Daniel Trebbien 01 Apr '12

01 Apr '12

Hello Michael, Unfortunately, not yet. std::wstring support in BOOST_CHECK_EQUAL is Ticket #1136 (Let BOOST_CHECK_EQUAL support std::wstring): https://svn.boost.org/trac/boost/ticket/1136 Daniel Trebbien On 2012-04-01, Michael Kochetkov <michael.kv(a)gmail.com> wrote: > Hello, > Am I supposed to be able to use std::wstring in BOOST_CHECK_EQUAL? > I.e. > std::wstring s1,s2; > BOOST_CHECK_EQUAL(s1,s2); > > -- > Michael Kochetkov > > > _______________________________________________ > Unsubscribe & other changes: > http://lists.boost.org/mailman/listinfo.cgi/boost >

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[parameter] Documented way to call arg-pack-accepting function generated by BOOST_PARAMETER_FUNCTION
by Jeremiah Willcock 01 Apr '12

01 Apr '12

Is there a documented way to call a function generated using BOOST_PARAMETER_FUNCTION with an explicit ArgumentPack? The "<f>_with_named_params" hinted at in the documentation does not seem to exist. -- Jeremiah Willcock

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