id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
13583	quantities can be assigned from cmath sqrt result, but not initialized	edaskel@…	Matthias Schabel	"The cmath functions are very helpful in letting me perform math on quantities, but I ran across an inconsistency. Code like:

{{{
    quantity<wavenumber, float> x, y;
    quantity<wavenumber, float> foo = sqrt(x*x + y*y);
}}}

fails to compile (with an ""error: conversion from...""). The workaround is to use an assignment instead:

{{{
    quantity<wavenumber, float> foo;
    foo = sqrt(x*x + y*y);
}}}

It seems odd to have this restriction (and it's certainly undocumented) so I suspect it is a bug.
"	Bugs	new	To Be Determined	units	Boost 1.67.0	Problem