From ff0e2443f433903b333aae6e9abee7e8dd713fd3 Mon Sep 17 00:00:00 2001
From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Tue, 14 Aug 2018 12:42:01 -0600
Subject: [PATCH] Simplify the initialization of a variety of objects.

---
 include/deal.II/base/parameter_acceptor.h | 2 +-
 include/deal.II/base/parameter_handler.h  | 4 ++--
 include/deal.II/base/timer.h              | 4 ++--
 include/deal.II/numerics/kdtree.h         | 2 +-
 source/numerics/solution_transfer.cc      | 2 +-
 5 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/include/deal.II/base/parameter_acceptor.h b/include/deal.II/base/parameter_acceptor.h
index db438221a6..71546e0689 100644
--- a/include/deal.II/base/parameter_acceptor.h
+++ b/include/deal.II/base/parameter_acceptor.h
@@ -497,7 +497,7 @@ public:
   void
   add_parameter(const std::string &          entry,
                 ParameterType &              parameter,
-                const std::string &          documentation = std::string(),
+                const std::string &          documentation = "",
                 ParameterHandler &           prm_          = prm,
                 const Patterns::PatternBase &pattern =
                   *Patterns::Tools::Convert<ParameterType>::to_pattern());
diff --git a/include/deal.II/base/parameter_handler.h b/include/deal.II/base/parameter_handler.h
index b5b906e9f4..b7ea141f88 100644
--- a/include/deal.II/base/parameter_handler.h
+++ b/include/deal.II/base/parameter_handler.h
@@ -1025,7 +1025,7 @@ public:
   declare_entry(const std::string &          entry,
                 const std::string &          default_value,
                 const Patterns::PatternBase &pattern = Patterns::Anything(),
-                const std::string &          documentation = std::string());
+                const std::string &          documentation = "");
 
   /**
    * Attach an action to the parameter with name @p entry in the current
@@ -1087,7 +1087,7 @@ public:
   void
   add_parameter(const std::string &          entry,
                 ParameterType &              parameter,
-                const std::string &          documentation = std::string(),
+                const std::string &          documentation = "",
                 const Patterns::PatternBase &pattern =
                   *Patterns::Tools::Convert<ParameterType>::to_pattern());
 
diff --git a/include/deal.II/base/timer.h b/include/deal.II/base/timer.h
index 7c9e17be94..1acb5750d2 100644
--- a/include/deal.II/base/timer.h
+++ b/include/deal.II/base/timer.h
@@ -802,13 +802,13 @@ public:
    * is left.
    */
   void
-  leave_subsection(const std::string &section_name = std::string());
+  leave_subsection(const std::string &section_name = "");
 
   /**
    * Same as @p leave_subsection.
    */
   void
-  exit_section(const std::string &section_name = std::string());
+  exit_section(const std::string &section_name = "");
 
   /**
    * Get a map with the collected data of the specified type for each subsection
diff --git a/include/deal.II/numerics/kdtree.h b/include/deal.II/numerics/kdtree.h
index 5cdb6b8ac9..bb8deec461 100644
--- a/include/deal.II/numerics/kdtree.h
+++ b/include/deal.II/numerics/kdtree.h
@@ -86,7 +86,7 @@ public:
    * again, then all following results will likely be wrong.
    */
   KDTree(const unsigned int             max_leaf_size = 10,
-         const std::vector<Point<dim>> &pts = std::vector<Point<dim>>());
+         const std::vector<Point<dim>> &pts           = {});
 
 
   /**
diff --git a/source/numerics/solution_transfer.cc b/source/numerics/solution_transfer.cc
index 9e77a70d0b..bc97775ab0 100644
--- a/source/numerics/solution_transfer.cc
+++ b/source/numerics/solution_transfer.cc
@@ -427,7 +427,7 @@ void
 SolutionTransfer<dim, VectorType, DoFHandlerType>::
   prepare_for_coarsening_and_refinement(const VectorType &in)
 {
-  std::vector<VectorType> all_in = std::vector<VectorType>(1, in);
+  std::vector<VectorType> all_in(1, in);
   prepare_for_coarsening_and_refinement(all_in);
 }
 
-- 
2.39.5