From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Wed, 21 Jun 2023 15:38:25 +0000 (-0600)
Subject: Standardize on the idiom of calling std::erase after std::unique.
X-Git-Tag: relicensing~855^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ce4c56920043cea0ad1b8f27f0e3ef365ca3ca47;p=dealii.git

Standardize on the idiom of calling std::erase after std::unique.

This idiom is used in many other places. This patch changes a number of locations
where we do the same thing but instead use a different idiom, using a temporary
iterator and/or using resize() instead of erase().
---

diff --git a/include/deal.II/lac/affine_constraints.templates.h b/include/deal.II/lac/affine_constraints.templates.h
index f385c04284..1ad3527835 100644
--- a/include/deal.II/lac/affine_constraints.templates.h
+++ b/include/deal.II/lac/affine_constraints.templates.h
@@ -1326,9 +1326,7 @@ AffineConstraints<number>::resolve_indices(
 
   // keep only the unique elements
   std::sort(indices.begin(), indices.end());
-  std::vector<types::global_dof_index>::iterator it;
-  it = std::unique(indices.begin(), indices.end());
-  indices.resize(it - indices.begin());
+  indices.erase(std::unique(indices.begin(), indices.end()), indices.end());
 }
 
 
diff --git a/source/base/parsed_convergence_table.cc b/source/base/parsed_convergence_table.cc
index 5c4f15b802..c27523bbd7 100644
--- a/source/base/parsed_convergence_table.cc
+++ b/source/base/parsed_convergence_table.cc
@@ -26,8 +26,8 @@ namespace
   get_unique_component_names(const std::vector<std::string> &component_names)
   {
     auto elements = component_names;
-    auto last     = std::unique(elements.begin(), elements.end());
-    elements.resize(last - elements.begin());
+    elements.erase(std::unique(elements.begin(), elements.end()),
+                   elements.end());
     return elements;
   }
 
diff --git a/source/lac/sparsity_tools.cc b/source/lac/sparsity_tools.cc
index 0d0087cb73..013bbfe5af 100644
--- a/source/lac/sparsity_tools.cc
+++ b/source/lac/sparsity_tools.cc
@@ -641,10 +641,9 @@ namespace SparsityTools
         std::sort(next_round_dofs.begin(), next_round_dofs.end());
 
         // delete multiple entries
-        std::vector<DynamicSparsityPattern::size_type>::iterator end_sorted;
-        end_sorted =
-          std::unique(next_round_dofs.begin(), next_round_dofs.end());
-        next_round_dofs.erase(end_sorted, next_round_dofs.end());
+        next_round_dofs.erase(std::unique(next_round_dofs.begin(),
+                                          next_round_dofs.end()),
+                              next_round_dofs.end());
 
         // eliminate dofs which are already numbered
         for (int s = next_round_dofs.size() - 1; s >= 0; --s)