Re: [boost] [units] problems

Subject: Re: [boost] [units] problems
From: Robert Ramey (ramey_at_[hidden])
Date: 2013-09-13 21:47:38

Steven Watanabe wrote:
> AMDG
>
> On 09/13/2013 03:48 PM, Robert Ramey wrote:
>> Steven Watanabe wrote:
>>> On 09/13/2013 01:54 PM, Robert Ramey wrote:
>>>> <snip>
>>>> void main(){
>>>>     using namespace boost::units;
>>>>     using namespace boost::units::si;
>>>>     using namespace boost::units::us;
>>>>     quantity<length, float> l1;
>>>>     l1 = 1000.0 * meters;
>>>>     quantity<length, float> l2;
>>>>     l2 = 1.0 * miles; // compile error
>>>>     quantity<length, float> l3 = l1 + l2;
>>>> }
>>>>
>>>> <snip>
>>>
>>> Try static_cast.
>>
>> could you give me an example? That is how should the statement
>>
>>  l2 = 1.0 * miles; // compile error
>>
>> be modified?
>>
>
> l2 = static_cast<quantity<length, float>>(1.0 * miles);

Hmmmm - OK this looks promising, but I get another compiler error with MSVC

1>z:\projects\geflightquest\simulator2\solvecpp\flight.cpp(14) : error 
C2065: 'miles' : undeclared identifier

it looks like I'm missing something;  Here is the test program again - with 
all the headers.

#include <boost/units/systems/si/length.hpp>
#include <boost/units/base_units/us/mile.hpp>
#include <boost/units/quantity.hpp>
int main(int argc, char * argv[]){
    using namespace boost::units;
    using namespace boost::units::si;
    using namespace boost::units::us;
    quantity<length, float> l1;
    l1 = 1.0 * meters;
    quantity<length, float> l2;
    l2 = static_cast<quantity<length, float> >(1.0 * miles);
    quantity<length, float> l3 = l1 + l2;
    return 0;
}

>
> In Christ,
> Steven Watanabe
>
>
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