Re: [boost] Boost Units library preview

From: Andy Little (andy_at_[hidden])
Date: 2006-08-18 09:03:38

"Thorsten Ottosen" <nesotto_at_[hidden]> wrote in message 
news:loom.20060818T123417-474_at_post.gmane.org...
> Andy Little <andy <at> servocomm.freeserve.co.uk> writes:
>
>> // Quan
>>   quan::length::ft qft(3);
>>   std::cout << "quan qft.numeric_value() = "<< qft.numeric_value() << '\n';
>>   assert(qft.numeric_value() ==3);
>
> Just a question: why is the member called numeric_value? are there other 
> values?

The function is called numeric_value as it returns the numeric value of the 
quantity.

quan::length::mi my_journey(25); // distance in miles
quan::length_<int>::nm dx (25);  // distance in nanometers

The numeric value of journey is 25, the numeric value  of dx is 25, but the 
units are very different.

See for example (in http://physics.nist.gov/cuu/pdf/sp811.pdf)

Page v, Checklist for reviewing manuscripts:

item (7)

"It is clear to which unit symbol a numerical value belongs ... etc"

item (10)

"There is a space between the numerical value and the unit .. etc"

etc.

regards
Andy Little