[io][precision] started work on setting precision. Doesn't work with containers of containers yet.

dumux/io/container.hh

@@ -30,9 +30,12 @@
 #include <iostream>
 #include <fstream>
 #include <iterator>
+#include <iomanip>
+#include <limits>
 
 namespace Dumux {
 
+
 /*!
  * \ingroup InputOutput
  * \brief Writes a container to file
@@ -46,6 +49,8 @@ void writeContainerToFile(const Container& v,
                           const std::string& filename)
 {
     std::ofstream outfile(filename, std::ios::out);
+    outfile << std::scientific;
+    outfile << std::setprecision(std::numeric_limits<typename Container::value_type>::max_digits10+1);
     std::ostream_iterator<typename Container::value_type> it(outfile, "\n");
     std::copy(v.begin(),v.end(), it);
 }

test/io/container/test_container_io.cc

@@ -109,7 +109,7 @@ int main()
     passed = passed && Dumux::testContainerWriter<std::array<int, 2>>({{1, 2}});
     passed = passed && Dumux::testContainerWriter<std::array<std::string, 2>>({{"1.0", "2.0"}});
     passed = passed && Dumux::testContainerWriter<std::array<Dune::FieldVector<double, 3>, 2>>(
-                        std::array<Dune::FieldVector<double, 3>, 2>{{Dune::FieldVector<double, 3>(0.0), Dune::FieldVector<double, 3>(1.0)}});
+                        std::array<Dune::FieldVector<double, 3>, 2>{{Dune::FieldVector<double, 3>(0.0000100012004), Dune::FieldVector<double, 3>(1.12341502e-10)}});
     if (!passed) return 1;
 
     return 0;