Implement {query,execute}_{one,value}() shortcut functions

Useful in situations where the query is know to return at most one element
(*_one) or exactly one element (*_value).

1 files changed, 19 insertions, 0 deletions

diff --git a/odb/result.hxx b/odb/result.hxx
index 93c0dce..5f84342 100644
--- a/odb/result.hxx
+++ b/odb/result.hxx
@@ -209,6 +209,23 @@ namespace odb
       return impl_ ? impl_->size () : 0;
     }
 
+    // query_one() and query_value() implementation details.
+    //
+  public:
+    typename object_traits<T>::pointer_type
+    one ();
+
+    bool
+    one (T&);
+
+    // We cannot return by value here since result can be instantiated
+    // for an abstract type (polymorphic abstract base) and it seems
+    // the signature must be valid to the point being able to call the
+    // necessary constructors.
+    //
+    void
+    value (T&);
+
   private:
     friend class result<const T>;
 
@@ -222,6 +239,8 @@ namespace odb
   }
 }
 
+#include <odb/result.txx>
+
 #include <odb/post.hxx>
 
 #endif // ODB_RESULT_HXX