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authorBoris Kolpackov <boris@codesynthesis.com>2020-01-28 14:03:36 +0200
committerBoris Kolpackov <boris@codesynthesis.com>2020-01-28 14:03:36 +0200
commit4a326c04d6c59b9236f1129eb139b470cb46ed1e (patch)
tree020c148842306a220b4aeff359be64f26ca9c343
parentdd5fd399ff351a7a1372cdaaeab26b5fcecb14a9 (diff)
Add support for optional C-array as container mapping
-rw-r--r--odb/c-array-traits.hxx102
1 files changed, 102 insertions, 0 deletions
diff --git a/odb/c-array-traits.hxx b/odb/c-array-traits.hxx
new file mode 100644
index 0000000..1acc0d7
--- /dev/null
+++ b/odb/c-array-traits.hxx
@@ -0,0 +1,102 @@
+// file : odb/c-array-traits.hxx
+// copyright : Copyright (c) 2009-2019 Code Synthesis Tools CC
+// license : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef ODB_C_ARRAY_TRAITS_HXX
+#define ODB_C_ARRAY_TRAITS_HXX
+
+#include <odb/pre.hxx>
+
+#include <cstddef> // std::size_t
+#include <cassert>
+
+#include <odb/container-traits.hxx>
+
+namespace odb
+{
+ // Optional mapping of C arrays as containers. Note that this mapping is not
+ // enable by default. To enable, pass the following options to the ODB
+ // compiler:
+ //
+ // --odb-epilogue '#include <odb/c-array-traits.hxx>'
+ // --hxx-prologue '#include <odb/c-array-traits.hxx>'
+ //
+ // Note also that the array types have to be named, for example:
+ //
+ // class object
+ // {
+ // // composite_type values[5]; // Won't work.
+ //
+ // typedef composite_type composite_array[5];
+ // composite_array values;
+ // };
+ //
+ // Finally, this mapping is disabled for the char[N] and wchar_t[N] types
+ // (they are mapped as strings by default).
+ //
+ template <typename V, std::size_t N>
+ class access::container_traits<V[N]>
+ {
+ public:
+ static const container_kind kind = ck_ordered;
+ static const bool smart = false;
+
+ typedef V container_type[N];
+
+ typedef V value_type;
+ typedef std::size_t index_type;
+
+ typedef ordered_functions<index_type, value_type> functions;
+
+ public:
+ static void
+ persist (const container_type& c, const functions& f)
+ {
+ for (index_type i (0); i < N; ++i)
+ f.insert (i, c[i]);
+ }
+
+ static void
+ load (container_type& c, bool more, const functions& f)
+ {
+ index_type i (0);
+
+ for (; more && i < N; ++i)
+ {
+ index_type dummy;
+ more = f.select (dummy, c[i]);
+ }
+
+ assert (!more && i == N);
+ }
+
+ static void
+ update (const container_type& c, const functions& f)
+ {
+ f.delete_ ();
+
+ for (index_type i (0); i < N; ++i)
+ f.insert (i, c[i]);
+ }
+
+ static void
+ erase (const functions& f)
+ {
+ f.delete_ ();
+ }
+ };
+
+ // Disable for char[N] and wchar_t[N].
+ //
+ template <std::size_t N>
+ class access::container_traits<char[N]>;
+
+#ifdef _WIN32
+ template <std::size_t N>
+ class access::container_traits<wchar_t[N]>;
+#endif
+}
+
+#include <odb/post.hxx>
+
+#endif // ODB_C_ARRAY_TRAITS_HXX