4 files changed, 17 insertions, 3 deletions
diff --git a/lib/form.cpp b/lib/form.cpp
index 778e5d3..ef9703a 100644
--- a/lib/form.cpp
+++ b/lib/form.cpp

@@ -33,7 +33,12 @@ namespace verbly {
  {
    return (form::lemmaJoin %= (joinCondition && (form::inflectionCategory == check.getCategory())));
  }
-  
+  form::inflection_field::operator filter() const
+  {
+    return (form::lemmaJoin %= (form::inflectionCategory == category_));
+  }
  const std::vector<pronunciation>& form::getPronunciations() const
  {
    if (!valid_)
diff --git a/lib/form.h b/lib/form.h
index c9c2a9e..aca5b2f 100644
--- a/lib/form.h
+++ b/lib/form.h

@@ -117,7 +117,9 @@ namespace verbly {
      {
        return category_;
      }
-      
+      operator filter() const;
    private:
      const inflection category_;
diff --git a/lib/lemma.cpp b/lib/lemma.cpp
index f9e9fcc..7fdc360 100644
--- a/lib/lemma.cpp
+++ b/lib/lemma.cpp

@@ -21,6 +21,11 @@ namespace verbly {
    return (lemma::formJoin %= joinCondition) && (lemma::inflectionCategory == check.getCategory());
  }
  
+  lemma::inflection_field::operator filter() const
+  {
+    return (lemma::inflectionCategory == category_);
+  }
+  
  lemma::lemma(const database& db, sqlite3_stmt* row) : db_(&db), valid_(true)
  {
    id_ = sqlite3_column_int(row, 0);
diff --git a/lib/lemma.h b/lib/lemma.h
index 9a07f16..8c8d1c1 100644
--- a/lib/lemma.h
+++ b/lib/lemma.h

@@ -6,6 +6,7 @@
 #include <list>
 #include <map>
 #include "field.h"
+#include "form.h"
 #include "enums.h"
 #include "filter.h"
@@ -13,7 +14,6 @@ struct sqlite3_stmt;
 namespace verbly {
  
-  class form;
  class database;
  
  class lemma {
@@ -86,6 +86,8 @@ namespace verbly {
        return category_;
      }
      
+      operator filter() const;
+      
    private:
      
      const inflection category_;