[Boost-commit] svn:boost r41728 - sandbox/units/libs/units/doc

From: steven_at_[hidden]
Date: 2007-12-04 19:33:22

Author: steven_watanabe
Date: 2007-12-04 19:33:21 EST (Tue, 04 Dec 2007)
New Revision: 41728
URL: http://svn.boost.org/trac/boost/changeset/41728

Log:
Fixed description of BOOST_UNITS_DEFINE_BASE_CONVERSION
Text files modified: 
   sandbox/units/libs/units/doc/units.qbk |    10 +++++++---                              
   1 files changed, 7 insertions(+), 3 deletions(-)

Modified: sandbox/units/libs/units/doc/units.qbk
==============================================================================
--- sandbox/units/libs/units/doc/units.qbk	(original)
+++ sandbox/units/libs/units/doc/units.qbk	2007-12-04 19:33:21 EST (Tue, 04 Dec 2007)
@@ -423,9 +423,13 @@
 
 For most purposes [___BOOST_UNITS_DEFINE_BASE_CONVERSION] will be
 sufficient.  It defines a conversion between two base units with
-the same dimensions.  If you define use different dimensions for
-defining base units then you will need to use the more general form
-[___BOOST_UNITS_DEFINE_CONVERSION] which works for arbitrary units.
+the same dimensions.  If you need to use different set of
+dimensions when defining base units then you will
+need to use the more general form [___BOOST_UNITS_DEFINE_CONVERSION]
+which works for arbitrary units.  Example:  If you are using SI
+and want to define mmHg you cannot do it using [___BOOST_UNITS_DEFINE_BASE_CONVERSION]
+because none of the SI base units has the same dimensions (pressure).
+You need to use [___BOOST_UNITS_DEFINE_CONVERSION](mmHg_base_unit, SI::pressure, ..., ...)
 
 If you need to define a conversion as a template then
 you can add _TEMPLATE onto the end of any of the macros.