Solved it this way:
si::dimensionless unscaled;
double f = conversion_factor(u,unscaled);
if (f < 1)
{
int64_t intf = static_cast
AMDG
On 02/17/2014 07:40 AM, Lindley French wrote:
For the life of me I can't figure out where the actual multiplication of the value occurs. Boost Units is very clever template magic, but I doubt anyone could maintain the thing without weeks of studying the design....
detail/conversion_impl.hpp:345
return(destination_type::from_value(static_cast<T2>(source.value() * conversion_factor(u1, u2))));
This won't really help you because the result of conversion_factor returns a double.
The scale is evaluated at detail/conversion_impl.hpp:448 return(conversion1::value() * (scale::value() / conversion2::value()));
"scale" here is the result of get_scale_list/eval_scale_list. get_scale_list collects the scaling factors, eval_scale_list multiplies their ::value() together.
Again, scale::value() returns a double, because the individual scale factors use double. (See scale.hpp)
On Mon, Feb 17, 2014 at 9:48 AM, Lindley French
wrote:
What's the best way to access the current scaling of a dimensionless value? Maybe I can back it out myself rather than relying on type conversion to do it.
There's a metafunction called get_scale_list, which returns an MPL sequence whose members contain
static const long base = ...; typedef static_rational<...> exponent;
It's not documented, so use it at your own risk. It's unlikely to change, but I make no guarantees.
In Christ, Steven Watanabe
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