From 9ad0acf37561de9bf359a561faed53de17c2ca3b Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 21 Nov 2012 13:11:43 +0200
Subject: Add dynamic multi-database query support

---
 odb/instance.cxx | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 odb/instance.cxx

(limited to 'odb/instance.cxx')

diff --git a/odb/instance.cxx b/odb/instance.cxx
new file mode 100644
index 0000000..0fc41a7
--- /dev/null
+++ b/odb/instance.cxx
@@ -0,0 +1,74 @@
+// file      : odb/instance.cxx
+// copyright : Copyright (c) 2009-2012 Code Synthesis Tools CC
+// license   : GNU GPL v3; see accompanying LICENSE file
+
+#include <sstream>
+#include <cstdlib>  // abort
+#include <cxxabi.h> // abi::__cxa_demangle
+
+#include <odb/instance.hxx>
+
+using namespace std;
+
+struct demangled_name
+{
+  demangled_name (): s (0), n (0) {}
+  ~demangled_name () {free (s);}
+  char* s;
+  size_t n;
+};
+
+static demangled_name name_;
+
+string entry_base::
+name (type_info const& ti)
+{
+  char*& s (name_.s);
+
+  {
+    int r;
+    s = abi::__cxa_demangle (ti.name (), s, &name_.n, &r);
+
+    if (r != 0)
+      abort (); // We are in static initialization, so this is fatal.
+  }
+
+  string str (s), r;
+
+  // Get the first component. It can be a database kind or name.
+  //
+  string::size_type p (str.find ("::"));
+
+  if (p == string::npos)
+    abort (); // Derived type should be in a namespace.
+
+  string n (str, 0, p);
+
+  // See if it is one of the known kinds.
+  //
+  if (n == "relational")
+  {
+    r = n;
+    p = str.find ("::", 12); // 12 for "relational::"
+    n.assign (str, 12, p == string::npos ? p : p - 12);
+  }
+
+  // See if it is one of the known databases.
+  //
+  database db;
+  istringstream is (n);
+  if (!(is >> db))
+  {
+    if (r.empty ())
+      abort (); // Has to have either kind or database.
+  }
+  else
+  {
+    if (!r.empty ())
+      r += "::";
+
+    r += n;
+  }
+
+  return r;
+}
-- 
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