id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
9971	Use constexpr for boost::mpl::c_str::value when possible.	ytj000@…	Aleksey Gurtovoy	"Right now boost::mpl::c_str::value is a static const member variable.
I think it is a decent idea to add the constexpr keyword here.

I have a patch for this issue. Here is an example why it is useful:

{{{
#include<boost/mpl/string.hpp>
int main() {
    using H = boost::mpl::string<'h'>;
    static_assert(boost::mpl::c_str<H>::value[0] == 'h', """");
}
}}}

Without my patch, compiler will complain we could not use c_str::value in constant expression. With my patch, compiler will accept this code.

Tested in clang++ 3.4, CentOS 6.3, but I think GCC should works as well."	Patches	new	To Be Determined	mpl	Boost Development Trunk	Problem