id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
10520	Conversion warning in intrusive/detail/utilities.hpp	mbradle@…	Ion Gaztañaga	"Hello,

When I compile the following simple code test.cpp

{{{
#include <boost/intrusive/detail/utilities.hpp>

int main()
{
  return 0;
}
}}}
with g++ version 4.8.1, Boost 1.56, and the compilation line
{{{
g++ -I/home/mbradle/boost -Wconversion test.cpp
}}}
I get the warning
{{{
In file included from test.cpp:1:0:
/home/mbradle/boost/boost/intrusive/detail/utilities.hpp: In function ‘float boost::intrusive::detail::fast_log2(float)’:
/home/mbradle/boost/boost/intrusive/detail/utilities.hpp:592:18: warning: conversion to ‘float’ from ‘int’ may alter its value [-Wconversion]
    return (val + log_2);
                  ^
}}}
Casting log_2 as a float removes the warning, but, given that I do not get this warning if I compile against Boost 1.55 and that I see no difference between the fast_log2 routines in the two versions, I suspect that casting is not the correct fix.  Thanks, and best wishes.

Brad Meyer"	Bugs	closed	To Be Determined	intrusive	Boost 1.56.0	Cosmetic	fixed