std::tr1::variate_generator

Clang Frontend
#1

Hello

I am attempting to convert some code which compiles with g++ 4.4 to work with Clang31 and libc++.

The code includes <tr1/random> which exists in the g++ includes but not in libcxx/include.

libc++ does have a file <random> which does have most of the things needed but not the template class variate_generator defined like this in <tr1/random>

  template<typename _Engine, typename _Dist>
    class variate_generator

Is there an equivalent in libc++ or should I just import the g++ 4.4 file?

Thanks

John

P.S. The full set of defines being made in the code are:

    std::tr1::mt19937 uint_gen;
    std::tr1::uniform_real<double> uniform_dist;
    std::tr1::variate_generator< std::tr1::mt19937, std::tr1::uniform_real<double> > uniform_gen;
    std::tr1::normal_distribution<double> normal_dist;
    std::tr1::variate_generator< std::tr1::mt19937, std::tr1::normal_distribution<double> > normal_gen;

#2

You should be able to use the (presumably portable) implementation of TR1
included in Boost

http://www.boost.org/doc/libs/1_49_0/doc/html/boost_tr1/subject_list.html

The random number generation stuff seems to use Boost Random internally, which
I think it a header-only library.

best regards,
Florian Pflug

#3

AMDG

Hello

I am attempting to convert some code which compiles with g++ 4.4 to work with Clang31 and libc++.

The code includes <tr1/random> which exists in the g++ includes but not in libcxx/include.

libc++ implements C++11, not TR1. variate_generator
didn't make it into the standard.

libc++ does have a file <random> which does have most of the things needed but not the template class variate_generator defined like this in <tr1/random>

  template<typename _Engine, typename _Dist>
    class variate_generator

Is there an equivalent in libc++ or should I just import the g++ 4.4 file?

Thanks

John

P.S. The full set of defines being made in the code are:

    std::tr1::mt19937 uint_gen;
    std::tr1::uniform_real<double> uniform_dist;
    std::tr1::variate_generator< std::tr1::mt19937, std::tr1::uniform_real<double> > uniform_gen;
    std::tr1::normal_distribution<double> normal_dist;
    std::tr1::variate_generator< std::tr1::mt19937, std::tr1::normal_distribution<double> > normal_gen;

In Christ,
Steven Watanabe

#4

libc++ does not implement TR1, but does have a complete implementation of C++11. In C++11 <random> is in namespace std, not std::tr1. Also variate_generator was removed from the C++11 spec in N1933 dated 2006-02-23. The rationale for this removal is in the paper and will likely more clearly explain how to modify your code than I could here. Here is a link to the paper:

Howard

#5

Thank you all for your helpful replies.
I am using boost/tr1/random.hpp from 1.49.0 to fix the library code I am working with.
I will report the wider issues to the author of the library, who had not I think compiled it with clang.
As usual it is easy to learn new things in this community.

John