Setup project database infrastructure

1 files changed, 82 insertions, 0 deletions

diff --git a/bdep/database.hxx b/bdep/database.hxx
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+// file      : bdep/database.hxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef BDEP_DATABASE_HXX
+#define BDEP_DATABASE_HXX
+
+#include <type_traits> // remove_reference
+
+#include <odb/query.hxx>
+#include <odb/result.hxx>
+#include <odb/session.hxx>
+
+#include <odb/sqlite/database.hxx>
+
+#include <bdep/types.hxx>
+#include <bdep/utility.hxx>
+
+#include <bdep/diagnostics.hxx>
+
+namespace bdep
+{
+  using odb::query;
+  using odb::result;
+  using odb::session;
+
+  using odb::sqlite::database;
+  using odb::sqlite::transaction;
+
+  database
+  open (const dir_path& project, tracer&, bool create = false);
+
+  struct tracer_guard
+  {
+    tracer_guard (database& db, tracer& t)
+        : db_ (db), t_ (db.tracer ()) {db.tracer (t);}
+    ~tracer_guard () {db_.tracer (*t_);}
+
+  private:
+    database& db_;
+    odb::tracer* t_;
+  };
+
+  // Range-based for-loop iteration over query result that returns object
+  // pointers. For example:
+  //
+  // for (shared_ptr<object> o: pointer_result (db.query<object> (...)))
+  //
+  template <typename R>
+  class pointer_result_range
+  {
+    R r_;
+
+  public:
+    pointer_result_range (R&& r): r_ (forward<R> (r)) {}
+
+    using base_iterator = typename std::remove_reference<R>::type::iterator;
+
+    struct iterator: base_iterator
+    {
+      iterator () = default;
+
+      explicit
+      iterator (base_iterator i): base_iterator (move (i)) {}
+
+      typename base_iterator::pointer_type
+      operator* () {return this->load ();}
+    };
+
+    iterator begin () {return iterator (r_.begin ());}
+    iterator end () {return iterator (r_.end ());}
+  };
+
+  template <typename R>
+  inline pointer_result_range<R>
+  pointer_result (R&& r)
+  {
+    return pointer_result_range<R> (forward<R> (r));
+  }
+}
+
+#endif // BDEP_DATABASE_HXX