id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
6059,uniform_real_distribution fails when _min = _max,dario.izzo@…,Steven Watanabe,"Connected to BUG report #6053.

Even though all asserts require only that _min <= _max, the condition _min=_max seems to be not handled correctly. Consider the code


{{{
 #include<boost/random/uniform_real_distribution.hpp>
 #include<boost/random/lagged_fibonacci.hpp>
 #include<iostream>

 int main() {
 boost::lagged_fibonacci607 rng(32);
 double r = boost::random::uniform_real_distribution<double>(90,91)(rng);
 std::cout << r << std::endl;
 r = boost::random::uniform_real_distribution<double>(50,50)(rng);
std::cout << r << std::endl;
 return 0;
 }
}}}

the second std::cout will never execute as an infinite loop is encountered before. The problem is in boost/random/uniform_real_distribution.hpp and in particular at generate_uniform_real line:
{{{
if(result < max_value) return result;
}}}

If min_value == max_value the condition above is never met as result = min_value = max_value ALWAYS.

A solution (the one I am currently using) could be

{{{
if ( (result < max_value) || (max_value==min_value) ) return result;
}}}
",Bugs,closed,To Be Determined,random,Boost 1.47.0,Problem,fixed,,