Re: [boost] [units] problems

14 Sep 2013

      Robert Ramey wrote:
...
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 l1;
    l1 = 1000.0 * meters;
    quantity l2;
    l2 = 1.0 * miles; // compile error
    quantity 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>(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 
#include 
#include 
int main(int argc, char * argv[]){
   using namespace boost::units;
   using namespace boost::units::si;
   using namespace boost::units::us;
   quantity l1;
   l1 = 1.0 * meters;
   quantity l2;
   l2 = static_cast >(1.0 * miles);
   quantity l3 = l1 + l2;
   return 0;
}
OK my latest attempt just adds the following:

namespace boost { namespace units { namespace us {
  BOOST_UNITS_STATIC_CONSTANT(miles, mile_base_unit);
} } }

But this generates an error with MSVC (and a similar message with gcc)

1>z:\projects\geflightquest\simulator2\solvecpp\flight.cpp(18) : error 
C2678: binary '*' : no operator found which takes a left-hand operand of 
type 'double' (or there is no acceptable conversion)
1> z:\boost_1_54_0\boost\units\detail\one.hpp(47): could be 'T 
boost::units::operator *boost::units::us::mile_base_unit(const 
boost::units::one &,const T &)'
1> with
1> [
1> T=boost::units::us::mile_base_unit
1> ]
1> z:\boost_1_54_0\boost\units\detail\one.hpp(53): or 'T 
boost::units::operator *<double>(const T &,const boost::units::one &)'
1> with
1> [
1> T=double
1> ]
1> z:\boost_1_54_0\boost\units\detail\one.hpp(58): or 'boost::units::one 
boost::units::operator *(const boost::units::one &,const boost::units::one 
&)'
1> while trying to match the argument list '(double, const 
boost::units::us::mile_base_unit)'

I went back and tried to compile the tutorial - and it failed in the same
circumstance with the same message.  I tried this with current release 
branch
and version 1.54 .  I'm pretty much at loss here.  I can't believe that I'm 
the
first person to have this problem.

Any help appreciated

Robert Ramey
...
...
In Christ,
Steven Watanabe
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