id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
8438	vector & circular_buffer storage misbehave when using compiler optimizations	ofir	Gunter	"When compiling the following code without optimizations, it behaves as expected: (compiled with g++-4.7.2 with no flags at all)


{{{
#include <boost/numeric/ublas/vector.hpp>
#include <boost/numeric/ublas/io.hpp>
#include <boost/circular_buffer.hpp>

int main () {
    boost::numeric::ublas::vector<double, boost::circular_buffer<double> > v (3, 1);
    std::cout << v << std::endl;
    v[1] = 5;
    std::cout << v << std::endl;
    std::cout << v[1] << std::endl;
    return 0;
}
}}}



Output:

{{{
[3](1,1,1)
[3](1,5,1)
5
}}}


When compiling the exact same code with O1, O2, and O3 it produces the following output:

{{{
[3](0,0,0)
[3](0,0,0)
5
}}}


I noticed that inner_prod() also sees the vector as zeros."	Bugs	new	To Be Determined	uBLAS	Boost 1.52.0	Problem			Douglas Gregor Jan Gaspar ofirmebel@…