Prefer = default for default ctors and dtors

Change-Id: I6ef86691902be8d4dfea14b029e4aa59be982854
diff --git a/src/ast_path.cpp b/src/ast_path.cpp
index 8a41279..f107cca 100644
--- a/src/ast_path.cpp
+++ b/src/ast_path.cpp
@@ -159,9 +159,7 @@
 }
 }
 
-schemaPath_::schemaPath_()
-{
-}
+schemaPath_::schemaPath_() = default;
 
 schemaPath_::schemaPath_(const Scope scope, const std::vector<schemaNode_>& nodes, const TrailingSlash trailingSlash)
     : m_scope(scope)
@@ -178,9 +176,7 @@
     return this->m_nodes == b.m_nodes;
 }
 
-dataPath_::dataPath_()
-{
-}
+dataPath_::dataPath_() = default;
 
 dataPath_::dataPath_(const Scope scope, const std::vector<dataNode_>& nodes, const TrailingSlash trailingSlash)
     : m_scope(scope)