gmane.comp.lib.boost.user

logger progress?

Victor Whiskey Yankee — 2012-05-26T15:28:29

Hello,

How is the boost logger going for proper inclusion?

Thanks,
Vic

Apple "Block" closures and boost::function

John M. Dlugosz — 2012-05-26T14:41:52

I'm looking at using Apple's proprietary closure blocks as a substitute for C++ lambda 
functions on a project that needs to be portable between Mac (LLVM 3.1, but not using the 
C++0x dialect compiler switch) and Windows (Visual Studio 10).  The project uses Boost.TR1 
to supply std::tr1::function and related stuff on the Mac build.

Now I found that the compiler handles the nonstandard block objects in Functor-like 
template situations in a manner perfectly analogous to C-style pointers to functions.  I 
can even assign one to a boost::function with no complaint!

The only issue seems to be that it never calls Block_copy/Block_release.  So it works OK 
for passing them to STL algorithms that uses them on the spot, but will probably do bad 
things if used in general.

Does anybody have something ready-made, to efficiently add the copy/destroy semantics to 
functors that hold such "blocks"?  That would be much more efficient than wrapping them in 
another layer.  Or, any pointers to the Boost innerds for doi

Asynchronous signals library

Edward Diener — 2012-05-26T02:56:57

The signals and signals2 library work with signals ( events ) which are 
handled synchronously. Is there any Boost library, based on the function 
prototyping methods of signals(2), in which the signals are handled 
asynchronously ?

Why does the fusion::set repeated keys?

niXman — 2012-05-26T02:04:25

Hi,

In this simple code, I expect that the size of the fusion::set is
equal to one, because keys are the same.
Why the size is equal to two?

#include <boost/fusion/container/set.hpp>
#include <boost/fusion/include/set.hpp>
#include <boost/fusion/container/set/set_fwd.hpp>
#include <boost/fusion/include/set_fwd.hpp>
#include <boost/fusion/sequence/intrinsic/size.hpp>
#include <boost/fusion/include/size.hpp>
#include <iostream>

int main() {
   typedef boost::fusion::set<int, int> set1;
   set1 s1;

   std::cout
   << "size1 = " << boost::fusion::result_of::size<set1>::type::value
   << ", size2 = " << boost::fusion::size(s1)
   << std::endl;
}

http://liveworkspace.org/code/166b54cdd208f7b252bf1f38a1a6ec4b

Thanks!

[Test] main for BOOST_TEST_DYN_LINK with manualregistration

Rhys Ulerich — 2012-05-25T21:28:07

What from example 15 from the Boost.Test "Manually registered test
suites" documentation[1] needs to change if instead of
   #include <boost/test/included/unit_test.hpp>
one used
   #define BOOST_TEST_DYN_LINK
   #include <boost/test/unit_test.hpp>
?

the unit_test_main, but I'm at a loss for what it would look like...
I don't think I'm running afoul of BOOST_TEST_ALTERNATIVE_INIT_API
from reading <boost/test/unit_test.hpp> where the main() definition
cares nothing about that #define, but I could be wrong.

Help or a known-good example much appreciated,
Rhys

[1] http://www.boost.org/doc/libs/1_49_0/libs/test/doc/html/utf/user-guide/test-organization/manual-test-suite.html
[2] http://www.boost.org/doc/libs/1_49_0/libs/test/doc/html/utf/user-guide/test-runners.html

"invalid signature" in boost::archive::binary_iarchive

Ibrahim Beicker — 2012-05-25T18:44:07

I had to port a multi-process application to 64 bits and I rely on boost
serialization to send messages, that are maps of key-values, into Microsoft
queues to the other modules. It works just fine into 32 bits but when I run
it in 64 the constructor throws an "invalid signature" exception

void Message::fromBinary( const std::string& data )
{
  std::stringstream ss;
  ss << data;
  boost::archive::binary_iarchive ia(ss); //exception here

  ia >> *this;
}

I managed to debug into basic_binary_iarchive.ipp and this 'if' < at > line 72
fails

if(file_signature != BOOST_ARCHIVE_SIGNATURE())

boost::serialization::throw_exception(archive_exception(archive_exception::invalid_signature));

inside this file I have no debug symbols so I don't know the values of
'file_signature' and 'BOOST_ARCHIVE_SIGNATURE' or where
BOOST_ARCHIVE_SIGNATURE is defined.

Some additional information: the modules are all running on the same
machine, on windows 7 64-bits, and  compiled by visual studio 2010 x64
including static boost librarie

[container] Compilation failure with clang 3.1

Alexandre Hamez — 2012-05-25T08:07:57

Hello,

When compiling Boost.Container, clang 3.1 (stable release, Mac OS X 10.7.4) 
fails:
 

However gcc 4.7 has no problem with it. Does anyone has experienced the 
same thing and possibly found a workaround?

Thank you!

Alexandre Hamez

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[msm] Two identical orthogonal regions?

Aurelian Melinte — 2012-05-24T18:25:33

Hi,

I am trying to put two identical orthogonal regions in a state machine 
(each region would model a "channel" and I can have multiple such 
channels).

One way I can think of is duplicating the states through typedefs and 
duplicating entries in the transition table.

Is there a way to avoid this duplication?

Regards,
a.

Iterator concept checking

McNamara, Nate — 2012-05-24T15:39:41

I'm trying to learn to use BOOST_CONCEPT_CHECK for custom iterators,
ranges, and containers.  I've built a simple linked list class with an
iterator (and const_iterator) that, as far as I can tell, satisfies the
forward traversal iterator requirements.  However, g++ gives the
following errors:

concept.cpp:81: error: `*' cannot appear in a constant-expression
concept.cpp:81: error: a call to a constructor cannot appear in a
constant-expression
concept.cpp:81: error: template argument 1 is invalid
concept.cpp:81: error: template argument 1 is invalid
concept.cpp:82: error: `*' cannot appear in a constant-expression
concept.cpp:82: error: a call to a constructor cannot appear in a
constant-expression
concept.cpp:82: error: template argument 1 is invalid
concept.cpp:82: error: template argument 1 is invalid
concept.cpp:83: error: `*' cannot appear in a constant-expression
concept.cpp:83: error: a call to a constructor cannot appear in a
constant-expression
concept.cpp:83: error: template argument 1 is invalid
c

boost::asio one connectio-per-thread

Christer Borgqvist — 2012-05-24T08:25:02

Hello,
is this a code appropriate?

    boost::asio::io_service io_service;
    tcp::acceptor a(io_service, tcp::endpoint(tcp::v4(),3080));
    for (;;) {
        socket_ptr sock(new tcp::socket(io_service));
        a.accept(*sock);
        emv_clientthread_ptr cli(new axf::server::server_socket(sock));
        boost::thread t(boost::bind(&axf::server::server_socket::start, 
cli));
    }
appreciate any help.
Christer

[multi_index] movable only types

Szymon Gatner — 2012-05-23T20:40:20

Hi,

with boost.move available are there any plans to make multi_index work
with movable-only types?

[Geometry] spatial linestring access along line

Stephan Menzel — 2012-05-23T15:08:59

Hi all,

before I begin, let me tell that geometry is not exactly my strong
suite so please forgive my probably dumb question.

I have started to work with boost geometry which, I find very neat,
and assembled a line string.

Now I basically need a method that gives me a point to a length value.
Like when my linestring is 100 units long and I say give me the point
at 3 I want the exact position of the point (coordinates) as if I were
following the line for exactly 3 units.

I have an approach that would allow me to implement this myself by
following the segments (possibly after indexing them) but I have a
feeling that one of those many functions provided by the library
itself might do just that and I simply don't know it. If anyone knows
if such is the case, would be nice to give me a heads up.

Thanks,

Stephan

Spirit, StateChart, MSM

asif saeed — 2012-05-23T07:10:53

Hi,

What are the differences between these three libraries? I feel I can use
any of these libs. Is there any page where the comparison/pros&cons are
listed and so on?

Best regards, Asif
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[mpi] multithreaded/funneled messaging

Brian Budge — 2012-05-22T20:23:54

Hi all -

Is boost.mpi able to work with MPI_THREAD_MULTIPLE?  If so, how is it specified?

Thanks,
  Brian

boost::serialization "input stream error" inrelease-build (msvc2010)

Jens Saathoff — 2012-05-22T08:32:31

Hi!

I'm using boost::serialization to save a structure to a file and read from
a file. My code works perfect in debug-build, but in release-build an
exception is thrown. I'm using MSVC2010 to build the project on Windows 7
64-Bit-Machine. The code is the same. Who could help me out?

You can find the code here: http://boost.codepad.org/8fp6XnC3


Thank you very much!!!!
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[iostreams] Memory mapped file resize

Vitaly Budovski — 2012-05-22T07:36:08

Hello,

It appears that the implementation of mapped_file in iostreams does
have a resize method, but it isn't documented. If I'm going to be
resizing a mapped_file_sink, are there any issues I need to be aware
of? Particularly around the use of iterators.

Thanks.

boost::signals2::signal - is a "decimated" versionavailable?

Chris Stankevitz — 2012-05-22T00:01:01

Hi,

I'm using boost::signals2::signal to notify a dialog when the state of
an underlying object has changed.

The signal is sometimes is generated at 100Hz.  Other times it is
generated at 1Hz.  The dialog provides a "slot" for this signal that
updates the controls on the screen.  I'd like to limit the "slot rate"
to 10Hz.  By "slot rate" I mean the rate at which the slot receives
notification from the signal.  This will prevent the screen updates
from happening faster than can be seen.

Has this been done already?  If not, I'm going to implement something
like the pseudocode below.  Currently I'm not sure how I to specify
"arguments" nor how I am going to specify the function "SlotCallback".

Thank you,

Chris

===

Pseudocode:

float MaxPeriod = 0.001; // 10Hz

class SignalDecimator
{

public:

  void Register(signal Signal, slot Slot)
  {
    Signal.connect(&SignalDecimator::SlotCallback, this, _1, _2, _3, _4...);

    mSlot = Slot;
  }

private:

  void SlotCallback(arguments Arguments)
  {
    if (Time

Deriving custom archive classes from boost::archive::text_oarchive_impl and boost::archive::text_iarchive_impl

Aldo Longhi — 2012-05-21T19:57:22

*Note:
Boost's archive scheme is based on symmetrical input and output archive
classes.  It's tedious to write about both of them all the time, so I'll
use "?archive" to mean both "oarchive" and "iarchive".*

*Summary:*
After changing the base classes of my custom archives from
binary_?archive_impl to text_?archive_impl, my custom archive classes are
no longer "found" when the compiler is instantiating the serialize(...)
methods in my other classes.

*Background:*
My application was successfully reading and writing files to disk using
subclasses of binary_?archive_impl (the documentation and/or code comments
recommend this over deriving from binary_oarchive).  I needed to switch
from a binary file format to a text format, so I switched the base classes
of my custom archives to text_?archive_impl.  That's when everything blew
up.

*The problem:*
My custom archive classes add functionality, including some additional
methods which do not exist in their Boost base classes; these methods are
called in the seriali

Problem compiling with boost thread

Rajalakshmi Iyer — 2012-05-21T10:23:47

Hello,

I am trying to compile my application with Boost thread library (1.49.0) on
Ubuntu 11.10 (gcc 4.6.1).

However I see this error:

$(BOOST_PATH)/include/boost/thread/detail/config.hpp:29:24: fatal error:
platform.hpp: No such file or directory
compilation terminated.

In the file $(BOOST_PATH)/include/boost/thread/detail/config.hpp, the
platform.hpp is included as:

#include "platform.hpp"

If I change that to:

#include <boost/thread/detail/platform.hpp>

this error goes away.

However, there are a lot of places where headers are included using
relative path, thereby causing compilation errors.

Is there a workaround for this?

Thanks,
Raj

First attempt at using Boost::Test is a flop: theprogram ends with an exception related to std::string but Idon't use any

Ted Byers — 2012-05-21T03:50:22

Here is the full output from my program:

 

$ ./decision.test.suite

terminate called after throwing an instance of 'std::logic_error'

  what():  basic_string::_S_construct NULL not valid

Aborted (core dumped)

 

Now, all the code in this program is focussed on number crunching, so none
of it involves strings.  I am guessing that I missed something in setting up
a test suite.

 

After including the headers for the function objects being tested (some of
which are template classes) as well as headers for several boost libraries,
I have the following:

 

 

#define BOOST_TEST_MAIN decision_tests

#include <boost/test/unit_test.hpp>

#include <boost/test/floating_point_comparison.hpp>

 

BOOST_AUTO_TEST_SUITE( test_decisions )

 

BOOST_AUTO_TEST_CASE( test_dist_moments ) {

 

And I have a series of test cases that start the same way.

 

After setting up the required data for each test, I use something like:

 

    BOOST_CHECK_CLOSE( Sm, 0.00000000000, 0.0001 );

 

or something like:

 

  BOOST_CHECK

Rational: [PATCH] Eliminate excessive calls to gcdand add operator%

Mario Lang — 2012-05-20T18:58:13

Hi.

I am using boost/rational.hpp in my code to represent musical time with
rational numbers.  I have found some possible improvements.  These
improvements have accumulated into a small patch which I'd like to
present for review.  I think it is worth applying.  There doesn't appear
to be a maintainer for rational.hpp though, so I am writing to the list.

The story: In my application I need a remainder operation. Looking at
rational.hpp and its work-horse operators.hpp it became rather obvious
that rational.hpp can and (in my opinion) should implement operator%=
and friends.  operator%= can easily be defined as

return operator-= (other * rational_cast<int_type>(*this / other));

I have been using this definition for operator%= successfully in my code
for quite a while.  During a profiling session it showed up which made
me think a bit more.  Actually, the current way how rational.hpp
implements mixed-mode operators is a waste of performance.  It calls the
corresponding operator with a temporary rational whe