Boost C++ Libraries

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Struct template conversion_helper

boost::units::conversion_helper

Synopsis

// In header: <boost/units/conversion.hpp>

template<typename From, typename To> 
struct conversion_helper {

  // public static functions
  static To convert(const From &);
};

Description

Template for defining conversions between quantities. This template should be specialized for every quantity that allows conversions. For example, if you have a two units called pair and dozen you would write

 namespace boost {
 namespace units {
 template<class T0, class T1>
 struct conversion_helper<quantity<dozen, T0>, quantity<pair, T1> >
 {
     static quantity<pair, T1> convert(const quantity<dozen, T0>& source)
     {
         return(quantity<pair, T1>::from_value(6 * source.value()));
     }
 };
 }
 }

In most cases, the predefined specializations for unit and absolute should be sufficient, so users should rarely need to use this.

`conversion_helper` public static functions

```
static To convert(const From &);
```