Date: Friday, January 27, 2006 @ 12:48:25
Author: marc
Path: /cvsroot/carob/carob/src
Modified: ParameterStatement.cpp (1.9 -> 1.10)
Reworked template setters to add a "oneShotFilter()". Needed to catch infinity
and NotaNumbers. CAROB-31 CAROB-55
------------------------+
ParameterStatement.cpp | 59 +++++++++++++++++++++++++++++++++++------------
1 files changed, 45 insertions(+), 14 deletions(-)
Index: carob/src/ParameterStatement.cpp
diff -u carob/src/ParameterStatement.cpp:1.9
carob/src/ParameterStatement.cpp:1.10
--- carob/src/ParameterStatement.cpp:1.9 Thu Jan 26 22:21:28 2006
+++ carob/src/ParameterStatement.cpp Fri Jan 27 12:48:24 2006
@@ -139,30 +139,59 @@
std::locale locC = std::locale::classic();
}
+
+ ///// Template & specialized filters /////
+
namespace CarobNS {
using std::basic_ostream;
+ /// template filters do nothing by default ///
+
+/**
+ * Stream filter: intercept (only) one value, modify it before printing it,
and returns the
+ * filtered stream before disappearing.
+ */
+template <class T, class Ch>
+class oneShotFilter
+{
+ basic_ostream<Ch>& wrapped_stream;
+public:
+ oneShotFilter(basic_ostream<Ch>& s) : wrapped_stream(s) { } ;
+ basic_ostream<Ch>&
+ // this is the actual filtering operator
+ operator<< (T value)
+ { // by default filter nothing, just output the value
+ wrapped_stream << value;
+ // then return the underlying stream (we filter only once!)
+ return wrapped_stream;
+ }
+};
-// Template<datatype> stream manipulators
-// No pointer to function template (type safety?), so let's do a functor
template <class T, class Ch = wchar_t>
-class streamSettingsFor
+class streamSettings
{
public:
- void doManip(basic_ostream<Ch>& s) const { };
+ void doManip(basic_ostream<Ch>& s) const { /* do nothing by default */ };
};
-// stream operator<< for the functor just above
+/**
+ * Operator<< doing the actual filtering work: modify the settings
+ * of the underlying standard stream, then returns a one-shot filter.
+ */
template <class T, class Ch>
-basic_ostream<Ch>&
-operator<< (basic_ostream<Ch>& s, streamSettingsFor<T, Ch> m)
+oneShotFilter<T, Ch>
+operator<< (basic_ostream<Ch>& filtered_std_stream, const streamSettings<T,
Ch>& setfunctor)
{
- m.doManip(s);
- return s;
+ // modify settings of underlying stream
+ setfunctor.doManip(filtered_std_stream);
+ // then return a filter instance
+ return oneShotFilter<T, Ch>(filtered_std_stream);
}
-// partial specialization code shared by float & double
+ ///// Filter specializations ////
+
+// Partial specialization code shared by float & double
template<class Ch> void
streamSettingsForFloatingPoint(basic_ostream<Ch>& s)
{
@@ -172,7 +201,7 @@
// template specialization for float
template<class Ch>
-class streamSettingsFor<float, Ch>
+class streamSettings<float, Ch>
{
public:
void doManip(basic_ostream<Ch>& s) const
@@ -182,9 +211,9 @@
};
};
-// template specialization for float
+// template specialization for double
template<class Ch>
-class streamSettingsFor<double, Ch>
+class streamSettings<double, Ch>
{
public:
void doManip(basic_ostream<Ch>& s) const
@@ -196,6 +225,8 @@
} // namespace CarobNS
+ //// end of template filters ////
+
template <class T> void ParameterStatement::set(const int paramIndex, const
std::wstring &typeTag,
const T& value)
@@ -210,7 +241,7 @@
// TODO: catch inf & NaN
- buffer << START_PARAM_TAG << typeTag << streamSettingsFor<T>() << value <<
END_PARAM_TAG;
+ buffer << START_PARAM_TAG << typeTag << streamSettings<T>() << value <<
END_PARAM_TAG;
inStrings[paramIndex-1] = buffer.str();
}
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