cmDocumentation: Get rid of raw pointers in AllSections map

Also simplify a lot of logic around adding sections into it.
Prefer move sematics over references.

Source/cmDocumentation.cxx

@@ -2,7 +2,6 @@
    file Copyright.txt or https://cmake.org/licensing for details.  */
 #include "cmDocumentation.h"
 
-#include "cmAlgorithms.h"
 #include "cmDocumentationEntry.h"
 #include "cmDocumentationSection.h"
 #include "cmRST.h"
@@ -55,11 +54,6 @@ cmDocumentation::cmDocumentation()
   this->ShowGenerators = true;
 }
 
-cmDocumentation::~cmDocumentation()
-{
-  cmDeleteAll(this->AllSections);
-}
-
 bool cmDocumentation::PrintVersion(std::ostream& os)
 {
   /* clang-format off */
@@ -174,20 +168,16 @@ void cmDocumentation::WarnFormFromFilename(
 
 void cmDocumentation::addCommonStandardDocSections()
 {
-  cmDocumentationSection* sec;
+  cmDocumentationSection sec{ "Options" };
-
+  sec.Append(cmDocumentationStandardOptions);
-  sec = new cmDocumentationSection("Options");
+  this->AllSections.emplace("Options", std::move(sec));
-  sec->Append(cmDocumentationStandardOptions);
-  this->AllSections["Options"] = sec;
 }
 
 void cmDocumentation::addCMakeStandardDocSections()
 {
-  cmDocumentationSection* sec;
+  cmDocumentationSection sec{ "Generators" };
-
+  sec.Append(cmDocumentationGeneratorsHeader);
-  sec = new cmDocumentationSection("Generators");
+  this->AllSections.emplace("Generators", std::move(sec));
-  sec->Append(cmDocumentationGeneratorsHeader);
-  this->AllSections["Generators"] = sec;
 }
 
 void cmDocumentation::addCTestStandardDocSections()
@@ -199,11 +189,7 @@ void cmDocumentation::addCTestStandardDocSections()
 
 void cmDocumentation::addCPackStandardDocSections()
 {
-  cmDocumentationSection* sec;
+  addCMakeStandardDocSections();
-
-  sec = new cmDocumentationSection("Generators");
-  sec->Append(cmDocumentationGeneratorsHeader);
-  this->AllSections["Generators"] = sec;
 }
 
 bool cmDocumentation::CheckOptions(int argc, const char* const* argv,
@@ -364,85 +350,59 @@ void cmDocumentation::SetName(const std::string& name)
 }
 
 void cmDocumentation::SetSection(const char* name,
-                                 cmDocumentationSection* section)
+                                 cmDocumentationSection section)
 {
-  if (this->AllSections.find(name) != this->AllSections.end()) {
+  this->SectionAtName(name) = std::move(section);
-    delete this->AllSections[name];
-  }
-  this->AllSections[name] = section;
 }
 
 void cmDocumentation::SetSection(const char* name,
                                  std::vector<cmDocumentationEntry>& docs)
 {
-  cmDocumentationSection* sec = new cmDocumentationSection(name);
+  cmDocumentationSection sec{ name };
-  sec->Append(docs);
+  sec.Append(docs);
-  this->SetSection(name, sec);
+  this->SetSection(name, std::move(sec));
 }
 
 void cmDocumentation::SetSection(const char* name, const char* docs[][2])
 {
-  cmDocumentationSection* sec = new cmDocumentationSection(name);
+  cmDocumentationSection sec{ name };
-  sec->Append(docs);
+  sec.Append(docs);
-  this->SetSection(name, sec);
+  this->SetSection(name, std::move(sec));
 }
 
 void cmDocumentation::SetSections(
-  std::map<std::string, cmDocumentationSection*>& sections)
+  std::map<std::string, cmDocumentationSection> sections)
 {
-  for (auto const& s : sections) {
+  for (auto& s : sections) {
-    this->SetSection(s.first.c_str(), s.second);
+    this->SetSection(s.first.c_str(), std::move(s.second));
   }
 }
+cmDocumentationSection& cmDocumentation::SectionAtName(const char* name)
+{
+  return this->AllSections.emplace(name, cmDocumentationSection{ name })
+    .first->second;
+}
 
 void cmDocumentation::PrependSection(const char* name, const char* docs[][2])
 {
-  cmDocumentationSection* sec = nullptr;
+  this->SectionAtName(name).Prepend(docs);
-  if (this->AllSections.find(name) == this->AllSections.end()) {
-    sec = new cmDocumentationSection(name);
-    this->SetSection(name, sec);
-  } else {
-    sec = this->AllSections[name];
-  }
-  sec->Prepend(docs);
 }
 
 void cmDocumentation::PrependSection(const char* name,
                                      std::vector<cmDocumentationEntry>& docs)
 {
-  cmDocumentationSection* sec = nullptr;
+  this->SectionAtName(name).Prepend(docs);
-  if (this->AllSections.find(name) == this->AllSections.end()) {
-    sec = new cmDocumentationSection(name);
-    this->SetSection(name, sec);
-  } else {
-    sec = this->AllSections[name];
-  }
-  sec->Prepend(docs);
 }
 
 void cmDocumentation::AppendSection(const char* name, const char* docs[][2])
 {
-  cmDocumentationSection* sec = nullptr;
+  this->SectionAtName(name).Append(docs);
-  if (this->AllSections.find(name) == this->AllSections.end()) {
-    sec = new cmDocumentationSection(name);
-    this->SetSection(name, sec);
-  } else {
-    sec = this->AllSections[name];
-  }
-  sec->Append(docs);
 }
 
 void cmDocumentation::AppendSection(const char* name,
                                     std::vector<cmDocumentationEntry>& docs)
 {
-  cmDocumentationSection* sec = nullptr;
+  this->SectionAtName(name).Append(docs);
-  if (this->AllSections.find(name) == this->AllSections.end()) {
-    sec = new cmDocumentationSection(name);
-    this->SetSection(name, sec);
-  } else {
-    sec = this->AllSections[name];
-  }
-  sec->Append(docs);
 }
 
 void cmDocumentation::AppendSection(const char* name,
@@ -625,11 +585,10 @@ bool cmDocumentation::PrintHelpListPolicies(std::ostream& os)
 
 bool cmDocumentation::PrintHelpListGenerators(std::ostream& os)
 {
-  std::map<std::string, cmDocumentationSection*>::iterator si;
+  const auto si = this->AllSections.find("Generators");
-  si = this->AllSections.find("Generators");
   if (si != this->AllSections.end()) {
     this->Formatter.SetIndent("  ");
-    this->Formatter.PrintSection(os, *si->second);
+    this->Formatter.PrintSection(os, si->second);
   }
   return true;
 }
@@ -655,29 +614,27 @@ bool cmDocumentation::PrintHelpListVariables(std::ostream& os)
 
 bool cmDocumentation::PrintUsage(std::ostream& os)
 {
-  std::map<std::string, cmDocumentationSection*>::iterator si;
+  const auto si = this->AllSections.find("Usage");
-  si = this->AllSections.find("Usage");
   if (si != this->AllSections.end()) {
-    this->Formatter.PrintSection(os, *si->second);
+    this->Formatter.PrintSection(os, si->second);
   }
   return true;
 }
 
 bool cmDocumentation::PrintHelp(std::ostream& os)
 {
-  std::map<std::string, cmDocumentationSection*>::iterator si;
+  auto si = this->AllSections.find("Usage");
-  si = this->AllSections.find("Usage");
   if (si != this->AllSections.end()) {
-    this->Formatter.PrintSection(os, *si->second);
+    this->Formatter.PrintSection(os, si->second);
   }
   si = this->AllSections.find("Options");
   if (si != this->AllSections.end()) {
-    this->Formatter.PrintSection(os, *si->second);
+    this->Formatter.PrintSection(os, si->second);
   }
   if (this->ShowGenerators) {
     si = this->AllSections.find("Generators");
     if (si != this->AllSections.end()) {
-      this->Formatter.PrintSection(os, *si->second);
+      this->Formatter.PrintSection(os, si->second);
     }
   }
   return true;

Source/cmDocumentation.h

@@ -6,13 +6,13 @@
 #include "cmConfigure.h" // IWYU pragma: keep
 
 #include "cmDocumentationFormatter.h"
+#include "cmDocumentationSection.h"
 
 #include <iosfwd>
 #include <map>
 #include <string>
 #include <vector>
 
-class cmDocumentationSection;
 struct cmDocumentationEntry;
 
 /** Class to generate documentation.  */
@@ -21,8 +21,6 @@ class cmDocumentation : public cmDocumentationEnums
 public:
   cmDocumentation();
 
-  ~cmDocumentation();
-
   /**
    * Check command line arguments for documentation options.  Returns
    * true if documentation options are found, and false otherwise.
@@ -52,11 +50,11 @@ public:
 
   /** Set a section of the documentation. Typical sections include Name,
       Usage, Description, Options */
-  void SetSection(const char* sectionName, cmDocumentationSection* section);
+  void SetSection(const char* sectionName, cmDocumentationSection section);
   void SetSection(const char* sectionName,
                   std::vector<cmDocumentationEntry>& docs);
   void SetSection(const char* sectionName, const char* docs[][2]);
-  void SetSections(std::map<std::string, cmDocumentationSection*>& sections);
+  void SetSections(std::map<std::string, cmDocumentationSection> sections);
 
   /** Add the documentation to the beginning/end of the section */
   void PrependSection(const char* sectionName, const char* docs[][2]);
@@ -110,7 +108,8 @@ private:
   bool ShowGenerators;
 
   std::string NameString;
-  std::map<std::string, cmDocumentationSection*> AllSections;
+  std::map<std::string, cmDocumentationSection> AllSections;
+  cmDocumentationSection& SectionAtName(const char* name);
 
   std::string CurrentArgument;