[Boost-sandbox-cvs] boost-sandbox/boost/math/tools precision.hpp, 1.1.2.10, 1.1.2.11

[Paul A B. <pbr...@us...>]

Update of /cvsroot/boost-sandbox/boost-sandbox/boost/math/tools
In directory sc8-pr-cvs3.sourceforge.net:/tmp/cvs-serv18818/boost-sandbox/boost/math/tools

Modified Files:
      Tag: math_toolkit
	precision.hpp 
Log Message:
Aded comments

Index: precision.hpp
===================================================================
RCS file: /cvsroot/boost-sandbox/boost-sandbox/boost/math/tools/Attic/precision.hpp,v
retrieving revision 1.1.2.10
retrieving revision 1.1.2.11
diff -u -d -r1.1.2.10 -r1.1.2.11
--- precision.hpp	19 Mar 2007 18:48:49 -0000	1.1.2.10
+++ precision.hpp	28 Mar 2007 11:46:08 -0000	1.1.2.11
@@ -20,6 +20,17 @@
 {
 namespace tools
 {
+// If T is not specialized, the functions digits, max_value and min_value,
+// all get synthesised automatically from std::numeric_limits.
+// However, if numeric_limits is not specialised for type RealType,
+// for example with NTL::RR type, then you will get a compiler error
+// when code tries to use these functions, unless you explicitly specialise them.
+
+// For example if the precision of RealType varies at runtime,
+// then numeric_limits support may not be appropriate,
+// see boost/math/tools/ntl.hpp  for examples like
+// template <> NTL::RR max_value<NTL::RR> ...
+// See  Conceptual Requirements for Real Number Types.
 
 template <class T>
 inline int digits(BOOST_EXPLICIT_TEMPLATE_TYPE(T))