Inject ADOL-C overloads into the std namespace

[[Imported from SVN: r9394]]

dune/gfe/Makefile.am

@@ -5,7 +5,8 @@ SUBDIRS = coupling
 AM_CPPFLAGS = @AM_CPPFLAGS@ -I$(top_srcdir)/..
 
 srcincludedir = $(includedir)/dune/common
-srcinclude_HEADERS = averagedistanceassembler.hh \
+srcinclude_HEADERS = adolcnamespaceinjections.hh \
+                     averagedistanceassembler.hh \
                      averageinterface.hh \
                      cosseratvtkwriter.hh \
                      geodesicdifference.hh \

dune/gfe/adolcnamespaceinjections.hh

+#ifndef DUNE_GFE_ADOLC_NAMESPACE_INJECTIONS_HH
+#define DUNE_GFE_ADOLC_NAMESPACE_INJECTIONS_HH
+
+adouble sqrt_hack(adouble a) {
+  return sqrt(a);
+}
+
+adouble pow_hack(const adouble& a, const adouble& b) {
+    return pow(a,b);
+}
+
+adouble pow_hack(const adouble& a, double b) {
+    return pow(a,b);
+}
+
+namespace std
+{
+   adouble min(adouble a, adouble b) {
+      return fmin(a,b);
+   }
+
+   adouble max(adouble a, adouble b) {
+      return fmax(a,b);
+   }
+
+   adouble sqrt(adouble a) {
+     return sqrt_hack(a);
+   }
+
+   adouble abs(adouble a) {
+     return fabs(a);
+   }
+
+//    adouble fabs(adouble a) {
+//      return fabs(a);
+//    }
+
+   adouble pow(const adouble& a, const adouble& b) {
+     return pow_hack(a,b);
+   }
+
+   adouble pow(const adouble& a, double b) {
+     return pow_hack(a,b);
+   }
+
+   adouble sin(adouble a) {
+     return sin(a);
+   }
+
+   adouble cos(adouble a) {
+     return cos(a);
+   }
+
+   adouble acos(adouble a) {
+     return acos(a);
+   }
+
+   bool isnan(adouble a) {
+     return std::isnan(a.value());
+   }
+
+   bool isinf(adouble a) {
+     return std::isinf(a.value());
+   }
+
+}
+
+#endif
\ No newline at end of file