From 54d789204fec8478eedd936f9a6d10e4ce5d13dd Mon Sep 17 00:00:00 2001
From: Antonin Portelli <antonin.portelli@me.com>
Date: Mon, 7 May 2018 21:17:46 +0100
Subject: [PATCH] more general implementation of the precision interface for
 serialisers

---
 lib/serialisation/BaseIO.h | 32 +++++++++++++++++++++++++++++++-
 lib/serialisation/XmlIO.h  | 11 +++++++++--
 2 files changed, 40 insertions(+), 3 deletions(-)

diff --git a/lib/serialisation/BaseIO.h b/lib/serialisation/BaseIO.h
index bc178e0d..dd15e7da 100644
--- a/lib/serialisation/BaseIO.h
+++ b/lib/serialisation/BaseIO.h
@@ -60,8 +60,14 @@ namespace Grid {
     void write(const std::string &s, const iVector<U, N> &output);
     template <typename U, int N>
     void write(const std::string &s, const iMatrix<U, N> &output);
+    void         scientificFormat(const bool set);
+    bool         isScientific(void);
+    void         setPrecision(const unsigned int prec);
+    unsigned int getPrecision(void);
   private:
-    T *upcast;
+    T            *upcast;
+    bool         scientific_{false};
+    unsigned int prec_{0};
   };
   
   // Static abstract reader
@@ -155,6 +161,30 @@ namespace Grid {
   {
     upcast->writeDefault(s, tensorToVec(output));
   }
+
+  template <typename T>
+  void Writer<T>::scientificFormat(const bool set)
+  {
+    scientific_ = set;
+  }
+
+  template <typename T>
+  bool Writer<T>::isScientific(void)
+  {
+    return scientific_;
+  }
+
+  template <typename T>
+  void Writer<T>::setPrecision(const unsigned int prec)
+  {
+    prec_ = prec;
+  }
+
+  template <typename T>
+  unsigned int Writer<T>::getPrecision(void)
+  {
+    return prec_;
+  }
   
   // Reader template implementation
   template <typename T>
diff --git a/lib/serialisation/XmlIO.h b/lib/serialisation/XmlIO.h
index 792505d4..17ccb32e 100644
--- a/lib/serialisation/XmlIO.h
+++ b/lib/serialisation/XmlIO.h
@@ -103,8 +103,15 @@ namespace Grid
   {
     std::ostringstream os;
     
-    os.precision(16);
-    os << std::scientific << std::boolalpha << x;
+    if (getPrecision())
+    {
+      os.precision(getPrecision());
+    }
+    if (isScientific())
+    {
+      os << std::scientific;
+    }
+    os << std::boolalpha << x;
     pugi::xml_node leaf = node_.append_child(s.c_str());
     leaf.append_child(pugi::node_pcdata).set_value(os.str().c_str());
   }