[Boost-users] Boost.Units - Can't figure out how to use it

Subject: [Boost-users] Boost.Units - Can't figure out how to use it
From: Brandon Olivares (programmer2188_at_[hidden])
Date: 2009-12-23 00:51:05

Hi,

I've been reading the documentation for Boost.Units. I understand most of
what it is saying, but am still confused on how to do many things with this
library.

Most of the examples are using that test_system.hpp. Does this mean that you
actually have to explicitly define the units you want to use?

I am confused because I see the header files for the units I want to use,
e.g., light_year or astronomical_unit, but I can't figure out how to
actually use them. If I use boost::units::astronomical::light_second, it
cannot find it. I am able to use the SI units just fine, such as:

Quantity<si::length> l = 4.0 * si::meters;

But beyond that, I'm lost.

I also don't know which headers I should include. I don't know if there's
one or two headers that include all the basics I would need, or if I have to
include each of them individually.

Here's a simple program I was trying to write just to test light_second, but
do not know how to make it work or which headers to include:

int main()
{
using namespace boost::units;
using namespace boost::units::astronomical;
using namespace std;

quantity<light_second> l1 = 4.0 * light_second;

cout << "l1 = " << l1 << endl;

return 0;
}

I'm using Boost 1.41 and I'm on Windows using Cygwin.

Thanks,
Brandon

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