[Boost-commit] svn:boost r45590 - sandbox/units/libs/units/example

From: boost_at_[hidden]
Date: 2008-05-20 17:30:30

Author: matthiasschabel
Date: 2008-05-20 17:30:29 EDT (Tue, 20 May 2008)
New Revision: 45590
URL: http://svn.boost.org/trac/boost/changeset/45590

Log:
change to use base_unit::unit_type and get_system<>
Text files modified: 
   sandbox/units/libs/units/example/temperature.cpp |    43 ++++++++++++++++++++++++++------------- 
   1 files changed, 29 insertions(+), 14 deletions(-)

Modified: sandbox/units/libs/units/example/temperature.cpp
==============================================================================
--- sandbox/units/libs/units/example/temperature.cpp	(original)
+++ sandbox/units/libs/units/example/temperature.cpp	2008-05-20 17:30:29 EDT (Tue, 20 May 2008)
@@ -20,11 +20,11 @@
 Output:
 @verbatim
 
-{ 32 } F
+{ 32 } °F
 { 273.15 } K
 { 273.15 } K
 { 273.15 } K
-[ 32 ] F
+[ 32 ] °F
 [ 17.7778 ] K
 [ 17.7778 ] K
 [ 17.7778 ] K
@@ -38,6 +38,7 @@
 #include <sstream>
 
 #include <boost/units/absolute.hpp>
+#include <boost/units/get_system.hpp>
 #include <boost/units/io.hpp>
 #include <boost/units/unit.hpp>
 #include <boost/units/quantity.hpp>
@@ -55,9 +56,13 @@
 namespace fahrenheit {
 
 //[temperature_snippet_1
-typedef make_system<boost::units::temperature::fahrenheit_base_unit>::type  system;
-
-typedef unit<temperature_dimension,system>                   temperature;
+// direct method
+//typedef make_system<temperature::fahrenheit_base_unit>::type  system;
+//typedef unit<temperature_dimension,system>                    temperature;
+
+// simpler method for single-unit systems
+typedef temperature::fahrenheit_base_unit::unit_type	temperature;
+typedef get_system<temperature>::type					system;
 
 BOOST_UNITS_STATIC_CONSTANT(degree,temperature);
 BOOST_UNITS_STATIC_CONSTANT(degrees,temperature);
@@ -65,19 +70,29 @@
 
 } // fahrenheit
 
+//template<>
+//struct is_implicitly_convertible<unit<temperature_dimension,fahrenheit::system>,
+//                                 unit<temperature_dimension,si::system> > : 
+//    public mpl::true_
+//{ };
+
+//template<>
+//struct is_implicitly_convertible<
+//    absolute< unit<temperature_dimension,fahrenheit::system> >,
+//    absolute< unit<temperature_dimension,si::system> > > : 
+//    public mpl::true_
+//{ };
+
 //[temperature_snippet_2
 template<>
-struct is_implicitly_convertible<unit<temperature_dimension,fahrenheit::system>,
-                                 unit<temperature_dimension,si::system> > : 
-    public mpl::true_
-{ };
+struct is_implicitly_convertible< 
+           fahrenheit::temperature, 
+		   si::temperature > : public mpl::true_ { };
 
 template<>
-struct is_implicitly_convertible<
-    absolute< unit<temperature_dimension,fahrenheit::system> >,
-    absolute< unit<temperature_dimension,si::system> > > : 
-    public mpl::true_
-{ };
+struct is_implicitly_convertible< 
+           absolute<fahrenheit::temperature>, 
+           absolute<si::temperature> > : public mpl::true_ { };
 //]
 
 } // namespace units